source: release/1.3/source/lisp-kernel/thread_manager.c @ 12772

Last change on this file since 12772 was 12772, checked in by gb, 10 years ago

Propagate r12475 (fix for ticket:571 - don't short-circuit Windows
exception return in suspend_tcr()) to 1.3 tree.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 57.2 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  void *termination_semaphore;
1384 
1385  if (current == NULL) {
1386    current = tcr;
1387  }
1388
1389  if (--(tcr->shutdown_count) == 0) {
1390    if (tcr->flags & (1<<TCR_FLAG_BIT_FOREIGN)) {
1391      LispObj callback_macptr = nrs_FOREIGN_THREAD_CONTROL.vcell,
1392        callback_ptr = ((macptr *)ptr_from_lispobj(untag(callback_macptr)))->address;
1393   
1394      tsd_set(lisp_global(TCR_KEY), TCR_TO_TSD(tcr));
1395      ((void (*)())ptr_from_lispobj(callback_ptr))(1);
1396      tsd_set(lisp_global(TCR_KEY), NULL);
1397    }
1398#ifdef DARWIN
1399    darwin_exception_cleanup(tcr);
1400#endif
1401    LOCK(lisp_global(TCR_AREA_LOCK),current);
1402    vs = tcr->vs_area;
1403    tcr->vs_area = NULL;
1404    ts = tcr->ts_area;
1405    tcr->ts_area = NULL;
1406    cs = tcr->cs_area;
1407    tcr->cs_area = NULL;
1408    if (vs) {
1409      condemn_area_holding_area_lock(vs);
1410    }
1411    if (ts) {
1412      condemn_area_holding_area_lock(ts);
1413    }
1414    if (cs) {
1415      condemn_area_holding_area_lock(cs);
1416    }
1417    destroy_semaphore(&tcr->suspend);
1418    destroy_semaphore(&tcr->resume);
1419    destroy_semaphore(&tcr->reset_completion);
1420    destroy_semaphore(&tcr->activate);
1421    tcr->tlb_limit = 0;
1422    free(tcr->tlb_pointer);
1423    tcr->tlb_pointer = NULL;
1424    tcr->osid = 0;
1425    tcr->interrupt_pending = 0;
1426    termination_semaphore = tcr->termination_semaphore;
1427    tcr->termination_semaphore = NULL;
1428#ifdef HAVE_TLS
1429    dequeue_tcr(tcr);
1430#endif
1431#ifdef X8632
1432    free_tcr_extra_segment(tcr);
1433#endif
1434#ifdef WIN32
1435    CloseHandle((HANDLE)tcr->io_datum);
1436    tcr->io_datum = NULL;
1437    free(tcr->native_thread_info);
1438    tcr->native_thread_info = NULL;
1439#endif
1440    UNLOCK(lisp_global(TCR_AREA_LOCK),current);
1441    if (termination_semaphore) {
1442      SEM_RAISE(termination_semaphore);
1443    }
1444  } else {
1445    tsd_set(lisp_global(TCR_KEY), TCR_TO_TSD(tcr));
1446  }
1447}
1448
1449void
1450tcr_cleanup(void *arg)
1451{
1452  TCR *tcr = (TCR *)arg;
1453  area *a;
1454
1455  a = tcr->vs_area;
1456  if (a) {
1457    a->active = a->high;
1458  }
1459  a = tcr->ts_area;
1460  if (a) {
1461    a->active = a->high;
1462  }
1463  a = tcr->cs_area;
1464  if (a) {
1465    a->active = a->high;
1466  }
1467  tcr->valence = TCR_STATE_FOREIGN;
1468  tcr->shutdown_count = 1;
1469  shutdown_thread_tcr(tcr);
1470  tsd_set(lisp_global(TCR_KEY), NULL);
1471}
1472
1473void *
1474current_native_thread_id()
1475{
1476  return ((void *) (natural)
1477#ifdef LINUX
1478#ifdef __NR_gettid
1479          syscall(__NR_gettid)
1480#else
1481          getpid()
1482#endif
1483#endif
1484#ifdef DARWIN
1485          mach_thread_self()
1486#endif
1487#ifdef FREEBSD
1488          pthread_self()
1489#endif
1490#ifdef SOLARIS
1491          pthread_self()
1492#endif
1493#ifdef WINDOWS
1494          GetCurrentThreadId()
1495#endif
1496          );
1497}
1498
1499
1500void
1501thread_init_tcr(TCR *tcr, void *stack_base, natural stack_size)
1502{
1503  area *a, *register_cstack_holding_area_lock(BytePtr, natural);
1504
1505  tcr->osid = current_thread_osid();
1506  tcr->native_thread_id = current_native_thread_id();
1507  LOCK(lisp_global(TCR_AREA_LOCK),tcr);
1508  a = register_cstack_holding_area_lock((BytePtr)stack_base, stack_size);
1509  UNLOCK(lisp_global(TCR_AREA_LOCK),tcr);
1510  tcr->cs_area = a;
1511  a->owner = tcr;
1512  if (!(tcr->flags & (1<<TCR_FLAG_BIT_FOREIGN))) {
1513    tcr->cs_limit = (LispObj)ptr_to_lispobj(a->softlimit);
1514  }
1515#ifdef LINUX
1516#ifdef PPC
1517#ifndef PPC64
1518  tcr->native_thread_info = current_r2;
1519#endif
1520#endif
1521#endif
1522  tcr->errno_loc = &errno;
1523  tsd_set(lisp_global(TCR_KEY), TCR_TO_TSD(tcr));
1524#ifdef DARWIN
1525  extern Boolean use_mach_exception_handling;
1526  if (use_mach_exception_handling) {
1527    darwin_exception_init(tcr);
1528  }
1529#endif
1530#ifdef LINUX
1531  linux_exception_init(tcr);
1532#endif
1533#ifdef WINDOWS
1534  tcr->io_datum = (VOID *)CreateEvent(NULL, true, false, NULL);
1535  tcr->native_thread_info = malloc(sizeof(CONTEXT));
1536#endif
1537  tcr->log2_allocation_quantum = unbox_fixnum(lisp_global(DEFAULT_ALLOCATION_QUANTUM));
