source: trunk/source/lisp-kernel/thread_manager.c @ 12798

Last change on this file since 12798 was 12798, checked in by gb, 10 years ago

Don't copy a thread's termination semaphore to the TCR (so don't
signal it in the last stages of thread termination, possibly after
the lisp pointer to the semaphore has been GCed.)

Do try to signal it from lisp code, at least in cases where the thread
terminates normally (in PROCESS-INITIAL-FORM-EXITED).

Seems to fix ticket:598.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 58.1 KB
Line 
1/*
2   Copyright (C) 1994-2001 Digitool, Inc
3   This file is part of OpenMCL. 
4
5   OpenMCL is licensed under the terms of the Lisp Lesser GNU Public
6   License , known as the LLGPL and distributed with OpenMCL as the
7   file "LICENSE".  The LLGPL consists of a preamble and the LGPL,
8   which is distributed with OpenMCL as the file "LGPL".  Where these
9   conflict, the preamble takes precedence. 
10
11   OpenMCL is referenced in the preamble as the "LIBRARY."
12
13   The LLGPL is also available online at
14   http://opensource.franz.com/preamble.html
15*/
16
17
18#include "Threads.h"
19
20
21typedef struct {
22  TCR *tcr;
23  natural vsize, tsize;
24  void *created;
25} thread_activation;
26
27#ifdef HAVE_TLS
28__thread char tcrbuf[sizeof(TCR)+16];
29__thread TCR *current_tcr;
30#endif
31
32/* This is set to true when running a 32-bit Lisp on 64-bit FreeBSD */
33Boolean rcontext_readonly = false;
34
35extern natural
36store_conditional(natural*, natural, natural);
37
38extern signed_natural
39atomic_swap(signed_natural*, signed_natural);
40
41#ifdef USE_FUTEX
42#define futex_wait(futex,val) syscall(SYS_futex,futex,FUTEX_WAIT,val)
43#define futex_wake(futex,n) syscall(SYS_futex,futex,FUTEX_WAKE,n)
44#define FUTEX_AVAIL (0)
45#define FUTEX_LOCKED (1)
46#define FUTEX_CONTENDED (2)
47#endif
48
49#ifdef WINDOWS
50extern pc spentry_start, spentry_end,subprims_start,subprims_end;
51extern pc restore_windows_context_start, restore_windows_context_end,
52  restore_windows_context_iret;
53
54
55extern void interrupt_handler(int, siginfo_t *, ExceptionInformation *);
56
57void CALLBACK
58nullAPC(ULONG_PTR arg) 
59{
60}
61 
62BOOL (*pCancelIoEx)(HANDLE, OVERLAPPED*) = NULL;
63BOOL (*pCancelSynchronousIo)(HANDLE) = NULL;
64
65
66
67extern void *windows_find_symbol(void*, char*);
68
69int
70raise_thread_interrupt(TCR *target)
71{
72  /* GCC doesn't align CONTEXT corrcectly */
73  char _contextbuf[sizeof(CONTEXT)+__alignof(CONTEXT)];
74  CONTEXT  *pcontext;
75  HANDLE hthread = (HANDLE)(target->osid);
76  pc where;
77  area *cs = target->cs_area, *ts = target->cs_area;
78  DWORD rc;
79  BOOL io_pending;
80
81  pcontext = (CONTEXT *)((((natural)&_contextbuf)+15)&~15);
82  rc = SuspendThread(hthread);
83  if (rc == -1) {
84    return -1;
85  }
86  /* What if the suspend count is > 1 at this point ?  I don't think
87     that that matters, but I'm not sure */
88  pcontext->ContextFlags = CONTEXT_ALL;
89  rc = GetThreadContext(hthread, pcontext);
90  if (rc == 0) {
91    return ESRCH;
92  }
93
94  where = (pc)(xpPC(pcontext));
95 
96  if ((target->valence != TCR_STATE_LISP) ||
97      (TCR_INTERRUPT_LEVEL(target) < 0) ||
98      (target->unwinding != 0) ||
99      (!((where < (pc)lisp_global(HEAP_END)) &&
100         (where >= (pc)lisp_global(HEAP_START))) &&
101       !((where < spentry_end) && (where >= spentry_start)) &&
102       !((where < subprims_end) && (where >= subprims_start)) &&
103       !((where < (pc) 0x16000) &&
104         (where >= (pc) 0x15000)) &&
105       !((where < (pc) (ts->high)) &&
106         (where >= (pc) (ts->low))))) {
107    /* If the thread's in a blocking syscall, it'd be nice to
108       get it out of that state here. */
109    GetThreadIOPendingFlag(hthread,&io_pending);
110    target->interrupt_pending = (1LL << (nbits_in_word - 1LL));
111    if (io_pending) {
112      pending_io * pending = (pending_io *) (target->pending_io_info);
113      if (pending) {
114        if (pCancelIoEx) {
115          pCancelIoEx(pending->h, pending->o);
116        } else {
117          CancelIo(pending->h);
118        }
119      }
120    }
121    if (pCancelSynchronousIo) {
122      pCancelSynchronousIo(hthread);
123    }
124    QueueUserAPC(nullAPC, hthread, 0);
125    ResumeThread(hthread);
126    return 0;
127  } else {
128    /* Thread is running lisp code with interupts enabled.  Set it
129       so that it calls out and then returns to the context,
130       handling any necessary pc-lusering. */
131    LispObj foreign_rsp = (((LispObj)(target->foreign_sp))-0x200)&~15;
132    CONTEXT *icontext = ((CONTEXT *) foreign_rsp) -1;
133    icontext = (CONTEXT *)(((LispObj)icontext)&~15);
134   
135    *icontext = *pcontext;
136
137#ifdef WIN_64   
138    xpGPR(pcontext,REG_RCX) = SIGNAL_FOR_PROCESS_INTERRUPT;
139    xpGPR(pcontext,REG_RDX) = 0;
140    xpGPR(pcontext,REG_R8) = (LispObj) icontext;
141    xpGPR(pcontext,REG_RSP) = (LispObj)(((LispObj *)icontext)-1);
142    *(((LispObj *)icontext)-1) = (LispObj)raise_thread_interrupt;
143#else
144    {
145      LispObj *p = (LispObj *)icontext;
146      p -= 4;
147      p[0] = SIGNAL_FOR_PROCESS_INTERRUPT;
148      p[1] = 0;
149      p[2] = (DWORD)icontext;
150      *(--p) = (LispObj)raise_thread_interrupt;;
151      xpGPR(pcontext,Isp) = (DWORD)p;
152#ifdef WIN32_ES_HACK
153      pcontext->SegEs = pcontext->SegDs;
154#endif
155    }
156#endif
157    pcontext->EFlags &= ~0x400;  /* clear direction flag */
158    xpPC(pcontext) = (LispObj)interrupt_handler;
159    SetThreadContext(hthread,pcontext);
160    ResumeThread(hthread);
161    return 0;
162  }
163}
164#else
165int
166raise_thread_interrupt(TCR *target)
167{
168  pthread_t thread = (pthread_t)target->osid;
169#ifdef DARWIN_not_yet
170  if (use_mach_exception_handling) {
171    return mach_raise_thread_interrupt(target);
172  }
173#endif
174  if (thread != (pthread_t) 0) {
175    return pthread_kill(thread, SIGNAL_FOR_PROCESS_INTERRUPT);
176  }
177  return ESRCH;
178}
179#endif
180
181signed_natural
182atomic_incf_by(signed_natural *ptr, signed_natural by)
183{
184  signed_natural old, new;
185  do {
186    old = *ptr;
187    new = old+by;
188  } while (store_conditional((natural *)ptr, (natural) old, (natural) new) !=
189           (natural) old);
190  return new;
191}
192
193signed_natural
194atomic_incf(signed_natural *ptr)
195{
196  return atomic_incf_by(ptr, 1);
197}
198
199signed_natural
200atomic_decf(signed_natural *ptr)
201{
202  signed_natural old, new;
203  do {
204    old = *ptr;
205    new = old == 0 ? old : old-1;
206  } while (store_conditional((natural *)ptr, (natural) old, (natural) new) !=
207           (natural) old);
208  return old-1;
209}
210
211
212#ifndef USE_FUTEX
213int spin_lock_tries = 1;
214
215void
216get_spin_lock(signed_natural *p, TCR *tcr)
217{
218  int i, n = spin_lock_tries;
219 
220  while (1) {
221    for (i = 0; i < n; i++) {
222      if (atomic_swap(p,(signed_natural)tcr) == 0) {
223        return;
224      }
225    }
226#ifndef WINDOWS
227    sched_yield();
228#endif
229  }
230}
231#endif
232
233#ifndef USE_FUTEX
234int
235lock_recursive_lock(RECURSIVE_LOCK m, TCR *tcr)
236{
237
238  if (tcr == NULL) {
239    tcr = get_tcr(true);
240  }
241  if (m->owner == tcr) {
242    m->count++;
243    return 0;
244  }
245  while (1) {
246    LOCK_SPINLOCK(m->spinlock,tcr);
247    ++m->avail;
248    if (m->avail == 1) {
249      m->owner = tcr;
250      m->count = 1;
251      RELEASE_SPINLOCK(m->spinlock);
252      break;
253    }
254    RELEASE_SPINLOCK(m->spinlock);
255    SEM_WAIT_FOREVER(m->signal);
256  }
257  return 0;
258}
259
260#else /* USE_FUTEX */
261
262static void inline
263lock_futex(signed_natural *p)
264{
265 
266  while (1) {
267    if (store_conditional(p,FUTEX_AVAIL,FUTEX_LOCKED) == FUTEX_AVAIL) {
268      return;
269    }
270    while (1) {
271      if (atomic_swap(p,FUTEX_CONTENDED) == FUTEX_AVAIL) {
272        return;
273      }
274      futex_wait(p,FUTEX_CONTENDED);
275    }
276  }
277}
278
279static void inline
280unlock_futex(signed_natural *p)
281{
282  if (atomic_decf(p) != FUTEX_AVAIL) {
283    *p = FUTEX_AVAIL;
284    futex_wake(p,INT_MAX);
285  }
286}
287   
288int
289lock_recursive_lock(RECURSIVE_LOCK m, TCR *tcr)
290{
291  if (tcr == NULL) {
292    tcr = get_tcr(true);
293  }
294  if (m->owner == tcr) {
295    m->count++;
296    return 0;
297  }
298  lock_futex(&m->avail);
299  m->owner = tcr;
300  m->count = 1;
301  return 0;
302}
303#endif /* USE_FUTEX */
304
305
306#ifndef USE_FUTEX 
307int
308unlock_recursive_lock(RECURSIVE_LOCK m, TCR *tcr)
309{
310  int ret = EPERM, pending;
311
312  if (tcr == NULL) {
313    tcr = get_tcr(true);
314  }
315
316  if (m->owner == tcr) {
317    --m->count;
318    if (m->count == 0) {
319      LOCK_SPINLOCK(m->spinlock,tcr);
320      m->owner = NULL;
321      pending = m->avail-1 + m->waiting;     /* Don't count us */
322      m->avail = 0;
323      --pending;
324      if (pending > 0) {
325        m->waiting = pending;
326      } else {
327        m->waiting = 0;
328      }
329      RELEASE_SPINLOCK(m->spinlock);
330      if (pending >= 0) {
331        SEM_RAISE(m->signal);
332      }
333    }
334    ret = 0;
335  }
336  return ret;
337}
338#else /* USE_FUTEX */
339int
340unlock_recursive_lock(RECURSIVE_LOCK m, TCR *tcr)
341{
342  int ret = EPERM;
343
344   if (tcr == NULL) {
345    tcr = get_tcr(true);
346  }
347
348  if (m->owner == tcr) {
349    --m->count;
350    if (m->count == 0) {
351      m->owner = NULL;
352      unlock_futex(&m->avail);
353    }
354    ret = 0;
355  }
356  return ret;
357}
358#endif /* USE_FUTEX */
359
360void
361destroy_recursive_lock(RECURSIVE_LOCK m)
362{
363#ifndef USE_FUTEX
364  destroy_semaphore((void **)&m->signal);
365#endif
366  postGCfree((void *)(m->malloced_ptr));
367}
368
369/*
370  If we're already the owner (or if the lock is free), lock it
371  and increment the lock count; otherwise, return EBUSY without
372  waiting.
