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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [boehm-gc/] [win32_threads.c] - Blame information for rev 753

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Line No. Rev Author Line
1 721 jeremybenn
#include "private/gc_priv.h"
2
 
3
#if defined(GC_WIN32_THREADS) 
4
 
5
#include <windows.h>
6
 
7
#ifdef CYGWIN32
8
# include <errno.h>
9
 
10
 /* Cygwin-specific forward decls */
11
# undef pthread_create 
12
# undef pthread_sigmask 
13
# undef pthread_join 
14
# undef pthread_detach
15
# undef dlopen 
16
 
17
# define DEBUG_CYGWIN_THREADS 0
18
 
19
  void * GC_start_routine(void * arg);
20
  void GC_thread_exit_proc(void *arg);
21
 
22
#endif
23
 
24
/* The type of the first argument to InterlockedExchange.       */
25
/* Documented to be LONG volatile *, but at least gcc likes     */
26
/* this better.                                                 */
27
typedef LONG * IE_t;
28
 
29
#ifndef MAX_THREADS
30
# define MAX_THREADS 256
31
    /* FIXME:                                                   */
32
    /* Things may get quite slow for large numbers of threads,  */
33
    /* since we look them up with sequential search.            */
34
#endif
35
 
36
GC_bool GC_thr_initialized = FALSE;
37
 
38
DWORD GC_main_thread = 0;
39
 
40
struct GC_thread_Rep {
41
  LONG in_use; /* Updated without lock. */
42
                        /* We assert that unused        */
43
                        /* entries have invalid ids of  */
44
                        /* zero and zero stack fields.  */
45
  DWORD id;
46
  HANDLE handle;
47
  ptr_t stack_base;     /* The cold end of the stack.   */
48
                        /* 0 ==> entry not valid.       */
49
                        /* !in_use ==> stack_base == 0  */
50
  GC_bool suspended;
51
 
52
# ifdef CYGWIN32
53
    void *status; /* hold exit value until join in case it's a pointer */
54
    pthread_t pthread_id;
55
    short flags;                /* Protected by GC lock.        */
56
#       define FINISHED 1       /* Thread has exited.   */
57
#       define DETACHED 2       /* Thread is intended to be detached.   */
58
# endif
59
};
60
 
61
typedef volatile struct GC_thread_Rep * GC_thread;
62
 
63
/*
64
 * We generally assume that volatile ==> memory ordering, at least among
65
 * volatiles.
66
 */
67
 
68
volatile GC_bool GC_please_stop = FALSE;
69
 
70
volatile struct GC_thread_Rep thread_table[MAX_THREADS];
71
 
72
volatile LONG GC_max_thread_index = 0; /* Largest index in thread_table  */
73
                                       /* that was ever used.           */
74
 
75
extern LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info);
76
 
77
/*
78
 * This may be called from DllMain, and hence operates under unusual
79
 * constraints.
80
 */
81
static GC_thread GC_new_thread(void) {
82
  int i;
83
  /* It appears to be unsafe to acquire a lock here, since this */
84
  /* code is apparently not preeemptible on some systems.       */
85
  /* (This is based on complaints, not on Microsoft's official  */
86
  /* documentation, which says this should perform "only simple */
87
  /* initialization tasks".)                                    */
88
  /* Hence we make do with nonblocking synchronization.         */
89
 
90
  /* The following should be a noop according to the win32      */
91
  /* documentation.  There is empirical evidence that it        */
92
  /* isn't.             - HB                                    */
93
# if defined(MPROTECT_VDB)
94
   if (GC_incremental) SetUnhandledExceptionFilter(GC_write_fault_handler);
95
# endif
96
                /* cast away volatile qualifier */
97
  for (i = 0; InterlockedExchange((IE_t)&thread_table[i].in_use,1) != 0; i++) {
98
    /* Compare-and-swap would make this cleaner, but that's not         */
99
    /* supported before Windows 98 and NT 4.0.  In Windows 2000,        */
100
    /* InterlockedExchange is supposed to be replaced by                */
101
    /* InterlockedExchangePointer, but that's not really what I         */
102
    /* want here.                                                       */
103
    if (i == MAX_THREADS - 1)
104
      ABORT("too many threads");
105
  }
106
  /* Update GC_max_thread_index if necessary.  The following is safe,   */
107
  /* and unlike CompareExchange-based solutions seems to work on all    */
108
  /* Windows95 and later platforms.                                     */
109
  /* Unfortunately, GC_max_thread_index may be temporarily out of       */
110
  /* bounds, so readers have to compensate.                             */
111
  while (i > GC_max_thread_index) {
112
    InterlockedIncrement((IE_t)&GC_max_thread_index);
113
  }
114
  if (GC_max_thread_index >= MAX_THREADS) {
115
    /* We overshot due to simultaneous increments.      */
116
    /* Setting it to MAX_THREADS-1 is always safe.      */
117
    GC_max_thread_index = MAX_THREADS - 1;
118
  }
119
 