1538}
1539
1540/*
1541  Register the specified tcr as "belonging to" the current thread.
1542  Under Darwin, setup Mach exception handling for the thread.
1543  Install cleanup handlers for thread termination.
1544*/
1545void
1546register_thread_tcr(TCR *tcr)
1547{
1548  void *stack_base = NULL;
1549  natural stack_size = 0;
1550
1551  os_get_current_thread_stack_bounds(&stack_base, &stack_size);
1552  thread_init_tcr(tcr, stack_base, stack_size);
1553  enqueue_tcr(tcr);
1554}
1555
1556
1557 
1558 
1559#ifndef MAP_GROWSDOWN
1560#define MAP_GROWSDOWN 0
1561#endif
1562
1563Ptr
1564create_stack(natural size)
1565{
1566  Ptr p;
1567  size=align_to_power_of_2(size, log2_page_size);
1568  p = (Ptr) MapMemoryForStack((size_t)size);
1569  if (p != (Ptr)(-1)) {
1570    *((size_t *)p) = size;
1571    return p;
1572  }
1573  allocation_failure(true, size);
1574
1575}
1576
1577void *
1578allocate_stack(natural size)
1579{
1580  return create_stack(size);
1581}
1582
1583void
1584free_stack(void *s)
1585{
1586  size_t size = *((size_t *)s);
1587  UnMapMemory(s, size);
1588}
1589
1590Boolean threads_initialized = false;
1591
1592#ifndef USE_FUTEX
1593#ifdef WINDOWS
1594void
1595count_cpus()
1596{
1597  SYSTEM_INFO si;
1598
1599  GetSystemInfo(&si);
1600  if (si.dwNumberOfProcessors > 1) {
1601    spin_lock_tries = 1024;
1602  }
1603}
1604#else
1605void
1606count_cpus()
1607{
1608#ifdef DARWIN
1609  /* As of OSX 10.4, Darwin doesn't define _SC_NPROCESSORS_ONLN */
1610#include <mach/host_info.h>
1611
1612  struct host_basic_info info;
1613  mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
1614 
1615  if (KERN_SUCCESS == host_info(mach_host_self(), HOST_BASIC_INFO,(host_info_t)(&info),&count)) {
1616    if (info.max_cpus > 1) {
1617      spin_lock_tries = 1024;
1618    }
1619  }
1620#else
1621  int n = sysconf(_SC_NPROCESSORS_ONLN);
1622 
1623  if (n > 1) {
1624    spin_lock_tries = 1024;
1625  }
1626#endif
1627}
1628#endif
1629#endif
1630
1631void
1632init_threads(void * stack_base, TCR *tcr)
1633{
1634  lisp_global(INITIAL_TCR) = (LispObj)ptr_to_lispobj(tcr);
1635#ifdef WINDOWS
1636  lisp_global(TCR_KEY) = TlsAlloc();
1637  pCancelIoEx = windows_find_symbol(NULL, "CancelIoEx");
1638  pCancelSynchronousIo = windows_find_symbol(NULL, "CancelSynchronousIo");
1639#else
1640  pthread_key_create((pthread_key_t *)&(lisp_global(TCR_KEY)), shutdown_thread_tcr);
1641  thread_signal_setup();
1642#endif
1643
1644#ifndef USE_FUTEX
1645  count_cpus();
1646#endif
1647  threads_initialized = true;
1648}
1649
1650
1651#ifdef WINDOWS
1652unsigned CALLBACK
1653#else
1654void *
1655#endif
1656lisp_thread_entry(void *param)
1657{
1658  thread_activation *activation = (thread_activation *)param;
1659  TCR *tcr = new_tcr(activation->vsize, activation->tsize);
1660  LispObj *start_vsp;
1661#ifndef WINDOWS
1662  sigset_t mask, old_mask;
1663
1664  sigemptyset(&mask);
1665  pthread_sigmask(SIG_SETMASK, &mask, &old_mask);
1666#endif
1667
1668  register_thread_tcr(tcr);
1669
1670#ifndef WINDOWS
1671  pthread_cleanup_push(tcr_cleanup,(void *)tcr);
1672#endif
1673  tcr->vs_area->active -= node_size;
1674  *(--tcr->save_vsp) = lisp_nil;
1675  start_vsp = tcr->save_vsp;
1676  enable_fp_exceptions();
1677  SET_TCR_FLAG(tcr,TCR_FLAG_BIT_AWAITING_PRESET);
1678  activation->tcr = tcr;
1679  SEM_RAISE(activation->created);
1680  do {
1681    SEM_RAISE(tcr->reset_completion);
1682    SEM_WAIT_FOREVER(tcr->activate);
1683    /* Now go run some lisp code */
1684    start_lisp(TCR_TO_TSD(tcr),0);
1685    tcr->save_vsp = start_vsp;
1686  } while (tcr->flags & (1<<TCR_FLAG_BIT_AWAITING_PRESET));
1687#ifndef WINDOWS
1688  pthread_cleanup_pop(true);
1689#else
1690  tcr_cleanup(tcr);