373*/
374
375#ifndef USE_FUTEX
376int
377recursive_lock_trylock(RECURSIVE_LOCK m, TCR *tcr, int *was_free)
378{
379  TCR *owner = m->owner;
380
381  LOCK_SPINLOCK(m->spinlock,tcr);
382  if (owner == tcr) {
383    m->count++;
384    if (was_free) {
385      *was_free = 0;
386      RELEASE_SPINLOCK(m->spinlock);
387      return 0;
388    }
389  }
390  if (store_conditional((natural*)&(m->avail), 0, 1) == 0) {
391    m->owner = tcr;
392    m->count = 1;
393    if (was_free) {
394      *was_free = 1;
395    }
396    RELEASE_SPINLOCK(m->spinlock);
397    return 0;
398  }
399
400  RELEASE_SPINLOCK(m->spinlock);
401  return EBUSY;
402}
403#else
404int
405recursive_lock_trylock(RECURSIVE_LOCK m, TCR *tcr, int *was_free)
406{
407  TCR *owner = m->owner;
408
409  if (owner == tcr) {
410    m->count++;
411    if (was_free) {
412      *was_free = 0;
413      return 0;
414    }
415  }
416  if (store_conditional((natural*)&(m->avail), 0, 1) == 0) {
417    m->owner = tcr;
418    m->count = 1;
419    if (was_free) {
420      *was_free = 1;
421    }
422    return 0;
423  }
424
425  return EBUSY;
426}
427#endif
428
429void
430sem_wait_forever(SEMAPHORE s)
431{
432  int status;
433
434  do {
435#ifdef USE_MACH_SEMAPHORES
436    mach_timespec_t q = {1,0};
437    status = SEM_TIMEDWAIT(s,q);
438#endif
439#ifdef USE_POSIX_SEMAPHORES
440    struct timespec q;
441    gettimeofday((struct timeval *)&q, NULL);
442    q.tv_sec += 1;
443    status = SEM_TIMEDWAIT(s,&q);
444#endif
445#ifdef USE_WINDOWS_SEMAPHORES
446    status = (WaitForSingleObject(s,1000L) == WAIT_TIMEOUT) ? 1 : 0;
447#endif
448  } while (status != 0);
449}
450
451int
452wait_on_semaphore(void *s, int seconds, int millis)
453{
454#ifdef USE_POSIX_SEMAPHORES
455  int nanos = (millis % 1000) * 1000000;
456  int status;
457
458  struct timespec q;
459  gettimeofday((struct timeval *)&q, NULL);
460  q.tv_nsec *= 1000L;  /* microseconds -> nanoseconds */
461   
462  q.tv_nsec += nanos;
463  if (q.tv_nsec >= 1000000000L) {
464    q.tv_nsec -= 1000000000L;
465    seconds += 1;
466  }
467  q.tv_sec += seconds;
468  status = SEM_TIMEDWAIT(s, &q);
469  if (status < 0) {
470    return errno;
471  }
472  return status;
473#endif
474#ifdef USE_MACH_SEMAPHORES
475  int nanos = (millis % 1000) * 1000000;
476  mach_timespec_t q = {seconds, nanos};
477  int status = SEM_TIMEDWAIT(s, q);
478
479 
480  switch (status) {
481  case 0: return 0;
482  case KERN_OPERATION_TIMED_OUT: return ETIMEDOUT;
483  case KERN_ABORTED: return EINTR;
484  default: return EINVAL;
485  }
486#endif
487#ifdef USE_WINDOWS_SEMAPHORES
488  switch (WaitForSingleObjectEx(s, seconds*1000L+(DWORD)millis,true)) {
489  case WAIT_OBJECT_0:
490    return 0;
491  case WAIT_TIMEOUT:
492    return /* ETIMEDOUT */ WAIT_TIMEOUT;
493  case WAIT_IO_COMPLETION:
494    return EINTR;
495  default:
496    break;
497  }
498  return EINVAL;
499
500#endif
501}
502
503
504int
505semaphore_maybe_timedwait(void *s, struct timespec *t)
506{
507  if (t) {
508    return wait_on_semaphore(s, t->tv_sec, t->tv_nsec/1000000L);
509  }
510  SEM_WAIT_FOREVER(s);
511  return 0;
512}
513
514void
515signal_semaphore(SEMAPHORE s)
516{
517  SEM_RAISE(s);
518}
519
520 
521#ifdef WINDOWS
522LispObj
523current_thread_osid()
524{
525  TCR *tcr = get_tcr(false);
526  LispObj current = 0;
527
528  if (tcr) {
529    current = tcr->osid;
530  }
531  if (current == 0) {
532    DuplicateHandle(GetCurrentProcess(),
533                    GetCurrentThread(),
534                    GetCurrentProcess(),
535                    (LPHANDLE)(&current),
536                    0,
537                    FALSE,
538                    DUPLICATE_SAME_ACCESS);
539    if (tcr) {
540      tcr->osid = current;
541    }
542  }
543  return current;
544}
545#else
546LispObj
547current_thread_osid()
548{
549  return (LispObj)ptr_to_lispobj(pthread_self());
550}
551#endif
552
553
554int thread_suspend_signal = 0, thread_kill_signal = 0;
555
556
557
558void
559linux_exception_init(TCR *tcr)
560{
561}
562
563
564TCR *
565get_interrupt_tcr(Boolean create)
566{
567  return get_tcr(create);
568}
569 
570void
571suspend_resume_handler(int signo, siginfo_t *info, ExceptionInformation *context)
572{
573#ifdef DARWIN_GS_HACK
574  Boolean gs_was_tcr = ensure_gs_pthread();
575#endif
576  TCR *tcr = get_interrupt_tcr(false);
577 
578  if (tcr == NULL) {
579    /* Got a suspend signal sent to the pthread. */
580    extern natural initial_stack_size;
581    void register_thread_tcr(TCR *);
582   
583    tcr = new_tcr(initial_stack_size, MIN_TSTACK_SIZE);
584    tcr->suspend_count = 1;
585    tcr->vs_area->active -= node_size;
586    *(--tcr->save_vsp) = lisp_nil;
587    register_thread_tcr(tcr);
588  }
589  if (TCR_INTERRUPT_LEVEL(tcr) <= (-2<<fixnumshift)) {
590    SET_TCR_FLAG(tcr,TCR_FLAG_BIT_PENDING_SUSPEND);
591  } else {
592    tcr->suspend_context = context;
593    SEM_RAISE(tcr->suspend);
594    SEM_WAIT_FOREVER(tcr->resume);
595    tcr->suspend_context = NULL;
596  }
597#ifdef DARWIN_GS_HACK
598  if (gs_was_tcr) {
599    set_gs_address(tcr);
600  }
601#endif
602  SIGRETURN(context);
603}
604
605 
606
607/*
608  'base' should be set to the bottom (origin) of the stack, e.g., the
609  end from which it grows.