120
# ifdef CYGWIN32
121
    thread_table[i].pthread_id = pthread_self();
122
# endif
123
  if (!DuplicateHandle(GetCurrentProcess(),
124
                       GetCurrentThread(),
125
                       GetCurrentProcess(),
126
                       (HANDLE*)&thread_table[i].handle,
127
                       0,
128
                       0,
129
                       DUPLICATE_SAME_ACCESS)) {
130
        DWORD last_error = GetLastError();
131
        GC_printf1("Last error code: %lx\n", last_error);
132
        ABORT("DuplicateHandle failed");
133
  }
134
  thread_table[i].stack_base = GC_get_stack_base();
135
  /* Up until this point, GC_push_all_stacks considers this thread      */
136
  /* invalid.                                                           */
137
  if (thread_table[i].stack_base == NULL)
138
    ABORT("Failed to find stack base in GC_new_thread");
139
  /* Up until this point, this entry is viewed as reserved but invalid  */
140
  /* by GC_delete_thread.                                               */
141
  thread_table[i].id = GetCurrentThreadId();
142
  /* If this thread is being created while we are trying to stop        */
143
  /* the world, wait here.  Hopefully this can't happen on any  */
144
  /* systems that don't allow us to block here.                 */
145
  while (GC_please_stop) Sleep(20);
146
  return thread_table + i;
147
}
148
 
149
/*
150
 * GC_max_thread_index may temporarily be larger than MAX_THREADS.
151
 * To avoid subscript errors, we check on access.
152
 */
153
#ifdef __GNUC__
154
__inline__
155
#endif
156
LONG GC_get_max_thread_index()
157
{
158
  LONG my_max = GC_max_thread_index;
159
 
160
  if (my_max >= MAX_THREADS) return MAX_THREADS-1;
161
  return my_max;
162
}
163
 
164
/* This is intended to be lock-free, though that                        */
165
/* assumes that the CloseHandle becomes visible before the              */
166
/* in_use assignment.                                                   */
167
static void GC_delete_gc_thread(GC_thread thr)
168
{
169
    CloseHandle(thr->handle);
170
      /* cast away volatile qualifier */
171
    thr->stack_base = 0;
172
    thr->id = 0;
173
#   ifdef CYGWIN32
174
      thr->pthread_id = 0;
175
#   endif /* CYGWIN32 */
176
    thr->in_use = FALSE;
177
}
178
 
179
static void GC_delete_thread(DWORD thread_id) {
180
  int i;
181
  LONG my_max = GC_get_max_thread_index();
182
 
183
  for (i = 0;
184
       i <= my_max &&
185
       (!thread_table[i].in_use || thread_table[i].id != thread_id);
186
       /* Must still be in_use, since nobody else can store our thread_id. */
187
       i++) {}
188
  if (i > my_max) {
189
    WARN("Removing nonexistent thread %ld\n", (GC_word)thread_id);
190
  } else {
191
    GC_delete_gc_thread(thread_table+i);
192
  }
193
}
194
 
195
 
196
#ifdef CYGWIN32
197
 
198
/* Return a GC_thread corresponding to a given pthread_t.       */
199
/* Returns 0 if it's not there.                                 */
200
/* We assume that this is only called for pthread ids that      */
201
/* have not yet terminated or are still joinable.               */
202
static GC_thread GC_lookup_thread(pthread_t id)
203
{
204
  int i;
205
  LONG my_max = GC_get_max_thread_index();
206
 
207
  for (i = 0;
208
       i <= my_max &&
209
       (!thread_table[i].in_use || thread_table[i].pthread_id != id
210
        || !thread_table[i].in_use);
211
       /* Must still be in_use, since nobody else can store our thread_id. */
212
       i++);
213
  if (i > my_max) return 0;
214
  return thread_table + i;
215
}
216
 