1691#endif
1692#ifdef WINDOWS
1693  return 0;
1694#else
1695  return NULL;
1696#endif
1697}
1698
1699void *
1700xNewThread(natural control_stack_size,
1701           natural value_stack_size,
1702           natural temp_stack_size)
1703
1704{
1705  thread_activation activation;
1706
1707
1708  activation.tsize = temp_stack_size;
1709  activation.vsize = value_stack_size;
1710  activation.tcr = 0;
1711  activation.created = new_semaphore(0);
1712  if (create_system_thread(control_stack_size +(CSTACK_HARDPROT+CSTACK_SOFTPROT), 
1713                           NULL, 
1714                           lisp_thread_entry,
1715                           (void *) &activation)) {
1716   
1717    SEM_WAIT_FOREVER(activation.created);       /* Wait until thread's entered its initial function */
1718  }
1719  destroy_semaphore(&activation.created); 
1720  return TCR_TO_TSD(activation.tcr);
1721}
1722
1723Boolean
1724active_tcr_p(TCR *q)
1725{
1726  TCR *head = (TCR *)ptr_from_lispobj(lisp_global(INITIAL_TCR)), *p = head;
1727 
1728  do {
1729    if (p == q) {
1730      return true;
1731    }
1732    p = p->next;
1733  } while (p != head);
1734  return false;
1735}
1736
1737#ifdef WINDOWS
1738OSErr
1739xDisposeThread(TCR *tcr)
1740{
1741  return 0;                     /* I don't think that this is ever called. */
1742}
1743#else
1744OSErr
1745xDisposeThread(TCR *tcr)
1746{
1747  if (tcr != (TCR *)ptr_from_lispobj(lisp_global(INITIAL_TCR))) {
1748    if (active_tcr_p(tcr) && (tcr != get_tcr(false))) {
1749      pthread_cancel((pthread_t)(tcr->osid));
1750      return 0;
1751    }
1752  }
1753  return -50;
1754}
1755#endif
1756
1757OSErr
1758xYieldToThread(TCR *target)
1759{
1760  Bug(NULL, "xYieldToThread ?");
1761  return 0;
1762}
1763 
1764OSErr
1765xThreadCurrentStackSpace(TCR *tcr, unsigned *resultP)
1766{
1767  Bug(NULL, "xThreadCurrentStackSpace ?");
1768  return 0;
1769}
1770
1771
1772#ifdef WINDOWS
1773LispObj
1774create_system_thread(size_t stack_size,
1775                     void* stackaddr,
1776                     unsigned CALLBACK (*start_routine)(void *),
1777                     void* param)
1778{
1779  HANDLE thread_handle;
1780
1781  stack_size = ((stack_size+(((1<<16)-1)))&~((1<<16)-1));
1782
1783  thread_handle = (HANDLE)_beginthreadex(NULL, 
1784                                         0/*stack_size*/,
1785                                         start_routine,
1786                                         param,
1787                                         0, 
1788                                         NULL);
1789
1790  if (thread_handle == NULL) {
1791    wperror("CreateThread");
1792  }
1793  return (LispObj) ptr_to_lispobj(thread_handle);
1794}
1795#else
1796LispObj
1797create_system_thread(size_t stack_size,
1798                     void* stackaddr,
1799                     void* (*start_routine)(void *),
1800                     void* param)
1801{
1802  pthread_attr_t attr;
1803  pthread_t returned_thread = (pthread_t) 0;
1804  TCR *current = get_tcr(true);
1805
1806  pthread_attr_init(&attr);
1807  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 
1808
1809  if (stack_size == MINIMAL_THREAD_STACK_SIZE) {
1810    stack_size = PTHREAD_STACK_MIN;
1811  }
1812
1813  stack_size = ensure_stack_limit(stack_size);
1814  if (stackaddr != NULL) {
1815    /* Size must have been specified.  Sort of makes sense ... */
1816#ifdef DARWIN
1817    Fatal("no pthread_attr_setsetstack. "," Which end of stack does address refer to?");
1818#else
1819    pthread_attr_setstack(&attr, stackaddr, stack_size);
1820#endif
1821  } else if (stack_size != DEFAULT_THREAD_STACK_SIZE) {
1822    pthread_attr_setstacksize(&attr,stack_size);