610*/
611 
612#ifdef WINDOWS
613void
614os_get_current_thread_stack_bounds(void **base, natural *size)
615{
616  natural natbase;
617  MEMORY_BASIC_INFORMATION info;
618  void *addr = (void *)current_stack_pointer();
619 
620  VirtualQuery(addr, &info, sizeof(info));
621  natbase = (natural)info.BaseAddress+info.RegionSize;
622  *size = natbase - (natural)(info.AllocationBase);
623  *base = (void *)natbase;
624}
625#else
626void
627os_get_current_thread_stack_bounds(void **base, natural *size)
628{
629  pthread_t p = pthread_self();
630#ifdef DARWIN
631  *base = pthread_get_stackaddr_np(p);
632  *size = pthread_get_stacksize_np(p);
633#endif
634#ifdef LINUX
635  pthread_attr_t attr;
636
637  pthread_getattr_np(p,&attr);
638  pthread_attr_getstack(&attr, base, size);
639  pthread_attr_destroy(&attr);
640  *(natural *)base += *size;
641#endif
642#ifdef FREEBSD
643  pthread_attr_t attr;
644  void * temp_base;
645  size_t temp_size;
646 
647
648  pthread_attr_init(&attr); 
649  pthread_attr_get_np(p, &attr);
650  pthread_attr_getstackaddr(&attr,&temp_base);
651  pthread_attr_getstacksize(&attr,&temp_size);
652  *base = (void *)((natural)temp_base + temp_size);
653  *size = temp_size;
654  pthread_attr_destroy(&attr);
655#endif
656#ifdef SOLARIS
657  stack_t st;
658 
659  thr_stksegment(&st);
660  *size = st.ss_size;
661  *base = st.ss_sp;
662 
663#endif
664}
665#endif
666
667void *
668new_semaphore(int count)
669{
670#ifdef USE_POSIX_SEMAPHORES
671  sem_t *s = malloc(sizeof(sem_t));
672  sem_init(s, 0, count);
673  return s;
674#endif
675#ifdef USE_MACH_SEMAPHORES
676  semaphore_t s = (semaphore_t)0;
677  semaphore_create(mach_task_self(),&s, SYNC_POLICY_FIFO, count);
678  return (void *)(natural)s;
679#endif
680#ifdef USE_WINDOWS_SEMAPHORES
681  return CreateSemaphore(NULL, count, 0x7fffL, NULL);
682#endif
683}
684
685RECURSIVE_LOCK
686new_recursive_lock()
687{
688  extern int cache_block_size;
689  void *p = calloc(1,sizeof(_recursive_lock)+cache_block_size-1);
690  RECURSIVE_LOCK m = NULL;
691#ifndef USE_FUTEX
692  void *signal = new_semaphore(0);
693#endif
694  if (p) {
695    m = (RECURSIVE_LOCK) ((((natural)p)+cache_block_size-1) & (~(cache_block_size-1)));
696    m->malloced_ptr = p;
697  }
698
699#ifdef USE_FUTEX
700  if (m) {
701    return m;
702  }
703#else
704  if (m && signal) {
705    m->signal = signal;
706    return m;
707  }
708  if (m) {
709    free(p);
710  }
711  if (signal) {
712    destroy_semaphore(&signal);
713  }
714#endif
715  return NULL;
716}
717
718void
719destroy_semaphore(void **s)
720{
721  if (*s) {
722#ifdef USE_POSIX_SEMAPHORES
723    sem_destroy((sem_t *)*s);
724    if (lisp_global(IN_GC)) {
725      postGCfree(*s);
726    } else {
727      free(*s);
728    }
729#endif
730#ifdef USE_MACH_SEMAPHORES
731    semaphore_destroy(mach_task_self(),((semaphore_t)(natural) *s));
732#endif
733#ifdef USE_WINDOWS_SEMAPHORES
734    CloseHandle(*s);
735#endif
736    *s=NULL;
737  }
738}
739
740#ifdef WINDOWS
741void
742tsd_set(LispObj key, void *datum)
743{
744  TlsSetValue((DWORD)key, datum);
745}
746
747void *
748tsd_get(LispObj key)
749{
750  return TlsGetValue((DWORD)key);
751}
752#else
753void
754tsd_set(LispObj key, void *datum)
755{
756  pthread_setspecific((pthread_key_t)key, datum);
757}
758
759void *
760tsd_get(LispObj key)
761{
762  return pthread_getspecific((pthread_key_t)key);
763}
764#endif
765
766void
767dequeue_tcr(TCR *tcr)
768{
769  TCR *next, *prev;
770
771  next = tcr->next;
772  prev = tcr->prev;
773
774  prev->next = next;
775  next->prev = prev;
776  tcr->prev = tcr->next = NULL;
777#ifdef X8664
778  tcr->linear = NULL;
779#endif
780}
781 
782void
783enqueue_tcr(TCR *new)
784{
785  TCR *head, *tail;
786 
787  LOCK(lisp_global(TCR_AREA_LOCK),new);
788  head = (TCR *)ptr_from_lispobj(lisp_global(INITIAL_TCR));
789  tail = head->prev;
790  tail->next = new;
791  head->prev = new;
792  new->prev = tail;
793  new->next = head;
794  UNLOCK(lisp_global(TCR_AREA_LOCK),new);
795}
796
797#ifdef WIN_32
798TCR *
799allocate_tcr()
800{
801  void *p = calloc(1,sizeof(TCR)+15);
802  TCR *tcr = (TCR *)((((natural)p)+15)&~15);
803
804  tcr->allocated = p;
805  return tcr;
806}
807#else
808TCR *
809allocate_tcr()
810{
811  TCR *tcr, *chain = NULL, *next;
812#ifdef DARWIN
813  extern Boolean use_mach_exception_handling;
814  kern_return_t kret;
815  mach_port_t
816    thread_exception_port,
817    task_self = mach_task_self();
818#endif
819  for (;;) {
820    tcr = calloc(1, sizeof(TCR));
821#ifdef DARWIN
822#if WORD_SIZE == 64
823    if (((unsigned)((natural)tcr)) != ((natural)tcr)) {
824      tcr->next = chain;
825      chain = tcr;
826      continue;
827    }
828#endif
829    if (use_mach_exception_handling) {
830      thread_exception_port = (mach_port_t)((natural)tcr);
831      kret = mach_port_allocate_name(task_self,
832                                     MACH_PORT_RIGHT_RECEIVE,
833                                     thread_exception_port);
834    } else {
835      kret = KERN_SUCCESS;
836    }
837
838    if (kret != KERN_SUCCESS) {
839      tcr->next = chain;
840      chain = tcr;
841      continue;
842    }
843#endif
844    for (;chain;chain = next) {
845      next = chain->next;
846      free(chain);
847    }
848    return tcr;
849  }
850}
851#endif
852
853#ifdef X8664
854#ifdef LINUX
855#include <asm/prctl.h>
856#include <sys/prctl.h>
857#endif
858#ifdef FREEBSD
859#include <machine/sysarch.h>
860#endif
861
862void
863setup_tcr_extra_segment(TCR *tcr)
864{
865#ifdef FREEBSD
866  amd64_set_gsbase(tcr);
867#endif
868#ifdef LINUX
869  arch_prctl(ARCH_SET_GS, (natural)tcr);
870#endif
871#ifdef DARWIN
872  /* There's no way to do this yet.  See DARWIN_GS_HACK */
873  /* darwin_set_x8664_fs_reg(tcr); */
874#endif
875#ifdef SOLARIS
876  /* Chris Curtis found this and suggested the use of syscall here */
877  syscall(SYS_lwp_private,_LWP_SETPRIVATE, _LWP_GSBASE, tcr);
878#endif
879}
880
881#endif
882
883#ifdef X8632
884
885#ifdef DARWIN
886#include <architecture/i386/table.h>
887#include <architecture/i386/sel.h>
888#include <i386/user_ldt.h>
889
890void setup_tcr_extra_segment(TCR *tcr)
891{
892    uintptr_t addr = (uintptr_t)tcr;
893    unsigned int size = sizeof(*tcr);
894    ldt_entry_t desc;
895    sel_t sel;
896    int i;
897
898    desc.data.limit00 = (size - 1) & 0xffff;
899    desc.data.limit16 = ((size - 1) >> 16) & 0xf;
900    desc.data.base00 = addr & 0xffff;
901    desc.data.base16 = (addr >> 16) & 0xff;
902    desc.data.base24 = (addr >> 24) & 0xff;
903    desc.data.type = DESC_DATA_WRITE;
904    desc.data.dpl = USER_PRIV;
905    desc.data.present = 1;
906    desc.data.stksz = DESC_CODE_32B;
907    desc.data.granular = DESC_GRAN_BYTE;
908   
909    i = i386_set_ldt(LDT_AUTO_ALLOC, &desc, 1);
910
911    if (i < 0) {
912        perror("i386_set_ldt");
913    } else {
914        sel.index = i;
915        sel.rpl = USER_PRIV;
916        sel.ti = SEL_LDT;
917        tcr->ldt_selector = sel;
918    }
919}
920
921void free_tcr_extra_segment(TCR *tcr)
922{
923  /* load %fs with null segement selector */
924  __asm__ volatile ("mov %0,%%fs" : : "r"(0));
925  if (i386_set_ldt(tcr->ldt_selector.index, NULL, 1) < 0)
926    perror("i386_set_ldt");
927  tcr->ldt_selector = NULL_SEL;
928}
929#endif
930
931#ifdef LINUX
932
933#include <asm/ldt.h>
934#include <sys/syscall.h>
935
936/* see desc_struct in kernel/include/asm-i386/processor.h */
937typedef struct {
938  uint32_t a;
939  uint32_t b;
940} linux_desc_struct;
941
942
943#define desc_avail(d) (((d)->a) == 0)
944
945linux_desc_struct linux_ldt_entries[LDT_ENTRIES];
946
947/* We have to ask the Linux kernel for a copy of the ldt table
948   and manage it ourselves.  It's not clear that this is
949   thread-safe in general, but we can at least ensure that
950   it's thread-safe wrt lisp threads. */
951
952pthread_mutex_t ldt_lock = PTHREAD_MUTEX_INITIALIZER;  /* simple, non-recursive mutex */
953
954int
955modify_ldt(int func, void *ptr, unsigned long bytecount)
956{
957  return syscall(__NR_modify_ldt, func, ptr, bytecount);
958}
959
960
961void
962setup_tcr_extra_segment(TCR *tcr)
963{
964  int i, n;
965  short sel;
966  struct user_desc u = {1, 0, 0, 1, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 1};
967  linux_desc_struct *d = linux_ldt_entries;
968
969  pthread_mutex_lock(&ldt_lock);
970  n = modify_ldt(0,d,LDT_ENTRIES*LDT_ENTRY_SIZE)/LDT_ENTRY_SIZE;
971  for (i = 0; i < n; i++,d++) {
972    if (desc_avail(d)) {
973      break;
974    }
975  }
976  if (i == LDT_ENTRIES) {
977    pthread_mutex_unlock(&ldt_lock);