217
#endif /* CYGWIN32 */
218
 
219
void GC_push_thread_structures GC_PROTO((void))
220
{
221
    /* Unlike the other threads implementations, the thread table here  */
222
    /* contains no pointers to the collectable heap.  Thus we have      */
223
    /* no private structures we need to preserve.                       */
224
# ifdef CYGWIN32
225
  { int i; /* pthreads may keep a pointer in the thread exit value */
226
    LONG my_max = GC_get_max_thread_index();
227
 
228
    for (i = 0; i <= my_max; i++)
229
      if (thread_table[i].in_use)
230
        GC_push_all((ptr_t)&(thread_table[i].status),
231
                    (ptr_t)(&(thread_table[i].status)+1));
232
  }
233
# endif
234
}
235
 
236
/* Defined in misc.c */
237
extern CRITICAL_SECTION GC_write_cs;
238
 
239
void GC_stop_world()
240
{
241
  DWORD thread_id = GetCurrentThreadId();
242
  int i;
243
 
244
  if (!GC_thr_initialized) ABORT("GC_stop_world() called before GC_thr_init()");
245
 
246
  GC_please_stop = TRUE;
247
# ifndef CYGWIN32
248
    EnterCriticalSection(&GC_write_cs);
249
# endif /* !CYGWIN32 */
250
  for (i = 0; i <= GC_get_max_thread_index(); i++)
251
    if (thread_table[i].stack_base != 0
252
        && thread_table[i].id != thread_id) {
253
#     ifdef MSWINCE
254
        /* SuspendThread will fail if thread is running kernel code */
255
        while (SuspendThread(thread_table[i].handle) == (DWORD)-1)
256
          Sleep(10);
257
#     else
258
        /* Apparently the Windows 95 GetOpenFileName call creates       */
259
        /* a thread that does not properly get cleaned up, and          */
260
        /* SuspendThread on its descriptor may provoke a crash.         */
261
        /* This reduces the probability of that event, though it still  */
262
        /* appears there's a race here.                                 */
263
        DWORD exitCode;
264
        if (GetExitCodeThread(thread_table[i].handle,&exitCode) &&
265
            exitCode != STILL_ACTIVE) {
266
          thread_table[i].stack_base = 0; /* prevent stack from being pushed */
267
#         ifndef CYGWIN32
268
            /* this breaks pthread_join on Cygwin, which is guaranteed to  */
269
            /* only see user pthreads                                      */
270
            thread_table[i].in_use = FALSE;
271
            CloseHandle(thread_table[i].handle);
272
#         endif
273
          continue;
274
        }
275
        if (SuspendThread(thread_table[i].handle) == (DWORD)-1)
276
          ABORT("SuspendThread failed");
277
#     endif
278
      thread_table[i].suspended = TRUE;
279
    }
280
# ifndef CYGWIN32
281
    LeaveCriticalSection(&GC_write_cs);
282
# endif /* !CYGWIN32 */
283
}
284
 
285
void GC_start_world()
286
{
287
  DWORD thread_id = GetCurrentThreadId();
288
  int i;
289
  LONG my_max = GC_get_max_thread_index();
290
 
291
  for (i = 0; i <= my_max; i++)
292
    if (thread_table[i].stack_base != 0 && thread_table[i].suspended
293
        && thread_table[i].id != thread_id) {
294
      if (ResumeThread(thread_table[i].handle) == (DWORD)-1)
295
        ABORT("ResumeThread failed");
296
      thread_table[i].suspended = FALSE;
297
    }
298
  GC_please_stop = FALSE;
299
}
300
 
301
# ifdef _MSC_VER
302
#   pragma warning(disable:4715)
303
# endif
304
ptr_t GC_current_stackbottom()
305
{
306
  DWORD thread_id = GetCurrentThreadId();
307
  int i;
308
  LONG my_max = GC_get_max_thread_index();
309
 
310
  for (i = 0; i <= my_max; i++)
311
    if (thread_table[i].stack_base && thread_table[i].id == thread_id)
312
      return thread_table[i].stack_base;
313
  ABORT("no thread table entry for current thread");
314
}
315
# ifdef _MSC_VER
316
#   pragma warning(default:4715)
317
# endif
318
 