1823  }
1824
1825  /*
1826     I think that's just about enough ... create the thread.
1827     Well ... not quite enough.  In Leopard (at least), many
1828     pthread routines grab an internal spinlock when validating
1829     their arguments.  If we suspend a thread that owns this
1830     spinlock, we deadlock.  We can't in general keep that
1831     from happening: if arbitrary C code is suspended while
1832     it owns the spinlock, we still deadlock.  It seems that
1833     the best that we can do is to keep -this- code from
1834     getting suspended (by grabbing TCR_AREA_LOCK)
1835  */
1836  LOCK(lisp_global(TCR_AREA_LOCK),current);
1837  pthread_create(&returned_thread, &attr, start_routine, param);
1838  UNLOCK(lisp_global(TCR_AREA_LOCK),current);
1839  pthread_attr_destroy(&attr);
1840  return (LispObj) ptr_to_lispobj(returned_thread);
1841}
1842#endif
1843
1844TCR *
1845get_tcr(Boolean create)
1846{
1847#ifdef HAVE_TLS
1848  TCR *current = current_tcr;
1849#else
1850  void *tsd = (void *)tsd_get(lisp_global(TCR_KEY));
1851  TCR *current = (tsd == NULL) ? NULL : TCR_FROM_TSD(tsd);
1852#endif
1853
1854  if ((current == NULL) && create) {
1855    LispObj callback_macptr = nrs_FOREIGN_THREAD_CONTROL.vcell,
1856      callback_ptr = ((macptr *)ptr_from_lispobj(untag(callback_macptr)))->address;
1857    int i, nbindwords = 0;
1858    extern natural initial_stack_size;
1859   
1860    /* Make one. */
1861    current = new_tcr(initial_stack_size, MIN_TSTACK_SIZE);
1862    SET_TCR_FLAG(current,TCR_FLAG_BIT_FOREIGN);
1863    register_thread_tcr(current);
1864#ifdef DEBUG_TCR_CREATION
1865#ifndef WINDOWS
1866    fprintf(dbgout, "\ncreating TCR for pthread 0x%x", pthread_self());
1867#endif
1868#endif
1869    current->vs_area->active -= node_size;
1870    *(--current->save_vsp) = lisp_nil;
1871#ifdef PPC
1872#define NSAVEREGS 8
1873#endif
1874#ifdef X8664
1875#define NSAVEREGS 4
1876#endif
1877#ifdef X8632
1878#define NSAVEREGS 0
1879#endif
1880    for (i = 0; i < NSAVEREGS; i++) {
1881      *(--current->save_vsp) = 0;
1882      current->vs_area->active -= node_size;
1883    }
1884    nbindwords = ((int (*)())ptr_from_lispobj(callback_ptr))(-1);
1885    for (i = 0; i < nbindwords; i++) {
1886      *(--current->save_vsp) = 0;
1887      current->vs_area->active -= node_size;
1888    }
1889    current->shutdown_count = 1;
1890    ((void (*)())ptr_from_lispobj(callback_ptr))(0);
1891
1892  }
1893 
1894  return current;
1895}
1896
1897#ifdef WINDOWS
1898void *
1899pc_luser_restore_windows_context(CONTEXT *pcontext, TCR *tcr, pc where)
1900{
1901  /* Thread has started to return from an exception. */
1902  if (where < restore_windows_context_iret) {
1903    /* In the process of restoring registers; context still in
1904       %rcx.  Just make our suspend_context be the context
1905       we're trying to restore, so that we'll resume from
1906       the suspend in the same context that we're trying to
1907       restore */
1908#ifdef WIN_64
1909    *pcontext = * (CONTEXT *)(pcontext->Rcx);
1910#else
1911    *pcontext = * (CONTEXT *)(pcontext->Ecx);
1912#endif
1913  } else {
1914    /* Most of the context has already been restored; fix %rcx
1915       if need be, then restore ss:rsp, cs:rip, and flags. */
1916#ifdef WIN_64
1917    x64_iret_frame *iret_frame = (x64_iret_frame *) (pcontext->Rsp);
1918
1919    pcontext->Rip = iret_frame->Rip;
1920    pcontext->SegCs = (WORD) iret_frame->Cs;
1921    pcontext->EFlags = (DWORD) iret_frame->Rflags;
1922    pcontext->Rsp = iret_frame->Rsp;
1923    pcontext->SegSs = (WORD) iret_frame->Ss;
1924#else
1925    ia32_iret_frame *iret_frame = (ia32_iret_frame *) (pcontext->Esp);
1926
1927    pcontext->Eip = iret_frame->Eip;
1928    pcontext->SegCs = (WORD) iret_frame->Cs;
1929    pcontext->EFlags = (DWORD) iret_frame->EFlags;
1930    pcontext->Esp += sizeof(ia32_iret_frame);
1931#endif
1932  }
1933  tcr->pending_exception_context = NULL;
1934}
1935
1936Boolean
1937suspend_tcr(TCR *tcr)
1938{
1939  int suspend_count = atomic_incf(&(tcr->suspend_count));
1940  DWORD rc;
1941  if (suspend_count == 1) {
1942    CONTEXT  *pcontext = (CONTEXT *)tcr->native_thread_info;
1943    HANDLE hthread = (HANDLE)(tcr->osid);
1944    pc where;
1945    area *cs = tcr->cs_area;
1946    LispObj foreign_rsp;
1947
1948    if (hthread == NULL) {
1949      return false;
1950    }
1951    rc = SuspendThread(hthread);
1952    if (rc == -1) {
1953      /* If the thread's simply dead, we should handle that here */
1954      return false;
1955    }
1956    pcontext->ContextFlags = CONTEXT_ALL;
1957    rc = GetThreadContext(hthread, pcontext);
1958    if (rc == 0) {
1959      return false;
1960    }
1961    where = (pc)(xpPC(pcontext));
1962
1963    if (tcr->valence == TCR_STATE_LISP) {
1964      if ((where >= restore_windows_context_start) &&
1965          (where < restore_windows_context_end)) {
1966        pc_luser_restore_windows_context(pcontext, tcr, where);
1967      } else {
1968        area *ts = tcr->ts_area;
1969        /* If we're in the lisp heap, or in x86-spentry??.o, or in