978    fprintf(dbgout, "All 8192 ldt entries in use ?\n");
979    _exit(1);
980  }
981  u.entry_number = i;
982  u.base_addr = (uint32_t)tcr;
983  u.limit = sizeof(TCR);
984  u.limit_in_pages = 0;
985  if (modify_ldt(1,&u,sizeof(struct user_desc)) != 0) {
986    pthread_mutex_unlock(&ldt_lock);
987    fprintf(dbgout,"Can't assign LDT entry\n");
988    _exit(1);
989  }
990  sel = (i << 3) | 7;
991  tcr->ldt_selector = sel;
992  pthread_mutex_unlock(&ldt_lock);
993}
994
995void
996free_tcr_extra_segment(TCR *tcr)
997{
998  struct user_desc u = {0, 0, 0, 0, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 0};
999  short sel = tcr->ldt_selector;
1000
1001  pthread_mutex_lock(&ldt_lock);
1002  /* load %fs with null segment selector */
1003  __asm__ volatile ("mov %0,%%fs" : : "r"(0));
1004  tcr->ldt_selector = 0;
1005  u.entry_number = (sel>>3);
1006  modify_ldt(1,&u,sizeof(struct user_desc));
1007  pthread_mutex_unlock(&ldt_lock);
1008 
1009}
1010
1011#endif
1012
1013#ifdef WINDOWS
1014bitvector ldt_entries_in_use = NULL;
1015HANDLE ldt_lock;
1016
1017typedef struct {
1018  DWORD offset;
1019  DWORD size;
1020  LDT_ENTRY entry;
1021} win32_ldt_info;
1022
1023
1024int WINAPI (*NtQueryInformationProcess)(HANDLE,DWORD,VOID*,DWORD,DWORD*);
1025int WINAPI (*NtSetInformationProcess)(HANDLE,DWORD,VOID*,DWORD);
1026
1027void
1028init_win32_ldt()
1029{
1030  HANDLE hNtdll;
1031  int status = 0xc0000002;
1032  win32_ldt_info info;
1033  DWORD nret;
1034 
1035
1036  ldt_entries_in_use=malloc(8192/8);
1037  zero_bits(ldt_entries_in_use,8192);
1038  ldt_lock = CreateMutex(NULL,0,NULL);
1039
1040  hNtdll = LoadLibrary("ntdll.dll");
1041  NtQueryInformationProcess = (void*)GetProcAddress(hNtdll, "NtQueryInformationProcess");
1042  NtSetInformationProcess = (void*)GetProcAddress(hNtdll, "NtSetInformationProcess");
1043  if (NtQueryInformationProcess != NULL) {
1044    info.offset = 0;
1045    info.size = sizeof(LDT_ENTRY);
1046    status = NtQueryInformationProcess(GetCurrentProcess(),10,&info,sizeof(info),&nret);
1047  }
1048
1049  if (status) {
1050    fprintf(dbgout, "This application can't run under this OS version\n");
1051    _exit(1);
1052  }
1053}
1054
1055void
1056setup_tcr_extra_segment(TCR *tcr)
1057{
1058  int i, status;
1059  DWORD nret;
1060  win32_ldt_info info;
1061  LDT_ENTRY *entry = &(info.entry);
1062  DWORD *words = (DWORD *)entry, tcraddr = (DWORD)tcr;
1063
1064
1065  WaitForSingleObject(ldt_lock,INFINITE);
1066
1067  for (i = 0; i < 8192; i++) {
1068    if (!ref_bit(ldt_entries_in_use,i)) {
1069      info.offset = i << 3;
1070      info.size = sizeof(LDT_ENTRY);
1071      words[0] = 0;
1072      words[1] = 0;
1073      status = NtQueryInformationProcess(GetCurrentProcess(),10,&info,sizeof(info),&nret);
1074      if (status == 0) {
1075        if ((info.size == 0) ||
1076            ((words[0] == 0) && (words[1] == 0))) {
1077          break;
1078        }
1079      }
1080    }
1081  }
1082  if (i == 8192) {
1083    ReleaseMutex(ldt_lock);
1084    fprintf(dbgout, "All 8192 ldt entries in use ?\n");
1085    _exit(1);
1086  }
1087  set_bit(ldt_entries_in_use,i);
1088  words[0] = 0;
1089  words[1] = 0;
1090  entry->LimitLow = sizeof(TCR);
1091  entry->BaseLow = tcraddr & 0xffff;
1092  entry->HighWord.Bits.BaseMid = (tcraddr >> 16) & 0xff;
1093  entry->HighWord.Bits.BaseHi = (tcraddr >> 24);
1094  entry->HighWord.Bits.Pres = 1;
1095  entry->HighWord.Bits.Default_Big = 1;
1096  entry->HighWord.Bits.Type = 16 | 2; /* read-write data */
1097  entry->HighWord.Bits.Dpl = 3; /* for use by the great unwashed */
1098  info.size = sizeof(LDT_ENTRY);
1099  status = NtSetInformationProcess(GetCurrentProcess(),10,&info,sizeof(info));
1100  if (status != 0) {
1101    ReleaseMutex(ldt_lock);
1102    FBug(NULL, "can't set LDT entry %d, status = 0x%x", i, status);
1103  }
1104#if 1
1105  /* Sanity check */
1106  info.offset = i << 3;
1107  info.size = sizeof(LDT_ENTRY);
1108  words[0] = 0;
1109  words[0] = 0;
1110  NtQueryInformationProcess(GetCurrentProcess(),10,&info,sizeof(info),&nret);
1111  if (((entry->BaseLow)|((entry->HighWord.Bits.BaseMid)<<16)|((entry->HighWord.Bits.BaseHi)<<24)) != tcraddr) {
1112    Bug(NULL, "you blew it: bad address in ldt entry\n");
1113  }
1114#endif
1115  tcr->ldt_selector = (i << 3) | 7;
1116  ReleaseMutex(ldt_lock);
1117}
1118
1119void 
1120free_tcr_extra_segment(TCR *tcr)
1121{
1122  win32_ldt_info info;
1123  LDT_ENTRY *entry = &(info.entry);
1124  DWORD *words = (DWORD *)entry;
1125  int idx = tcr->ldt_selector >> 3;
1126
1127
1128  info.offset = idx << 3;
1129  info.size = sizeof(LDT_ENTRY);
1130
1131  words[0] = 0;
1132  words[1] = 0;
1133
1134  WaitForSingleObject(ldt_lock,INFINITE);
1135  NtSetInformationProcess(GetCurrentProcess(),10,&info,sizeof(info));
1136  clr_bit(ldt_entries_in_use,idx);
1137  ReleaseMutex(ldt_lock);
1138
1139  tcr->ldt_selector = 0;
1140}
1141
1142#endif
1143#ifdef FREEBSD
1144#include <machine/segments.h>
1145#include <machine/sysarch.h>
1146
1147/* It'd be tempting to use i386_set_fsbase() here, but there doesn't
1148   seem to be any way to free the GDT entry it creates.  Actually,
1149   it's not clear that that really sets a GDT entry; let's see */
1150
1151#define FREEBSD_USE_SET_FSBASE 1
1152void
1153setup_tcr_extra_segment(TCR *tcr)
1154{
1155#if !FREEBSD_USE_SET_FSBASE
1156  struct segment_descriptor sd;
1157  uintptr_t addr = (uintptr_t)tcr;
1158  unsigned int size = sizeof(*tcr);
1159  int i;
1160
1161  sd.sd_lolimit = (size - 1) & 0xffff;
1162  sd.sd_hilimit = ((size - 1) >> 16) & 0xf;
1163  sd.sd_lobase = addr & ((1<<24)-1);
1164  sd.sd_hibase = (addr>>24)&0xff;
1165
1166
1167
1168  sd.sd_type = 18;
1169  sd.sd_dpl = SEL_UPL;
1170  sd.sd_p = 1;
1171  sd.sd_def32 = 1;
1172  sd.sd_gran = 0;
1173
1174  i = i386_set_ldt(LDT_AUTO_ALLOC, (union descriptor *)&sd, 1);
1175
1176  if (i < 0) {
1177    perror("i386_set_ldt");
1178    exit(1);
1179  } else {
1180    tcr->ldt_selector = LSEL(i,SEL_UPL);
1181  }
1182#else
1183  extern unsigned short get_fs_register(void);
1184
1185  if (i386_set_fsbase((void*)tcr)) {
1186    perror("i386_set_fsbase");
1187    exit(1);
1188  }
1189
1190
1191  /* Once we've called i386_set_fsbase, we can't write to %fs. */
1192  tcr->ldt_selector = GSEL(GUFS_SEL, SEL_UPL);
1193#endif
1194}
1195
1196void 
1197free_tcr_extra_segment(TCR *tcr)
1198{
1199#if FREEBSD_USE_SET_FSBASE
1200  /* On a 32-bit kernel, this allocates a GDT entry.  It's not clear
1201     what it would mean to deallocate that entry. */
1202  /* If we're running on a 64-bit kernel, we can't write to %fs */
1203#else
1204  int idx = tcr->ldt_selector >> 3;
1205  /* load %fs with null segment selector */
1206  __asm__ volatile ("mov %0,%%fs" : : "r"(0));
1207  if (i386_set_ldt(idx, NULL, 1) < 0)
1208    perror("i386_set_ldt");
1209#endif
1210  tcr->ldt_selector = 0;
1211}
1212#endif
1213
1214#ifdef SOLARIS
1215#include <sys/sysi86.h>
1216
1217bitvector ldt_entries_in_use = NULL;
1218pthread_mutex_t ldt_lock = PTHREAD_MUTEX_INITIALIZER;  /* simple, non-recursive mutex */
1219
1220void
1221solaris_ldt_init()
1222{
1223  int fd;
1224  struct ssd s;
1225
1226  ldt_entries_in_use=malloc(8192/8);
1227  zero_bits(ldt_entries_in_use,8192);
1228 
1229  fd = open("/proc/self/ldt", O_RDONLY);
1230
1231  while(read(fd,&s,sizeof(s)) == sizeof(s)) {
1232    set_bit(ldt_entries_in_use,s.sel>>3);
1233  }
1234  close(fd);
1235}
1236   
1237
1238void
1239setup_tcr_extra_segment(TCR *tcr)
1240{
1241  struct ssd s;
1242  int i;
1243
1244  pthread_mutex_lock(&ldt_lock);
1245
1246  for (i = 0; i < 8192; i++) {
1247    if (!ref_bit(ldt_entries_in_use,i)) {
1248      s.sel = (i<<3)|7;
1249      s.bo = (unsigned int)tcr;
1250      s.ls = sizeof(TCR);
1251      s.acc1 = 0xf2;
1252      s.acc2 = 4;
1253
1254      if (sysi86(SI86DSCR, &s) >= 0) {
1255        set_bit(ldt_entries_in_use,i);
1256        tcr->ldt_selector = (i<<3)|7;
1257        pthread_mutex_unlock(&ldt_lock);
1258        return;
1259      }
1260      set_bit(ldt_entries_in_use,i);
1261    }
1262  }
1263  pthread_mutex_unlock(&ldt_lock);
1264  fprintf(dbgout, "All 8192 LDT descriptors in use\n");
1265  _exit(1);
1266
1267
1268 
1269}
1270
1271void 
1272free_tcr_extra_segment(TCR *tcr)
1273{
1274  struct ssd s;
1275  int i;
1276
1277  pthread_mutex_lock(&ldt_lock);
1278  __asm__ volatile ("mov %0,%%fs" : : "r"(0));
1279  s.sel = tcr->ldt_selector;
1280  i = s.sel>>3;
1281  tcr->ldt_selector = 0;
1282  s.bo = 0;
1283  s.ls = 0;
1284  s.acc1 = 0;
1285  s.acc2 = 0;
1286  sysi86(SI86DSCR, &s);
1287  clr_bit(ldt_entries_in_use,i);
1288  pthread_mutex_unlock(&ldt_lock);