319
# ifdef MSWINCE
320
    /* The VirtualQuery calls below won't work properly on WinCE, but   */
321
    /* since each stack is restricted to an aligned 64K region of       */
322
    /* virtual memory we can just take the next lowest multiple of 64K. */
323
#   define GC_get_stack_min(s) \
324
        ((ptr_t)(((DWORD)(s) - 1) & 0xFFFF0000))
325
# else
326
    static ptr_t GC_get_stack_min(ptr_t s)
327
    {
328
        ptr_t bottom;
329
        MEMORY_BASIC_INFORMATION info;
330
        VirtualQuery(s, &info, sizeof(info));
331
        do {
332
            bottom = info.BaseAddress;
333
            VirtualQuery(bottom - 1, &info, sizeof(info));
334
        } while ((info.Protect & PAGE_READWRITE)
335
                 && !(info.Protect & PAGE_GUARD));
336
        return(bottom);
337
    }
338
# endif
339
 
340
void GC_push_all_stacks()
341
{
342
  DWORD thread_id = GetCurrentThreadId();
343
  GC_bool found_me = FALSE;
344
  int i;
345
  int dummy;
346
  ptr_t sp, stack_min;
347
  GC_thread thread;
348
  LONG my_max = GC_get_max_thread_index();
349
 
350
  for (i = 0; i <= my_max; i++) {
351
    thread = thread_table + i;
352
    if (thread -> in_use && thread -> stack_base) {
353
      if (thread -> id == thread_id) {
354
        sp = (ptr_t) &dummy;
355
        found_me = TRUE;
356
      } else {
357
        CONTEXT context;
358
        context.ContextFlags = CONTEXT_INTEGER|CONTEXT_CONTROL;
359
        if (!GetThreadContext(thread_table[i].handle, &context))
360
          ABORT("GetThreadContext failed");
361
 
362
        /* Push all registers that might point into the heap.  Frame    */
363
        /* pointer registers are included in case client code was       */
364
        /* compiled with the 'omit frame pointer' optimisation.         */
365
#       define PUSH1(reg) GC_push_one((word)context.reg)
366
#       define PUSH2(r1,r2) PUSH1(r1), PUSH1(r2)
367
#       define PUSH4(r1,r2,r3,r4) PUSH2(r1,r2), PUSH2(r3,r4)
368
#       if defined(I386)
369
          PUSH4(Edi,Esi,Ebx,Edx), PUSH2(Ecx,Eax), PUSH1(Ebp);
370
          sp = (ptr_t)context.Esp;
371
#       elif defined(ARM32)
372
          PUSH4(R0,R1,R2,R3),PUSH4(R4,R5,R6,R7),PUSH4(R8,R9,R10,R11),PUSH1(R12);
373
          sp = (ptr_t)context.Sp;
374
#       elif defined(SHx)
375
          PUSH4(R0,R1,R2,R3), PUSH4(R4,R5,R6,R7), PUSH4(R8,R9,R10,R11);
376
          PUSH2(R12,R13), PUSH1(R14);
377
          sp = (ptr_t)context.R15;
378
#       elif defined(MIPS)
379
          PUSH4(IntAt,IntV0,IntV1,IntA0), PUSH4(IntA1,IntA2,IntA3,IntT0);
380
          PUSH4(IntT1,IntT2,IntT3,IntT4), PUSH4(IntT5,IntT6,IntT7,IntS0);
381
          PUSH4(IntS1,IntS2,IntS3,IntS4), PUSH4(IntS5,IntS6,IntS7,IntT8);
382
          PUSH4(IntT9,IntK0,IntK1,IntS8);
383
          sp = (ptr_t)context.IntSp;
384
#       elif defined(PPC)
385
          PUSH4(Gpr0, Gpr3, Gpr4, Gpr5),  PUSH4(Gpr6, Gpr7, Gpr8, Gpr9);
386
          PUSH4(Gpr10,Gpr11,Gpr12,Gpr14), PUSH4(Gpr15,Gpr16,Gpr17,Gpr18);
387
          PUSH4(Gpr19,Gpr20,Gpr21,Gpr22), PUSH4(Gpr23,Gpr24,Gpr25,Gpr26);
388
          PUSH4(Gpr27,Gpr28,Gpr29,Gpr30), PUSH1(Gpr31);
389
          sp = (ptr_t)context.Gpr1;
390
#       elif defined(ALPHA)
391
          PUSH4(IntV0,IntT0,IntT1,IntT2), PUSH4(IntT3,IntT4,IntT5,IntT6);
392
          PUSH4(IntT7,IntS0,IntS1,IntS2), PUSH4(IntS3,IntS4,IntS5,IntFp);
393
          PUSH4(IntA0,IntA1,IntA2,IntA3), PUSH4(IntA4,IntA5,IntT8,IntT9);
394
          PUSH4(IntT10,IntT11,IntT12,IntAt);
395
          sp = (ptr_t)context.IntSp;
396
#       else
397
#         error "architecture is not supported"
398
#       endif
399
      }
400
 