1970           x86-subprims??.o, or in the subprims jump table at #x15000,
1971           or on the tstack ... we're just executing lisp code.  Otherwise,
1972           we got an exception while executing lisp code, but haven't
1973           entered the handler yet (still in Windows exception glue
1974           or switching stacks or something.)  In the latter case, we
1975           basically want to get to he handler and have it notice
1976           the pending exception request, and suspend the thread at that
1977           point. */
1978        if (!((where < (pc)lisp_global(HEAP_END)) &&
1979              (where >= (pc)lisp_global(HEAP_START))) &&
1980            !((where < spentry_end) && (where >= spentry_start)) &&
1981            !((where < subprims_end) && (where >= subprims_start)) &&
1982            !((where < (pc) 0x16000) &&
1983              (where >= (pc) 0x15000)) &&
1984            !((where < (pc) (ts->high)) &&
1985              (where >= (pc) (ts->low)))) {
1986          /* The thread has lisp valence, but is not executing code
1987             where we expect lisp code to be and is not exiting from
1988             an exception handler.  That pretty much means that it's
1989             on its way into an exception handler; we have to handshake
1990             until it enters an exception-wait state. */
1991          /* There are likely race conditions here */
1992          SET_TCR_FLAG(tcr,TCR_FLAG_BIT_PENDING_SUSPEND);
1993          ResumeThread(hthread);
1994          SEM_WAIT_FOREVER(tcr->suspend);
1995          SuspendThread(hthread);
1996          /* The thread is either waiting for its resume semaphore to
1997             be signaled or is about to wait.  Signal it now, while
1998             the thread's suspended. */
1999          SEM_RAISE(tcr->resume);
2000          pcontext->ContextFlags = CONTEXT_ALL;
2001          GetThreadContext(hthread, pcontext);
2002        }
2003      }
2004#if 0
2005    } else {
2006      if (tcr->valence == TCR_STATE_EXCEPTION_RETURN) {
2007        if (!tcr->pending_exception_context) {
2008          FBug(pcontext, "we're confused here.");
2009        }
2010        *pcontext = *tcr->pending_exception_context;
2011        tcr->pending_exception_context = NULL;
2012        tcr->valence = TCR_STATE_LISP;
2013      }
2014#endif
2015    }
2016    tcr->suspend_context = pcontext;
2017    return true;
2018  }
2019  return false;
2020}
2021#else
2022Boolean
2023suspend_tcr(TCR *tcr)
2024{
2025  int suspend_count = atomic_incf(&(tcr->suspend_count));
2026  pthread_t thread;
2027  if (suspend_count == 1) {
2028    thread = (pthread_t)(tcr->osid);
2029    if ((thread != (pthread_t) 0) &&
2030        (pthread_kill(thread, thread_suspend_signal) == 0)) {
2031      SET_TCR_FLAG(tcr,TCR_FLAG_BIT_SUSPEND_ACK_PENDING);
2032    } else {
2033      /* A problem using pthread_kill.  On Darwin, this can happen
2034         if the thread has had its signal mask surgically removed
2035         by pthread_exit.  If the native (Mach) thread can be suspended,
2036         do that and return true; otherwise, flag the tcr as belonging
2037         to a dead thread by setting tcr->osid to 0.
2038      */
2039      tcr->osid = 0;
2040      return false;
2041    }
2042    return true;
2043  }
2044  return false;
2045}
2046#endif
2047
2048#ifdef WINDOWS
2049Boolean
2050tcr_suspend_ack(TCR *tcr)
2051{
2052  return true;
2053}
2054#else
2055Boolean
2056tcr_suspend_ack(TCR *tcr)
2057{
2058  if (tcr->flags & (1<<TCR_FLAG_BIT_SUSPEND_ACK_PENDING)) {
2059    SEM_WAIT_FOREVER(tcr->suspend);
2060    tcr->flags &= ~(1<<TCR_FLAG_BIT_SUSPEND_ACK_PENDING);
2061  }
2062  return true;
2063}
2064#endif
2065     
2066
2067Boolean
2068kill_tcr(TCR *tcr)
2069{
2070  TCR *current = get_tcr(true);
2071  Boolean result = false;
2072
2073  LOCK(lisp_global(TCR_AREA_LOCK),current);
2074  {
2075    LispObj osid = tcr->osid;
2076   
2077    if (osid) {
2078      result = true;
2079#ifdef WINDOWS
2080      /* What we really want to de hear is (something like)
2081         forcing the thread to run quit_handler().  For now,
2082         mark the TCR as dead and kill thw Windows thread. */
2083      tcr->osid = 0;
2084      if (!TerminateThread((HANDLE)osid, 0)) {
2085        result = false;
2086      } else {
2087        shutdown_thread_tcr(tcr);
2088      }
2089#else
2090      if (pthread_kill((pthread_t)osid,thread_kill_signal)) {
2091        result = false;
2092      }
2093#endif
2094    }
2095  }
2096  UNLOCK(lisp_global(TCR_AREA_LOCK), current);
2097  return result;
2098}
2099
2100Boolean
2101lisp_suspend_tcr(TCR *tcr)
2102{
2103  Boolean suspended;
2104  TCR *current = get_tcr(true);
2105 
2106  LOCK(lisp_global(TCR_AREA_LOCK),current);
2107  suspended = suspend_tcr(tcr);
2108  if (suspended) {
2109    while (!tcr_suspend_ack(tcr));
2110  }
2111  UNLOCK(lisp_global(TCR_AREA_LOCK),current);
2112  return suspended;
2113}
2114         
2115#ifdef WINDOWS
2116Boolean
2117resume_tcr(TCR *tcr)
2118{
2119  int suspend_count = atomic_decf(&(tcr->suspend_count)), err;
2120  DWORD rc;