1289}
1290
1291#endif
1292#endif
1293
1294/*
1295  Caller must hold the area_lock.
1296*/
1297TCR *
1298new_tcr(natural vstack_size, natural tstack_size)
1299{
1300  extern area
1301    *allocate_vstack_holding_area_lock(natural),
1302    *allocate_tstack_holding_area_lock(natural);
1303  area *a;
1304  int i;
1305#ifndef WINDOWS
1306  sigset_t sigmask;
1307
1308  sigemptyset(&sigmask);
1309  pthread_sigmask(SIG_SETMASK,&sigmask, NULL);
1310#endif
1311
1312#ifdef HAVE_TLS
1313  TCR *tcr = (TCR *) ((((natural)&tcrbuf)+((natural)15)) & ~((natural)15));
1314  current_tcr = tcr;
1315#else /* no TLS */
1316  TCR *tcr = allocate_tcr();
1317#endif
1318
1319#ifdef X86
1320  setup_tcr_extra_segment(tcr);
1321  tcr->linear = tcr;
1322#ifdef X8632
1323  tcr->node_regs_mask = X8632_DEFAULT_NODE_REGS_MASK;
1324#endif
1325#endif
1326
1327#if (WORD_SIZE == 64)
1328  tcr->single_float_convert.tag = subtag_single_float;
1329#endif
1330  lisp_global(TCR_COUNT) += (1<<fixnumshift);
1331  tcr->suspend = new_semaphore(0);
1332  tcr->resume = new_semaphore(0);
1333  tcr->reset_completion = new_semaphore(0);
1334  tcr->activate = new_semaphore(0);
1335  LOCK(lisp_global(TCR_AREA_LOCK),tcr);
1336  a = allocate_vstack_holding_area_lock(vstack_size);
1337  tcr->vs_area = a;
1338  a->owner = tcr;
1339  tcr->save_vsp = (LispObj *) a->active; 
1340  a = allocate_tstack_holding_area_lock(tstack_size);
1341  UNLOCK(lisp_global(TCR_AREA_LOCK),tcr);
1342  tcr->ts_area = a;
1343  a->owner = tcr;
1344  tcr->save_tsp = (LispObj *) a->active;
1345#ifdef X86
1346  tcr->next_tsp = tcr->save_tsp;
1347#endif
1348
1349  tcr->valence = TCR_STATE_FOREIGN;
1350#ifdef PPC
1351  tcr->lisp_fpscr.words.l = 0xd0;
1352#endif
1353#ifdef X86
1354  tcr->lisp_mxcsr = (1 << MXCSR_DM_BIT) | 
1355#if 1                           /* Mask underflow; too hard to
1356                                   deal with denorms if underflow is
1357                                   enabled */
1358    (1 << MXCSR_UM_BIT) | 
1359#endif
1360    (1 << MXCSR_PM_BIT);
1361#endif
1362  tcr->save_allocbase = tcr->save_allocptr = (void *) VOID_ALLOCPTR;
1363  tcr->tlb_limit = 2048<<fixnumshift;
1364  tcr->tlb_pointer = (LispObj *)malloc(tcr->tlb_limit);
1365  for (i = 0; i < 2048; i++) {
1366    tcr->tlb_pointer[i] = (LispObj) no_thread_local_binding_marker;
1367  }
1368  TCR_INTERRUPT_LEVEL(tcr) = (LispObj) (-1<<fixnum_shift);
1369#ifndef WINDOWS
1370  tcr->shutdown_count = PTHREAD_DESTRUCTOR_ITERATIONS;
1371#else
1372  tcr->shutdown_count = 1;
1373#endif
1374  return tcr;
1375}
1376
1377void
1378shutdown_thread_tcr(void *arg)
1379{
1380  TCR *tcr = TCR_FROM_TSD(arg),*current=get_tcr(0);
1381
1382  area *vs, *ts, *cs;
1383 
1384  if (current == NULL) {
1385    current = tcr;
1386  }
1387
1388  if (--(tcr->shutdown_count) == 0) {
1389    if (tcr->flags & (1<<TCR_FLAG_BIT_FOREIGN)) {
1390      LispObj callback_macptr = nrs_FOREIGN_THREAD_CONTROL.vcell,
1391        callback_ptr = ((macptr *)ptr_from_lispobj(untag(callback_macptr)))->address;
1392   
1393      tsd_set(lisp_global(TCR_KEY), TCR_TO_TSD(tcr));
1394      ((void (*)())ptr_from_lispobj(callback_ptr))(1);
1395      tsd_set(lisp_global(TCR_KEY), NULL);
1396    }
1397#ifdef DARWIN
1398    darwin_exception_cleanup(tcr);
1399#endif
1400    LOCK(lisp_global(TCR_AREA_LOCK),current);
1401    vs = tcr->vs_area;
1402    tcr->vs_area = NULL;
1403    ts = tcr->ts_area;
1404    tcr->ts_area = NULL;
1405    cs = tcr->cs_area;
1406    tcr->cs_area = NULL;
1407    if (vs) {
1408      condemn_area_holding_area_lock(vs);
1409    }
1410    if (ts) {
1411      condemn_area_holding_area_lock(ts);
1412    }
1413    if (cs) {
1414      condemn_area_holding_area_lock(cs);
1415    }
1416    destroy_semaphore(&tcr->suspend);
1417    destroy_semaphore(&tcr->resume);
1418    destroy_semaphore(&tcr->reset_completion);
1419    destroy_semaphore(&tcr->activate);
1420    tcr->tlb_limit = 0;
1421    free(tcr->tlb_pointer);
1422    tcr->tlb_pointer = NULL;
1423    tcr->osid = 0;
1424    tcr->interrupt_pending = 0;
1425    tcr->termination_semaphore = NULL;
1426#ifdef HAVE_TLS
1427    dequeue_tcr(tcr);
1428#endif
1429#ifdef X8632
1430    free_tcr_extra_segment(tcr);
1431#endif
1432#ifdef WIN32
1433    CloseHandle((HANDLE)tcr->io_datum);
1434    tcr->io_datum = NULL;
1435    free(tcr->native_thread_info);
1436    tcr->native_thread_info = NULL;
1437#endif
1438    UNLOCK(lisp_global(TCR_AREA_LOCK),current);
1439  } else {
1440    tsd_set(lisp_global(TCR_KEY), TCR_TO_TSD(tcr));
1441  }
1442}
1443
1444void
1445tcr_cleanup(void *arg)
1446{
1447  TCR *tcr = (TCR *)arg;
1448  area *a;
1449
1450  a = tcr->vs_area;
1451  if (a) {
1452    a->active = a->high;
1453  }
1454  a = tcr->ts_area;
1455  if (a) {
1456    a->active = a->high;
1457  }
1458  a = tcr->cs_area;
1459  if (a) {
1460    a->active = a->high;
1461  }
1462  tcr->valence = TCR_STATE_FOREIGN;
1463  tcr->shutdown_count = 1;
1464  shutdown_thread_tcr(tcr);
1465  tsd_set(lisp_global(TCR_KEY), NULL);
1466}
1467
1468void *
1469current_native_thread_id()
1470{
1471  return ((void *) (natural)
1472#ifdef LINUX
1473#ifdef __NR_gettid
1474          syscall(__NR_gettid)
1475#else
1476          getpid()
1477#endif
1478#endif
1479#ifdef DARWIN
1480          mach_thread_self()
1481#endif
1482#ifdef FREEBSD
1483          pthread_self()
1484#endif
1485#ifdef SOLARIS
1486          pthread_self()
1487#endif
1488#ifdef WINDOWS
1489          GetCurrentThreadId()
1490#endif
1491          );
1492}
1493
1494
1495void
1496thread_init_tcr(TCR *tcr, void *stack_base, natural stack_size)
1497{
1498  area *a, *register_cstack_holding_area_lock(BytePtr, natural);
1499
1500  tcr->osid = current_thread_osid();
1501  tcr->native_thread_id = current_native_thread_id();
1502  LOCK(lisp_global(TCR_AREA_LOCK),tcr);
1503  a = register_cstack_holding_area_lock((BytePtr)stack_base, stack_size);
1504  UNLOCK(lisp_global(TCR_AREA_LOCK),tcr);
1505  tcr->cs_area = a;
1506  a->owner = tcr;
1507  if (!(tcr->flags & (1<<TCR_FLAG_BIT_FOREIGN))) {
1508    tcr->cs_limit = (LispObj)ptr_to_lispobj(a->softlimit);
1509  }
1510#ifdef LINUX
1511#ifdef PPC
1512#ifndef PPC64
1513  tcr->native_thread_info = current_r2;
1514#endif
1515#endif
1516#endif
1517  tcr->errno_loc = &errno;
1518  tsd_set(lisp_global(TCR_KEY), TCR_TO_TSD(tcr));
1519#ifdef DARWIN
1520  extern Boolean use_mach_exception_handling;
1521  if (use_mach_exception_handling) {
1522    darwin_exception_init(tcr);
1523  }
1524#endif
1525#ifdef LINUX
1526  linux_exception_init(tcr);
1527#endif
1528#ifdef WINDOWS
1529  tcr->io_datum = (VOID *)CreateEvent(NULL, true, false, NULL);
1530  tcr->native_thread_info = malloc(sizeof(CONTEXT));
1531#endif
1532  tcr->log2_allocation_quantum = unbox_fixnum(lisp_global(DEFAULT_ALLOCATION_QUANTUM));
1533}
1534
1535/*
1536  Register the specified tcr as "belonging to" the current thread.
1537  Under Darwin, setup Mach exception handling for the thread.
1538  Install cleanup handlers for thread termination.
1539*/
1540void
1541register_thread_tcr(TCR *tcr)
1542{
1543  void *stack_base = NULL;
1544  natural stack_size = 0;
1545
1546  os_get_current_thread_stack_bounds(&stack_base, &stack_size);
1547  thread_init_tcr(tcr, stack_base, stack_size);
1548  enqueue_tcr(tcr);
1549}
1550
1551
1552 
1553 
1554#ifndef MAP_GROWSDOWN
1555#define MAP_GROWSDOWN 0
1556#endif
1557
1558Ptr
1559create_stack(natural size)
1560{
1561  Ptr p;
1562  size=align_to_power_of_2(size, log2_page_size);
1563  p = (Ptr) MapMemoryForStack((size_t)size);
1564  if (p != (Ptr)(-1)) {
1565    *((size_t *)p) = size;
1566    return p;
1567  }
1568  allocation_failure(true, size);
1569
1570}
1571
1572void *
1573allocate_stack(natural size)
1574{
1575  return create_stack(size);
1576}
1577
1578void
1579free_stack(void *s)
1580{
1581  size_t size = *((size_t *)s);
1582  UnMapMemory(s, size);
1583}
1584
1585Boolean threads_initialized = false;
1586
1587#ifndef USE_FUTEX
1588#ifdef WINDOWS
1589void
1590count_cpus()
1591{
1592  SYSTEM_INFO si;
1593
1594  GetSystemInfo(&si);
1595  if (si.dwNumberOfProcessors > 1) {
1596    spin_lock_tries = 1024;
1597  }
1598}
1599#else
1600void
1601count_cpus()
1602{
1603#ifdef DARWIN
1604  /* As of OSX 10.4, Darwin doesn't define _SC_NPROCESSORS_ONLN */
1605#include <mach/host_info.h>
1606
1607  struct host_basic_info info;
1608  mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
1609 
1610  if (KERN_SUCCESS == host_info(mach_host_self(), HOST_BASIC_INFO,(host_info_t)(&info),&count)) {
1611    if (info.max_cpus > 1) {
1612      spin_lock_tries = 1024;
1613    }
1614  }
1615#else
1616  int n = sysconf(_SC_NPROCESSORS_ONLN);
1617 
1618  if (n > 1) {
1619    spin_lock_tries = 1024;
1620  }
1621#endif
1622}
1623#endif
1624#endif
1625
1626void
1627init_threads(void * stack_base, TCR *tcr)
1628{
1629  lisp_global(INITIAL_TCR) = (LispObj)ptr_to_lispobj(tcr);
1630#ifdef WINDOWS
1631  lisp_global(TCR_KEY) = TlsAlloc();
1632  pCancelIoEx = windows_find_symbol(NULL, "CancelIoEx");