401
      stack_min = GC_get_stack_min(thread->stack_base);
402
 
403
      if (sp >= stack_min && sp < thread->stack_base)
404
        GC_push_all_stack(sp, thread->stack_base);
405
      else {
406
        WARN("Thread stack pointer 0x%lx out of range, pushing everything\n",
407
             (unsigned long)sp);
408
        GC_push_all_stack(stack_min, thread->stack_base);
409
      }
410
    }
411
  }
412
  if (!found_me) ABORT("Collecting from unknown thread.");
413
}
414
 
415
void GC_get_next_stack(char *start, char **lo, char **hi)
416
{
417
    int i;
418
#   define ADDR_LIMIT (char *)(-1L)
419
    char * current_min = ADDR_LIMIT;
420
    LONG my_max = GC_get_max_thread_index();
421
 
422
    for (i = 0; i <= my_max; i++) {
423
        char * s = (char *)thread_table[i].stack_base;
424
 
425
        if (0 != s && s > start && s < current_min) {
426
            current_min = s;
427
        }
428
    }
429
    *hi = current_min;
430
    if (current_min == ADDR_LIMIT) {
431
        *lo = ADDR_LIMIT;
432
        return;
433
    }
434
    *lo = GC_get_stack_min(current_min);
435
    if (*lo < start) *lo = start;
436
}
437
 
438
#if !defined(CYGWIN32)
439
 
440
#if !defined(MSWINCE) && defined(GC_DLL)
441
 
442
/* We register threads from DllMain */
443
 
444
GC_API HANDLE WINAPI GC_CreateThread(
445
    LPSECURITY_ATTRIBUTES lpThreadAttributes,
446
    DWORD dwStackSize, LPTHREAD_START_ROUTINE lpStartAddress,
447
    LPVOID lpParameter, DWORD dwCreationFlags, LPDWORD lpThreadId )
448
{
449
    return CreateThread(lpThreadAttributes, dwStackSize, lpStartAddress,
450
                        lpParameter, dwCreationFlags, lpThreadId);
451
}
452
 
453
#else /* defined(MSWINCE) || !defined(GC_DLL))  */
454
 
455
/* We have no DllMain to take care of new threads.  Thus we     */
456
/* must properly intercept thread creation.                     */
457
 
458
typedef struct {
459
    LPTHREAD_START_ROUTINE start;
460
    LPVOID param;
461
} thread_args;
462
 
463
static DWORD WINAPI thread_start(LPVOID arg);
464
 
465
GC_API HANDLE WINAPI GC_CreateThread(
466
    LPSECURITY_ATTRIBUTES lpThreadAttributes,
467
    DWORD dwStackSize, LPTHREAD_START_ROUTINE lpStartAddress,
468
    LPVOID lpParameter, DWORD dwCreationFlags, LPDWORD lpThreadId )
469
{
470
    HANDLE thread_h = NULL;
471
 
472
    thread_args *args;
473
 
474
    if (!GC_is_initialized) GC_init();
475
                /* make sure GC is initialized (i.e. main thread is attached) */
476
 
477
    args = GC_malloc_uncollectable(sizeof(thread_args));
478
        /* Handed off to and deallocated by child thread.       */
479
    if (0 == args) {
480
        SetLastError(ERROR_NOT_ENOUGH_MEMORY);
481
        return NULL;
482
    }
483
 
484
    /* set up thread arguments */
485
        args -> start = lpStartAddress;
486
        args -> param = lpParameter;
487
 
488
    thread_h = CreateThread(lpThreadAttributes,
489
                            dwStackSize, thread_start,
490
                            args, dwCreationFlags,
491
                            lpThreadId);
492
 
493
    return thread_h;
494
}
495
 
496
static DWORD WINAPI thread_start(LPVOID arg)
497
{
498
    DWORD ret = 0;
499
    thread_args *args = (thread_args *)arg;
500
 
501
    GC_new_thread();
502
 
503
    /* Clear the thread entry even if we exit with an exception.        */
504
    /* This is probably pointless, since an uncaught exception is       */
505
    /* supposed to result in the process being killed.                  */
506
#ifndef __GNUC__
507
    __try {
508
#endif /* __GNUC__ */
509
        ret = args->start (args->param);
510
#ifndef __GNUC__
511
    } __finally {
512
#endif /* __GNUC__ */
513
        GC_free(args);
514
        GC_delete_thread(GetCurrentThreadId());
515
#ifndef __GNUC__
516
    }
517
#endif /* __GNUC__ */
518
 