2121  if (suspend_count == 0) {
2122    CONTEXT *context = tcr->suspend_context;
2123    HANDLE hthread = (HANDLE)(tcr->osid);
2124
2125    if (context) {
2126      context->ContextFlags = CONTEXT_ALL;
2127      tcr->suspend_context = NULL;
2128      SetThreadContext(hthread,context);
2129      rc = ResumeThread(hthread);
2130      if (rc == -1) {
2131        wperror("ResumeThread");
2132        return false;
2133      }
2134      return true;
2135    }
2136  }
2137  return false;
2138}   
2139#else
2140Boolean
2141resume_tcr(TCR *tcr)
2142{
2143  int suspend_count = atomic_decf(&(tcr->suspend_count));
2144  if (suspend_count == 0) {
2145    void *s = (tcr->resume);
2146    if (s != NULL) {
2147      SEM_RAISE(s);
2148      return true;
2149    }
2150  }
2151  return false;
2152}
2153#endif
2154
2155   
2156
2157
2158Boolean
2159lisp_resume_tcr(TCR *tcr)
2160{
2161  Boolean resumed;
2162  TCR *current = get_tcr(true);
2163 
2164  LOCK(lisp_global(TCR_AREA_LOCK),current);
2165  resumed = resume_tcr(tcr);
2166  UNLOCK(lisp_global(TCR_AREA_LOCK), current);
2167  return resumed;
2168}
2169
2170
2171TCR *freed_tcrs = NULL;
2172
2173void
2174enqueue_freed_tcr (TCR *tcr)
2175{
2176#ifndef HAVE_TLS
2177  tcr->next = freed_tcrs;
2178  freed_tcrs = tcr;
2179#endif
2180}
2181
2182/* It's not clear that we can safely condemn a dead tcr's areas, since
2183   we may not be able to call free() if a suspended thread owns a
2184   malloc lock. At least make the areas appear to be empty.
2185*/
2186   
2187
2188void
2189normalize_dead_tcr_areas(TCR *tcr)
2190{
2191  area *a;
2192
2193  a = tcr->vs_area;
2194  if (a) {
2195    a->active = a->high;
2196  }
2197
2198  a = tcr->ts_area;
2199  if (a) {
2200    a->active = a->high;
2201  }
2202
2203  a = tcr->cs_area;
2204  if (a) {
2205    a->active = a->high;
2206  }
2207}
2208   
2209void
2210free_freed_tcrs ()
2211{
2212  TCR *current, *next;
2213
2214  for (current = freed_tcrs; current; current = next) {
2215    next = current->next;
2216#ifndef HAVE_TLS
2217#ifdef WIN32
2218    free(current->allocated);
2219#else
2220    free(current);
2221#endif
2222#endif
2223  }
2224  freed_tcrs = NULL;
2225}
2226
2227void
2228suspend_other_threads(Boolean for_gc)
2229{
2230  TCR *current = get_tcr(true), *other, *next;
2231  int dead_tcr_count = 0;
2232  Boolean all_acked;
2233
2234  LOCK(lisp_global(TCR_AREA_LOCK), current);
2235  for (other = current->next; other != current; other = other->next) {
2236    if ((other->osid != 0)) {
2237      suspend_tcr(other);
2238      if (other->osid == 0) {
2239        dead_tcr_count++;
2240      }
2241    } else {
2242      dead_tcr_count++;
2243    }
2244  }
2245
2246  do {
2247    all_acked = true;
2248    for (other = current->next; other != current; other = other->next) {
2249      if ((other->osid != 0)) {
2250        if (!tcr_suspend_ack(other)) {
2251          all_acked = false;
2252        }
2253      }
2254    }
2255  } while(! all_acked);
2256
2257     
2258
2259  /* All other threads are suspended; can safely delete dead tcrs now */
2260  if (dead_tcr_count) {
2261    for (other = current->next; other != current; other = next) {
2262      next = other->next;
2263      if ((other->osid == 0))  {
2264        normalize_dead_tcr_areas(other);
2265        dequeue_tcr(other);
2266        enqueue_freed_tcr(other);
2267      }
2268    }
2269  }
2270}
2271
2272void
2273lisp_suspend_other_threads()
2274{
2275  suspend_other_threads(false);
2276}
2277
2278void
2279resume_other_threads(Boolean for_gc)
2280{
2281  TCR *current = get_tcr(true), *other;
2282  for (other = current->next; other != current; other = other->next) {
2283    if ((other->osid != 0)) {
2284      resume_tcr(other);
2285    }
2286  }
2287  free_freed_tcrs();
2288  UNLOCK(lisp_global(TCR_AREA_LOCK), current);
2289}
2290
2291void
2292lisp_resume_other_threads()
2293{
2294  resume_other_threads(false);
2295}
2296
2297
2298
2299rwlock *
2300rwlock_new()
2301{
2302  extern int cache_block_size;
2303
2304  void *p = calloc(1,sizeof(rwlock)+cache_block_size-1);
2305  rwlock *rw = NULL;;
2306 
2307  if (p) {
2308    rw = (rwlock *) ((((natural)p)+cache_block_size-1) & (~(cache_block_size-1)));
2309    rw->malloced_ptr = p;
2310#ifndef USE_FUTEX
2311    rw->reader_signal = new_semaphore(0);
2312    rw->writer_signal = new_semaphore(0);
2313    if ((rw->reader_signal == NULL) || (rw->writer_signal == NULL)) {
2314      if (rw->reader_signal) {
2315        destroy_semaphore(&(rw->reader_signal));
2316      } else {
2317        destroy_semaphore(&(rw->writer_signal));
2318      }
2319      free(rw);
2320      rw = NULL;
2321    }
2322#endif
2323  }
2324  return rw;
2325}
2326
2327     
2328/*
2329  Try to get read access to a multiple-readers/single-writer lock.  If
2330  we already have read access, return success (indicating that the
2331  lock is held another time.  If we already have write access to the
2332  lock ... that won't work; return EDEADLK.  Wait until no other
2333  thread has or is waiting for write access, then indicate that we
2334  hold read access once.