1633  pCancelSynchronousIo = windows_find_symbol(NULL, "CancelSynchronousIo");
1634#else
1635  pthread_key_create((pthread_key_t *)&(lisp_global(TCR_KEY)), shutdown_thread_tcr);
1636  thread_signal_setup();
1637#endif
1638
1639#ifndef USE_FUTEX
1640  count_cpus();
1641#endif
1642  threads_initialized = true;
1643}
1644
1645
1646#ifdef WINDOWS
1647unsigned CALLBACK
1648#else
1649void *
1650#endif
1651lisp_thread_entry(void *param)
1652{
1653  thread_activation *activation = (thread_activation *)param;
1654  TCR *tcr = new_tcr(activation->vsize, activation->tsize);
1655  LispObj *start_vsp;
1656#ifndef WINDOWS
1657  sigset_t mask, old_mask;
1658
1659  sigemptyset(&mask);
1660  pthread_sigmask(SIG_SETMASK, &mask, &old_mask);
1661#endif
1662
1663  register_thread_tcr(tcr);
1664
1665#ifndef WINDOWS
1666  pthread_cleanup_push(tcr_cleanup,(void *)tcr);
1667#endif
1668  tcr->vs_area->active -= node_size;
1669  *(--tcr->save_vsp) = lisp_nil;
1670  start_vsp = tcr->save_vsp;
1671  enable_fp_exceptions();
1672  SET_TCR_FLAG(tcr,TCR_FLAG_BIT_AWAITING_PRESET);
1673  activation->tcr = tcr;
1674  SEM_RAISE(activation->created);
1675  do {
1676    SEM_RAISE(tcr->reset_completion);
1677    SEM_WAIT_FOREVER(tcr->activate);
1678    /* Now go run some lisp code */
1679    start_lisp(TCR_TO_TSD(tcr),0);
1680    tcr->save_vsp = start_vsp;
1681  } while (tcr->flags & (1<<TCR_FLAG_BIT_AWAITING_PRESET));
1682#ifndef WINDOWS
1683  pthread_cleanup_pop(true);
1684#else
1685  tcr_cleanup(tcr);
1686#endif
1687#ifdef WINDOWS
1688  return 0;
1689#else
1690  return NULL;
1691#endif
1692}
1693
1694typedef 
1695short (*suspendf)();
1696
1697
1698void
1699suspend_current_cooperative_thread()
1700{
1701  static suspendf cooperative_suspend = NULL;
1702  void *xFindSymbol(void*,char*);
1703
1704  if (cooperative_suspend == NULL) {
1705    cooperative_suspend = (suspendf)xFindSymbol(NULL, "SetThreadState");
1706  }
1707  if (cooperative_suspend) {
1708    cooperative_suspend(1 /* kCurrentThreadID */,
1709                        1 /* kStoppedThreadState */,
1710                        0 /* kAnyThreadID */);
1711  }
1712}
1713
1714void *
1715cooperative_thread_startup(void *arg)
1716{
1717
1718  TCR *tcr = get_tcr(0);
1719  LispObj *start_vsp;
1720
1721  if (!tcr) {
1722    return NULL;
1723  }
1724#ifndef WINDOWS
1725  pthread_cleanup_push(tcr_cleanup,(void *)tcr);
1726#endif
1727  SET_TCR_FLAG(tcr,TCR_FLAG_BIT_AWAITING_PRESET);
1728  start_vsp = tcr->save_vsp;
1729  do {
1730    SEM_RAISE(tcr->reset_completion);
1731    suspend_current_cooperative_thread();
1732     
1733    start_lisp(tcr, 0);
1734    tcr->save_vsp = start_vsp;
1735  } while (tcr->flags & (1<<TCR_FLAG_BIT_AWAITING_PRESET));
1736#ifndef WINDOWS
1737  pthread_cleanup_pop(true);
1738#else
1739  tcr_cleanup(tcr);
1740#endif
1741}
1742
1743void *
1744xNewThread(natural control_stack_size,
1745           natural value_stack_size,
1746           natural temp_stack_size)
1747
1748{
1749  thread_activation activation;
1750
1751
1752  activation.tsize = temp_stack_size;
1753  activation.vsize = value_stack_size;
1754  activation.tcr = 0;
1755  activation.created = new_semaphore(0);
1756  if (create_system_thread(control_stack_size +(CSTACK_HARDPROT+CSTACK_SOFTPROT), 
1757                           NULL, 
1758                           lisp_thread_entry,
1759                           (void *) &activation)) {
1760   
1761    SEM_WAIT_FOREVER(activation.created);       /* Wait until thread's entered its initial function */
1762  }
1763  destroy_semaphore(&activation.created); 
1764  return TCR_TO_TSD(activation.tcr);
1765}
1766
1767Boolean
1768active_tcr_p(TCR *q)
1769{
1770  TCR *head = (TCR *)ptr_from_lispobj(lisp_global(INITIAL_TCR)), *p = head;
1771 
1772  do {
1773    if (p == q) {
1774      return true;
1775    }
1776    p = p->next;
1777  } while (p != head);
1778  return false;
1779}
1780
1781#ifdef WINDOWS
1782OSErr
1783xDisposeThread(TCR *tcr)
1784{
1785  return 0;                     /* I don't think that this is ever called. */
1786}
1787#else
1788OSErr
1789xDisposeThread(TCR *tcr)
1790{
1791  if (tcr != (TCR *)ptr_from_lispobj(lisp_global(INITIAL_TCR))) {
1792    if (active_tcr_p(tcr) && (tcr != get_tcr(false))) {
1793      pthread_cancel((pthread_t)(tcr->osid));
1794      return 0;
1795    }
1796  }
1797  return -50;
1798}
1799#endif
1800
1801OSErr
1802xYieldToThread(TCR *target)
1803{
1804  Bug(NULL, "xYieldToThread ?");
1805  return 0;
1806}
1807 
1808OSErr
1809xThreadCurrentStackSpace(TCR *tcr, unsigned *resultP)
1810{
1811  Bug(NULL, "xThreadCurrentStackSpace ?");
1812  return 0;
1813}
1814
1815
1816#ifdef WINDOWS
1817LispObj
1818create_system_thread(size_t stack_size,
1819                     void* stackaddr,
1820                     unsigned CALLBACK (*start_routine)(void *),
1821                     void* param)
1822{
1823  HANDLE thread_handle;
1824
1825  stack_size = ((stack_size+(((1<<16)-1)))&~((1<<16)-1));
1826
1827  thread_handle = (HANDLE)_beginthreadex(NULL, 
1828                                         0/*stack_size*/,
1829                                         start_routine,
1830                                         param,
1831                                         0, 
1832                                         NULL);
1833
1834  if (thread_handle == NULL) {
1835    wperror("CreateThread");
1836  }
1837  return (LispObj) ptr_to_lispobj(thread_handle);
1838}
1839#else
1840LispObj
1841create_system_thread(size_t stack_size,
1842                     void* stackaddr,
1843                     void* (*start_routine)(void *),
1844                     void* param)
1845{
1846  pthread_attr_t attr;
1847  pthread_t returned_thread = (pthread_t) 0;
1848  TCR *current = get_tcr(true);
1849
1850  pthread_attr_init(&attr);
1851  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 
1852
1853  if (stack_size == MINIMAL_THREAD_STACK_SIZE) {
1854    stack_size = PTHREAD_STACK_MIN;
1855  }
1856
1857  stack_size = ensure_stack_limit(stack_size);
1858  if (stackaddr != NULL) {
1859    /* Size must have been specified.  Sort of makes sense ... */
1860#ifdef DARWIN
1861    Fatal("no pthread_attr_setsetstack. "," Which end of stack does address refer to?");
1862#else
1863    pthread_attr_setstack(&attr, stackaddr, stack_size);
1864#endif
1865  } else if (stack_size != DEFAULT_THREAD_STACK_SIZE) {
1866    pthread_attr_setstacksize(&attr,stack_size);
1867  }
1868
1869  /*
1870     I think that's just about enough ... create the thread.
1871     Well ... not quite enough.  In Leopard (at least), many
1872     pthread routines grab an internal spinlock when validating
1873     their arguments.  If we suspend a thread that owns this
1874     spinlock, we deadlock.  We can't in general keep that
1875     from happening: if arbitrary C code is suspended while
1876     it owns the spinlock, we still deadlock.  It seems that
1877     the best that we can do is to keep -this- code from
1878     getting suspended (by grabbing TCR_AREA_LOCK)
1879  */
1880  LOCK(lisp_global(TCR_AREA_LOCK),current);
1881  pthread_create(&returned_thread, &attr, start_routine, param);
1882  UNLOCK(lisp_global(TCR_AREA_LOCK),current);
1883  pthread_attr_destroy(&attr);
1884  return (LispObj) ptr_to_lispobj(returned_thread);
1885}
1886#endif
1887
1888TCR *
1889get_tcr(Boolean create)
1890{
1891#ifdef HAVE_TLS
1892  TCR *current = current_tcr;
1893#else
1894  void *tsd = (void *)tsd_get(lisp_global(TCR_KEY));
1895  TCR *current = (tsd == NULL) ? NULL : TCR_FROM_TSD(tsd);
1896#endif
1897
1898  if ((current == NULL) && create) {
1899    LispObj callback_macptr = nrs_FOREIGN_THREAD_CONTROL.vcell,
1900      callback_ptr = ((macptr *)ptr_from_lispobj(untag(callback_macptr)))->address;
1901    int i, nbindwords = 0;
1902    extern natural initial_stack_size;
1903   
1904    /* Make one. */
1905    current = new_tcr(initial_stack_size, MIN_TSTACK_SIZE);
1906    SET_TCR_FLAG(current,TCR_FLAG_BIT_FOREIGN);
1907    register_thread_tcr(current);
1908#ifdef DEBUG_TCR_CREATION
1909#ifndef WINDOWS
1910    fprintf(dbgout, "\ncreating TCR for pthread 0x%x", pthread_self());
1911#endif
1912#endif
1913    current->vs_area->active -= node_size;
1914    *(--current->save_vsp) = lisp_nil;
1915#ifdef PPC
1916#define NSAVEREGS 8
1917#endif
1918#ifdef X8664
1919#define NSAVEREGS 4
1920#endif
1921#ifdef X8632
1922#define NSAVEREGS 0
1923#endif
1924    for (i = 0; i < NSAVEREGS; i++) {
1925      *(--current->save_vsp) = 0;
1926      current->vs_area->active -= node_size;
1927    }
1928    nbindwords = ((int (*)())ptr_from_lispobj(callback_ptr))(-1);
1929    for (i = 0; i < nbindwords; i++) {
1930      *(--current->save_vsp) = 0;
1931      current->vs_area->active -= node_size;
1932    }
1933    current->shutdown_count = 1;
1934    ((void (*)())ptr_from_lispobj(callback_ptr))(0);
1935
1936  }
1937 
1938  return current;
1939}
1940
1941#ifdef WINDOWS
1942void *
1943pc_luser_restore_windows_context(CONTEXT *pcontext, TCR *tcr, pc where)
1944{
1945  /* Thread has started to return from an exception. */
1946  if (where < restore_windows_context_iret) {
1947    /* In the process of restoring registers; context still in
1948       %rcx.  Just make our suspend_context be the context
1949       we're trying to restore, so that we'll resume from
1950       the suspend in the same context that we're trying to
1951       restore */
1952#ifdef WIN_64
1953    *pcontext = * (CONTEXT *)(pcontext->Rcx);
1954#else
1955    *pcontext = * (CONTEXT *)(pcontext->Ecx);
1956#endif
1957  } else {
1958    /* Most of the context has already been restored; fix %rcx
1959       if need be, then restore ss:rsp, cs:rip, and flags. */
1960#ifdef WIN_64
1961    x64_iret_frame *iret_frame = (x64_iret_frame *) (pcontext->Rsp);
1962
1963    pcontext->Rip = iret_frame->Rip;
1964    pcontext->SegCs = (WORD) iret_frame->Cs;
1965    pcontext->EFlags = (DWORD) iret_frame->Rflags;
1966    pcontext->Rsp = iret_frame->Rsp;
1967    pcontext->SegSs = (WORD) iret_frame->Ss;
1968#else
1969    ia32_iret_frame *iret_frame = (ia32_iret_frame *) (pcontext->Esp);
1970
1971    pcontext->Eip = iret_frame->Eip;
1972    pcontext->SegCs = (WORD) iret_frame->Cs;
1973    pcontext->EFlags = (DWORD) iret_frame->EFlags;
1974    pcontext->Esp += sizeof(ia32_iret_frame);
1975#endif
1976  }
1977  tcr->pending_exception_context = NULL;
1978}
1979
1980Boolean
1981suspend_tcr(TCR *tcr)
1982{
1983  int suspend_count = atomic_incf(&(tcr->suspend_count));
1984  DWORD rc;
1985  if (suspend_count == 1) {
1986    CONTEXT  *pcontext = (CONTEXT *)tcr->native_thread_info;
1987    HANDLE hthread = (HANDLE)(tcr->osid);
1988    pc where;
1989    area *cs = tcr->cs_area;
1990    LispObj foreign_rsp;
1991
1992    if (hthread == NULL) {
1993      return false;
1994    }
1995    rc = SuspendThread(hthread);
1996    if (rc == -1) {
1997      /* If the thread's simply dead, we should handle that here */
1998      return false;
1999    }
2000    pcontext->ContextFlags = CONTEXT_ALL;
2001    rc = GetThreadContext(hthread, pcontext);
2002    if (rc == 0) {
2003      return false;
2004    }
2005    where = (pc)(xpPC(pcontext));
2006
2007    if (tcr->valence == TCR_STATE_LISP) {
2008      if ((where >= restore_windows_context_start) &&
2009          (where < restore_windows_context_end)) {
2010        pc_luser_restore_windows_context(pcontext, tcr, where);
2011      } else {
2012        area *ts = tcr->ts_area;
2013        /* If we're in the lisp heap, or in x86-spentry??.o, or in
2014           x86-subprims??.o, or in the subprims jump table at #x15000,
2015           or on the tstack ... we're just executing lisp code.  Otherwise,
2016           we got an exception while executing lisp code, but haven't
2017           entered the handler yet (still in Windows exception glue
2018           or switching stacks or something.)  In the latter case, we
2019           basically want to get to he handler and have it notice
2020           the pending exception request, and suspend the thread at that
2021           point. */
2022        if (!((where < (pc)lisp_global(HEAP_END)) &&
2023              (where >= (pc)lisp_global(HEAP_START))) &&
2024            !((where < spentry_end) && (where >= spentry_start)) &&
2025            !((where < subprims_end) && (where >= subprims_start)) &&
2026            !((where < (pc) 0x16000) &&
2027              (where >= (pc) 0x15000)) &&
2028            !((where < (pc) (ts->high)) &&
2029              (where >= (pc) (ts->low)))) {
2030          /* The thread has lisp valence, but is not executing code
2031             where we expect lisp code to be and is not exiting from
2032             an exception handler.  That pretty much means that it's
2033             on its way into an exception handler; we have to handshake
2034             until it enters an exception-wait state. */
2035          /* There are likely race conditions here */
2036          SET_TCR_FLAG(tcr,TCR_FLAG_BIT_PENDING_SUSPEND);
2037          ResumeThread(hthread);
2038          SEM_WAIT_FOREVER(tcr->suspend);
2039          SuspendThread(hthread);
2040          /* The thread is either waiting for its resume semaphore to
2041             be signaled or is about to wait.  Signal it now, while
2042             the thread's suspended. */
2043          SEM_RAISE(tcr->resume);
2044          pcontext->ContextFlags = CONTEXT_ALL;
2045          GetThreadContext(hthread, pcontext);
2046        }
2047      }
2048#if 0
2049    } else {
2050      if (tcr->valence == TCR_STATE_EXCEPTION_RETURN) {
2051        if (!tcr->pending_exception_context) {
2052          FBug(pcontext, "we're confused here.");
2053        }
2054        *pcontext = *tcr->pending_exception_context;
2055        tcr->pending_exception_context = NULL;
2056        tcr->valence = TCR_STATE_LISP;
2057      }
2058#endif
2059    }
2060    tcr->suspend_context = pcontext;
2061    return true;
2062  }
2063  return false;
2064}
2065#else
2066Boolean
2067suspend_tcr(TCR *tcr)
2068{
2069  int suspend_count = atomic_incf(&(tcr->suspend_count));
2070  pthread_t thread;
2071  if (suspend_count == 1) {
2072    thread = (pthread_t)(tcr->osid);
2073    if ((thread != (pthread_t) 0) &&
2074        (pthread_kill(thread, thread_suspend_signal) == 0)) {
2075      SET_TCR_FLAG(tcr,TCR_FLAG_BIT_SUSPEND_ACK_PENDING);
2076    } else {
2077      /* A problem using pthread_kill.  On Darwin, this can happen
2078         if the thread has had its signal mask surgically removed
2079         by pthread_exit.  If the native (Mach) thread can be suspended,
2080         do that and return true; otherwise, flag the tcr as belonging
2081         to a dead thread by setting tcr->osid to 0.
2082      */
2083      tcr->osid = 0;
2084      return false;
2085    }
2086    return true;
2087  }
2088  return false;
2089}
2090#endif
2091
2092#ifdef WINDOWS
2093Boolean
2094tcr_suspend_ack(TCR *tcr)
2095{
2096  return true;
2097}
2098#else
2099Boolean
2100tcr_suspend_ack(TCR *tcr)
2101{
2102  if (tcr->flags & (1<<TCR_FLAG_BIT_SUSPEND_ACK_PENDING)) {
2103    SEM_WAIT_FOREVER(tcr->suspend);
2104    tcr->flags &= ~(1<<TCR_FLAG_BIT_SUSPEND_ACK_PENDING);
2105  }
2106  return true;
2107}
2108#endif
2109     
2110
2111Boolean
2112kill_tcr(TCR *tcr)
2113{
2114  TCR *current = get_tcr(true);
2115  Boolean result = false;
2116
2117  LOCK(lisp_global(TCR_AREA_LOCK),current);
2118  {
2119    LispObj osid = tcr->osid;
2120   
2121    if (osid) {
2122      result = true;
2123#ifdef WINDOWS
2124      /* What we really want to de hear is (something like)
2125         forcing the thread to run quit_handler().  For now,
2126         mark the TCR as dead and kill thw Windows thread. */
2127      tcr->osid = 0;
2128      if (!TerminateThread((HANDLE)osid, 0)) {
2129        result = false;
2130      } else {
2131        shutdown_thread_tcr(tcr);
2132      }
2133#else
2134      if (pthread_kill((pthread_t)osid,thread_kill_signal)) {
2135        result = false;
2136      }
2137#endif
2138    }
2139  }
2140  UNLOCK(lisp_global(TCR_AREA_LOCK), current);
2141  return result;
2142}
2143
2144Boolean
2145lisp_suspend_tcr(TCR *tcr)
2146{
2147  Boolean suspended;
2148  TCR *current = get_tcr(true);
2149 
2150  LOCK(lisp_global(TCR_AREA_LOCK),current);
2151  suspended = suspend_tcr(tcr);
2152  if (suspended) {
2153    while (!tcr_suspend_ack(tcr));
2154  }
2155  UNLOCK(lisp_global(TCR_AREA_LOCK),current);
2156  return suspended;
2157}
2158         
2159#ifdef WINDOWS
2160Boolean
2161resume_tcr(TCR *tcr)
2162{
2163  int suspend_count = atomic_decf(&(tcr->suspend_count)), err;
2164  DWORD rc;
2165  if (suspend_count == 0) {
2166    CONTEXT *context = tcr->suspend_context;
2167    HANDLE hthread = (HANDLE)(tcr->osid);
2168
2169    if (context) {
2170      context->ContextFlags = CONTEXT_ALL;
2171      tcr->suspend_context = NULL;
2172      SetThreadContext(hthread,context);
2173      rc = ResumeThread(hthread);
2174      if (rc == -1) {
2175        wperror("ResumeThread");
2176        return false;
2177      }
2178      return true;
2179    }
2180  }
2181  return false;
2182}   
2183#else
2184Boolean
2185resume_tcr(TCR *tcr)
2186{
2187  int suspend_count = atomic_decf(&(tcr->suspend_count));
2188  if (suspend_count == 0) {
2189    void *s = (tcr->resume);
2190    if (s != NULL) {
2191      SEM_RAISE(s);
2192      return true;
2193    }
2194  }
2195  return false;
2196}
2197#endif
2198
2199   
2200
2201
2202Boolean
2203lisp_resume_tcr(TCR *tcr)
2204{
2205  Boolean resumed;
2206  TCR *current = get_tcr(true);
2207 
2208  LOCK(lisp_global(TCR_AREA_LOCK),current);
2209  resumed = resume_tcr(tcr);
2210  UNLOCK(lisp_global(TCR_AREA_LOCK), current);
2211  return resumed;
2212}
2213
2214
2215TCR *freed_tcrs = NULL;
2216
2217void
2218enqueue_freed_tcr (TCR *tcr)
2219{
2220#ifndef HAVE_TLS
2221  tcr->next = freed_tcrs;
2222  freed_tcrs = tcr;
2223#endif
2224}
2225
2226/* It's not clear that we can safely condemn a dead tcr's areas, since
2227   we may not be able to call free() if a suspended thread owns a
2228   malloc lock. At least make the areas appear to be empty.