2335*/
2336#ifndef USE_FUTEX
2337int
2338rwlock_rlock(rwlock *rw, TCR *tcr, struct timespec *waitfor)
2339{
2340  int err = 0;
2341 
2342  LOCK_SPINLOCK(rw->spin, tcr);
2343
2344  if (rw->writer == tcr) {
2345    RELEASE_SPINLOCK(rw->spin);
2346    return EDEADLK;
2347  }
2348
2349  while (rw->blocked_writers || (rw->state > 0)) {
2350    rw->blocked_readers++;
2351    RELEASE_SPINLOCK(rw->spin);
2352    err = semaphore_maybe_timedwait(rw->reader_signal,waitfor);
2353    LOCK_SPINLOCK(rw->spin,tcr);
2354    rw->blocked_readers--;
2355    if (err == EINTR) {
2356      err = 0;
2357    }
2358    if (err) {
2359      RELEASE_SPINLOCK(rw->spin);
2360      return err;
2361    }
2362  }
2363  rw->state--;
2364  RELEASE_SPINLOCK(rw->spin);
2365  return err;
2366}
2367#else
2368int
2369rwlock_rlock(rwlock *rw, TCR *tcr, struct timespec *waitfor)
2370{
2371  natural waitval;
2372
2373  lock_futex(&rw->spin);
2374
2375  if (rw->writer == tcr) {
2376    unlock_futex(&rw->spin);
2377    return EDEADLOCK;
2378  }
2379  while (1) {
2380    if (rw->writer == NULL) {
2381      --rw->state;
2382      unlock_futex(&rw->spin);
2383      return 0;
2384    }
2385    rw->blocked_readers++;
2386    waitval = rw->reader_signal;
2387    unlock_futex(&rw->spin);
2388    futex_wait(&rw->reader_signal,waitval);
2389    lock_futex(&rw->spin);
2390    rw->blocked_readers--;
2391  }
2392  return 0;
2393}
2394#endif   
2395
2396
2397/*
2398  Try to obtain write access to the lock.
2399  It is an error if we already have read access, but it's hard to
2400  detect that.
2401  If we already have write access, increment the count that indicates
2402  that.
2403  Otherwise, wait until the lock is not held for reading or writing,
2404  then assert write access.
2405*/
2406
2407#ifndef USE_FUTEX
2408int
2409rwlock_wlock(rwlock *rw, TCR *tcr, struct timespec *waitfor)
2410{
2411  int err = 0;
2412
2413  LOCK_SPINLOCK(rw->spin,tcr);
2414  if (rw->writer == tcr) {
2415    rw->state++;
2416    RELEASE_SPINLOCK(rw->spin);
2417    return 0;
2418  }
2419
2420  while (rw->state != 0) {
2421    rw->blocked_writers++;
2422    RELEASE_SPINLOCK(rw->spin);
2423    err = semaphore_maybe_timedwait(rw->writer_signal, waitfor);
2424    LOCK_SPINLOCK(rw->spin,tcr);
2425    rw->blocked_writers--;
2426    if (err == EINTR) {
2427      err = 0;
2428    }
2429    if (err) {
2430      RELEASE_SPINLOCK(rw->spin);
2431      return err;
2432    }
2433  }
2434  rw->state = 1;
2435  rw->writer = tcr;
2436  RELEASE_SPINLOCK(rw->spin);
2437  return err;
2438}
2439
2440#else
2441int
2442rwlock_wlock(rwlock *rw, TCR *tcr, struct timespec *waitfor)
2443{
2444  int err = 0;
2445  natural waitval;
2446
2447  lock_futex(&rw->spin);
2448  if (rw->writer == tcr) {
2449    rw->state++;
2450    unlock_futex(&rw->spin);
2451    return 0;
2452  }
2453
2454  while (rw->state != 0) {
2455    rw->blocked_writers++;
2456    waitval = rw->writer_signal;
2457    unlock_futex(&rw->spin);
2458    futex_wait(&rw->writer_signal,waitval);
2459    lock_futex(&rw->spin);
2460    rw->blocked_writers--;
2461  }
2462  rw->state = 1;
2463  rw->writer = tcr;
2464  unlock_futex(&rw->spin);
2465  return err;