2229*/
2230   
2231
2232void
2233normalize_dead_tcr_areas(TCR *tcr)
2234{
2235  area *a;
2236
2237  a = tcr->vs_area;
2238  if (a) {
2239    a->active = a->high;
2240  }
2241
2242  a = tcr->ts_area;
2243  if (a) {
2244    a->active = a->high;
2245  }
2246
2247  a = tcr->cs_area;
2248  if (a) {
2249    a->active = a->high;
2250  }
2251}
2252   
2253void
2254free_freed_tcrs ()
2255{
2256  TCR *current, *next;
2257
2258  for (current = freed_tcrs; current; current = next) {
2259    next = current->next;
2260#ifndef HAVE_TLS
2261#ifdef WIN32
2262    free(current->allocated);
2263#else
2264    free(current);
2265#endif
2266#endif
2267  }
2268  freed_tcrs = NULL;
2269}
2270
2271void
2272suspend_other_threads(Boolean for_gc)
2273{
2274  TCR *current = get_tcr(true), *other, *next;
2275  int dead_tcr_count = 0;
2276  Boolean all_acked;
2277
2278  LOCK(lisp_global(TCR_AREA_LOCK), current);
2279  for (other = current->next; other != current; other = other->next) {
2280    if ((other->osid != 0)) {
2281      suspend_tcr(other);
2282      if (other->osid == 0) {
2283        dead_tcr_count++;
2284      }
2285    } else {
2286      dead_tcr_count++;
2287    }
2288  }
2289
2290  do {
2291    all_acked = true;
2292    for (other = current->next; other != current; other = other->next) {
2293      if ((other->osid != 0)) {
2294        if (!tcr_suspend_ack(other)) {
2295          all_acked = false;
2296        }
2297      }
2298    }
2299  } while(! all_acked);
2300
2301     
2302
2303  /* All other threads are suspended; can safely delete dead tcrs now */
2304  if (dead_tcr_count) {
2305    for (other = current->next; other != current; other = next) {
2306      next = other->next;
2307      if ((other->osid == 0))  {
2308        normalize_dead_tcr_areas(other);
2309        dequeue_tcr(other);
2310        enqueue_freed_tcr(other);
2311      }
2312    }
2313  }
2314}
2315
2316void
2317lisp_suspend_other_threads()
2318{
2319  suspend_other_threads(false);
2320}
2321
2322void
2323resume_other_threads(Boolean for_gc)
2324{
2325  TCR *current = get_tcr(true), *other;
2326  for (other = current->next; other != current; other = other->next) {
2327    if ((other->osid != 0)) {
2328      resume_tcr(other);
2329    }
2330  }
2331  free_freed_tcrs();
2332  UNLOCK(lisp_global(TCR_AREA_LOCK), current);
2333}
2334
2335void
2336lisp_resume_other_threads()
2337{
2338  resume_other_threads(false);
2339}
2340
2341
2342
2343rwlock *
2344rwlock_new()
2345{
2346  extern int cache_block_size;
2347
2348  void *p = calloc(1,sizeof(rwlock)+cache_block_size-1);
2349  rwlock *rw = NULL;;
2350 
2351  if (p) {
2352    rw = (rwlock *) ((((natural)p)+cache_block_size-1) & (~(cache_block_size-1)));
2353    rw->malloced_ptr = p;
2354#ifndef USE_FUTEX
2355    rw->reader_signal = new_semaphore(0);
2356    rw->writer_signal = new_semaphore(0);
2357    if ((rw->reader_signal == NULL) || (rw->writer_signal == NULL)) {
2358      if (rw->reader_signal) {
2359        destroy_semaphore(&(rw->reader_signal));
2360      } else {
2361        destroy_semaphore(&(rw->writer_signal));
2362      }
2363      free(rw);
2364      rw = NULL;
2365    }
2366#endif
2367  }
2368  return rw;
2369}
2370
2371     
2372/*
2373  Try to get read access to a multiple-readers/single-writer lock.  If
2374  we already have read access, return success (indicating that the
2375  lock is held another time.  If we already have write access to the
2376  lock ... that won't work; return EDEADLK.  Wait until no other
2377  thread has or is waiting for write access, then indicate that we
2378  hold read access once.
2379*/
2380#ifndef USE_FUTEX
2381int
2382rwlock_rlock(rwlock *rw, TCR *tcr, struct timespec *waitfor)
2383{
2384  int err = 0;
2385 
2386  LOCK_SPINLOCK(rw->spin, tcr);
2387
2388  if (rw->writer == tcr) {
2389    RELEASE_SPINLOCK(rw->spin);
2390    return EDEADLK;
2391  }
2392
2393  while (rw->blocked_writers || (rw->state > 0)) {
2394    rw->blocked_readers++;
2395    RELEASE_SPINLOCK(rw->spin);
2396    err = semaphore_maybe_timedwait(rw->reader_signal,waitfor);
2397    LOCK_SPINLOCK(rw->spin,tcr);
2398    rw->blocked_readers--;
2399    if (err == EINTR) {
2400      err = 0;
2401    }
2402    if (err) {
2403      RELEASE_SPINLOCK(rw->spin);
2404      return err;
2405    }
2406  }
2407  rw->state--;
2408  RELEASE_SPINLOCK(rw->spin);
2409  return err;
2410}
2411#else
2412int
2413rwlock_rlock(rwlock *rw, TCR *tcr, struct timespec *waitfor)
2414{
2415  natural waitval;
2416
2417  lock_futex(&rw->spin);
2418
2419  if (rw->writer == tcr) {
2420    unlock_futex(&rw->spin);
2421    return EDEADLOCK;
2422  }
2423  while (1) {
2424    if (rw->writer == NULL) {
2425      --rw->state;
2426      unlock_futex(&rw->spin);
2427      return 0;
2428    }
2429    rw->blocked_readers++;
2430    waitval = rw->reader_signal;
2431    unlock_futex(&rw->spin);
2432    futex_wait(&rw->reader_signal,waitval);
2433    lock_futex(&rw->spin);
2434    rw->blocked_readers--;
2435  }
2436  return 0;
2437}
2438#endif   
2439
2440
2441/*
2442  Try to obtain write access to the lock.
2443  It is an error if we already have read access, but it's hard to
2444  detect that.
2445  If we already have write access, increment the count that indicates
2446  that.
2447  Otherwise, wait until the lock is not held for reading or writing,
2448  then assert write access.
2449*/
2450
2451#ifndef USE_FUTEX
2452int
2453rwlock_wlock(rwlock *rw, TCR *tcr, struct timespec *waitfor)
2454{
2455  int err = 0;
2456
2457  LOCK_SPINLOCK(rw->spin,tcr);
2458  if (rw->writer == tcr) {
2459    rw->state++;
2460    RELEASE_SPINLOCK(rw->spin);
2461    return 0;
2462  }
2463
2464  while (rw->state != 0) {
2465    rw->blocked_writers++;
2466    RELEASE_SPINLOCK(rw->spin);
2467    err = semaphore_maybe_timedwait(rw->writer_signal, waitfor);
2468    LOCK_SPINLOCK(rw->spin,tcr);
2469    rw->blocked_writers--;
2470    if (err == EINTR) {
2471      err = 0;
2472    }
2473    if (err) {
2474      RELEASE_SPINLOCK(rw->spin);
2475      return err;
2476    }
2477  }
2478  rw->state = 1;
2479  rw->writer = tcr;
2480  RELEASE_SPINLOCK(rw->spin);
2481  return err;
2482}
2483
2484#else
2485int
2486rwlock_wlock(rwlock *rw, TCR *tcr, struct timespec *waitfor)
2487{
2488  int err = 0;
2489  natural waitval;
2490
2491  lock_futex(&rw->spin);
2492  if (rw->writer == tcr) {
2493    rw->state++;
2494    unlock_futex(&rw->spin);
2495    return 0;
2496  }
2497
2498  while (rw->state != 0) {
2499    rw->blocked_writers++;
2500    waitval = rw->writer_signal;
2501    unlock_futex(&rw->spin);
2502    futex_wait(&rw->writer_signal,waitval);
2503    lock_futex(&rw->spin);
2504    rw->blocked_writers--;
2505  }
2506  rw->state = 1;
2507  rw->writer = tcr;
2508  unlock_futex(&rw->spin);
2509  return err;
2510}
2511#endif
2512
2513/*
2514  Sort of the same as above, only return EBUSY if we'd have to wait.
2515*/
2516#ifndef USE_FUTEX
2517int
2518rwlock_try_wlock(rwlock *rw, TCR *tcr)
2519{
2520  int ret = EBUSY;
2521
2522  LOCK_SPINLOCK(rw->spin,tcr);
2523  if (rw->writer == tcr) {
2524    rw->state++;
2525    ret = 0;
2526  } else {
2527    if (rw->state == 0) {
2528      rw->writer = tcr;
2529      rw->state = 1;
2530      ret = 0;
2531    }
2532  }
2533  RELEASE_SPINLOCK(rw->spin);
2534  return ret;
2535}
2536#else
2537int
2538rwlock_try_wlock(rwlock *rw, TCR *tcr)
2539{
2540  int ret = EBUSY;
2541
2542  lock_futex(&rw->spin);
2543  if (rw->writer == tcr) {
2544    rw->state++;
2545    ret = 0;
2546  } else {
2547    if (rw->state == 0) {
2548      rw->writer = tcr;
2549      rw->state = 1;
2550      ret = 0;
2551    }
2552  }
2553  unlock_futex(&rw->spin);
2554  return ret;
2555}
2556#endif
2557
2558#ifndef USE_FUTEX
2559int
2560rwlock_try_rlock(rwlock *rw, TCR *tcr)
2561{
2562  int ret = EBUSY;
2563
2564  LOCK_SPINLOCK(rw->spin,tcr);
2565  if (rw->state <= 0) {
2566    --rw->state;
2567    ret = 0;
2568  }
2569  RELEASE_SPINLOCK(rw->spin);
2570  return ret;
2571}
2572#else
2573int
2574rwlock_try_rlock(rwlock *rw, TCR *tcr)
2575{
2576  int ret = EBUSY;
2577
2578  lock_futex(&rw->spin);
2579  if (rw->state <= 0) {
2580    --rw->state;
2581    ret = 0;
2582  }
2583  unlock_futex(&rw->spin);
2584  return ret;
2585}
2586#endif
2587
2588
2589
2590#ifndef USE_FUTEX
2591int
2592rwlock_unlock(rwlock *rw, TCR *tcr)
2593{
2594
2595  int err = 0;
2596  natural blocked_readers = 0;
2597
2598  LOCK_SPINLOCK(rw->spin,tcr);
2599  if (rw->state > 0) {
2600    if (rw->writer != tcr) {
2601      err = EINVAL;
2602    } else {
2603      --rw->state;
2604      if (rw->state == 0) {
2605        rw->writer = NULL;
2606      }
2607    }
2608  } else {
2609    if (rw->state < 0) {
2610      ++rw->state;
2611    } else {
2612      err = EINVAL;
2613    }
2614  }
2615  if (err) {
2616    RELEASE_SPINLOCK(rw->spin);
2617    return err;
2618  }
2619 
2620  if (rw->state == 0) {
2621    if (rw->blocked_writers) {
2622      SEM_RAISE(rw->writer_signal);
2623    } else {
2624      blocked_readers = rw->blocked_readers;
2625      if (blocked_readers) {
2626        SEM_BROADCAST(rw->reader_signal, blocked_readers);
2627      }
2628    }
2629  }
2630  RELEASE_SPINLOCK(rw->spin);
2631  return 0;
2632}
2633#else
2634int
2635rwlock_unlock(rwlock *rw, TCR *tcr)
2636{
2637
2638  int err = 0;
2639
2640  lock_futex(&rw->spin);
2641  if (rw->state > 0) {
2642    if (rw->writer != tcr) {
2643      err = EINVAL;
2644    } else {
2645      --rw->state;
2646      if (rw->state == 0) {
2647        rw->writer = NULL;
2648      }
2649    }
2650  } else {
2651    if (rw->state < 0) {
2652      ++rw->state;
2653    } else {
2654      err = EINVAL;
2655    }
2656  }
2657  if (err) {
2658    unlock_futex(&rw->spin);
2659    return err;
2660  }
2661 
2662  if (rw->state == 0) {
2663    if (rw->blocked_writers) {
2664      ++rw->writer_signal;
2665      unlock_futex(&rw->spin);
2666      futex_wake(&rw->writer_signal,1);
2667      return 0;
2668    }
2669    if (rw->blocked_readers) {
2670      ++rw->reader_signal;
2671      unlock_futex(&rw->spin);
2672      futex_wake(&rw->reader_signal, INT_MAX);
2673      return 0;
2674    }
2675  }
2676  unlock_futex(&rw->spin);
2677  return 0;
2678}
2679#endif
2680
2681       
2682void
2683rwlock_destroy(rwlock *rw)
2684{
2685#ifndef USE_FUTEX
2686  destroy_semaphore((void **)&rw->reader_signal);
2687  destroy_semaphore((void **)&rw->writer_signal);
2688#endif
2689  postGCfree((void *)(rw->malloced_ptr));
2690}
2691
2692
2693
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