2466}
2467#endif
2468
2469/*
2470  Sort of the same as above, only return EBUSY if we'd have to wait.
2471*/
2472#ifndef USE_FUTEX
2473int
2474rwlock_try_wlock(rwlock *rw, TCR *tcr)
2475{
2476  int ret = EBUSY;
2477
2478  LOCK_SPINLOCK(rw->spin,tcr);
2479  if (rw->writer == tcr) {
2480    rw->state++;
2481    ret = 0;
2482  } else {
2483    if (rw->state == 0) {
2484      rw->writer = tcr;
2485      rw->state = 1;
2486      ret = 0;
2487    }
2488  }
2489  RELEASE_SPINLOCK(rw->spin);
2490  return ret;
2491}
2492#else
2493int
2494rwlock_try_wlock(rwlock *rw, TCR *tcr)
2495{
2496  int ret = EBUSY;
2497
2498  lock_futex(&rw->spin);
2499  if (rw->writer == tcr) {
2500    rw->state++;
2501    ret = 0;
2502  } else {
2503    if (rw->state == 0) {
2504      rw->writer = tcr;
2505      rw->state = 1;
2506      ret = 0;
2507    }
2508  }
2509  unlock_futex(&rw->spin);
2510  return ret;
2511}
2512#endif
2513
2514#ifndef USE_FUTEX
2515int
2516rwlock_try_rlock(rwlock *rw, TCR *tcr)
2517{
2518  int ret = EBUSY;
2519
2520  LOCK_SPINLOCK(rw->spin,tcr);
2521  if (rw->state <= 0) {
2522    --rw->state;
2523    ret = 0;
2524  }
2525  RELEASE_SPINLOCK(rw->spin);
2526  return ret;
2527}
2528#else
2529int
2530rwlock_try_rlock(rwlock *rw, TCR *tcr)
2531{
2532  int ret = EBUSY;
2533
2534  lock_futex(&rw->spin);
2535  if (rw->state <= 0) {
2536    --rw->state;
2537    ret = 0;
2538  }
2539  unlock_futex(&rw->spin);
2540  return ret;
2541}
2542#endif
2543
2544
2545
2546#ifndef USE_FUTEX
2547int
2548rwlock_unlock(rwlock *rw, TCR *tcr)
2549{
2550
2551  int err = 0;
2552  natural blocked_readers = 0;
2553
2554  LOCK_SPINLOCK(rw->spin,tcr);
2555  if (rw->state > 0) {
2556    if (rw->writer != tcr) {
2557      err = EINVAL;
2558    } else {
2559      --rw->state;
2560      if (rw->state == 0) {
2561        rw->writer = NULL;
2562      }
2563    }
2564  } else {
2565    if (rw->state < 0) {
2566      ++rw->state;
2567    } else {
2568      err = EINVAL;
2569    }
2570  }
2571  if (err) {
2572    RELEASE_SPINLOCK(rw->spin);
2573    return err;
2574  }
2575 
2576  if (rw->state == 0) {
2577    if (rw->blocked_writers) {
2578      SEM_RAISE(rw->writer_signal);
2579    } else {
2580      blocked_readers = rw->blocked_readers;
2581      if (blocked_readers) {
2582        SEM_BROADCAST(rw->reader_signal, blocked_readers);
2583      }
2584    }
2585  }
2586  RELEASE_SPINLOCK(rw->spin);
2587  return 0;
2588}
2589#else
2590int
2591rwlock_unlock(rwlock *rw, TCR *tcr)
2592{
2593
2594  int err = 0;
2595
2596  lock_futex(&rw->spin);
2597  if (rw->state > 0) {
2598    if (rw->writer != tcr) {
2599      err = EINVAL;
2600    } else {
2601      --rw->state;
2602      if (rw->state == 0) {
2603        rw->writer = NULL;
2604      }
2605    }
2606  } else {
2607    if (rw->state < 0) {
2608      ++rw->state;
2609    } else {
2610      err = EINVAL;
2611    }
2612  }
2613  if (err) {
2614    unlock_futex(&rw->spin);
2615    return err;
2616  }
2617 
2618  if (rw->state == 0) {
2619    if (rw->blocked_writers) {
2620      ++rw->writer_signal;
2621      unlock_futex(&rw->spin);
2622      futex_wake(&rw->writer_signal,1);
2623      return 0;
2624    }
2625    if (rw->blocked_readers) {
2626      ++rw->reader_signal;
2627      unlock_futex(&rw->spin);
2628      futex_wake(&rw->reader_signal, INT_MAX);
2629      return 0;
2630    }
2631  }
2632  unlock_futex(&rw->spin);
2633  return 0;
2634}
2635#endif
2636
2637       
2638void
2639rwlock_destroy(rwlock *rw)
2640{
2641#ifndef USE_FUTEX
2642  destroy_semaphore((void **)&rw->reader_signal);
2643  destroy_semaphore((void **)&rw->writer_signal);
2644#endif
2645  postGCfree((void *)(rw->malloced_ptr));
2646}
2647
2648
2649
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