519
    return ret;
520
}
521
#endif /* !defined(MSWINCE) && !(defined(__MINGW32__) && !defined(_DLL))  */
522
 
523
#endif /* !CYGWIN32 */
524
 
525
#ifdef MSWINCE
526
 
527
typedef struct {
528
    HINSTANCE hInstance;
529
    HINSTANCE hPrevInstance;
530
    LPWSTR lpCmdLine;
531
    int nShowCmd;
532
} main_thread_args;
533
 
534
DWORD WINAPI main_thread_start(LPVOID arg);
535
 
536
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
537
                   LPWSTR lpCmdLine, int nShowCmd)
538
{
539
    DWORD exit_code = 1;
540
 
541
    main_thread_args args = {
542
        hInstance, hPrevInstance, lpCmdLine, nShowCmd
543
    };
544
    HANDLE thread_h;
545
    DWORD thread_id;
546
 
547
    /* initialize everything */
548
    GC_init();
549
 
550
    /* start the main thread */
551
    thread_h = GC_CreateThread(
552
        NULL, 0, main_thread_start, &args, 0, &thread_id);
553
 
554
    if (thread_h != NULL)
555
    {
556
        WaitForSingleObject (thread_h, INFINITE);
557
        GetExitCodeThread (thread_h, &exit_code);
558
        CloseHandle (thread_h);
559
    }
560
 
561
    GC_deinit();
562
    DeleteCriticalSection(&GC_allocate_ml);
563
 
564
    return (int) exit_code;
565
}
566
 
567
DWORD WINAPI main_thread_start(LPVOID arg)
568
{
569
    main_thread_args * args = (main_thread_args *) arg;
570
 
571
    return (DWORD) GC_WinMain (args->hInstance, args->hPrevInstance,
572
                               args->lpCmdLine, args->nShowCmd);
573
}
574
 
575
# else /* !MSWINCE */
576
 
577
/* Called by GC_init() - we hold the allocation lock.   */
578
void GC_thr_init() {
579
    if (GC_thr_initialized) return;
580
    GC_main_thread = GetCurrentThreadId();
581
    GC_thr_initialized = TRUE;
582
 
583
    /* Add the initial thread, so we can stop it.       */
584
    GC_new_thread();
585
}
586
 
587
#ifdef CYGWIN32
588
 
589
struct start_info {
590
    void *(*start_routine)(void *);
591
    void *arg;
592
    GC_bool detached;
593
};
594
 
595
int GC_pthread_join(pthread_t pthread_id, void **retval) {
596
    int result;
597
    int i;
598
    GC_thread me;
599
 
600
#   if DEBUG_CYGWIN_THREADS
601
      GC_printf3("thread 0x%x(0x%x) is joining thread 0x%x.\n",
602
                 (int)pthread_self(), GetCurrentThreadId(), (int)pthread_id);
603
#   endif
604
 
605
    /* Thread being joined might not have registered itself yet. */
606
    /* After the join,thread id may have been recycled.          */
607
    /* FIXME: It would be better if this worked more like        */
608
    /* pthread_support.c.                                        */
609
 
610
    while ((me = GC_lookup_thread(pthread_id)) == 0) Sleep(10);
611
 
612
    result = pthread_join(pthread_id, retval);
613
 
614
    GC_delete_gc_thread(me);
615
 
616
#   if DEBUG_CYGWIN_THREADS
617
      GC_printf3("thread 0x%x(0x%x) completed join with thread 0x%x.\n",
618
                 (int)pthread_self(), GetCurrentThreadId(), (int)pthread_id);
619
#   endif
620
 
621
    return result;
622
}
623
 
624
/* Cygwin-pthreads calls CreateThread internally, but it's not
625
 * easily interceptible by us..
626
 *   so intercept pthread_create instead
627
 */
628
int
629
GC_pthread_create(pthread_t *new_thread,
630
                  const pthread_attr_t *attr,
631
                  void *(*start_routine)(void *), void *arg) {
632
    int result;
633
    struct start_info * si;
634
 
635
    if (!GC_is_initialized) GC_init();
636
                /* make sure GC is initialized (i.e. main thread is attached) */
637
 
638
    /* This is otherwise saved only in an area mmapped by the thread */
639
    /* library, which isn't visible to the collector.            */
640
    si = GC_malloc_uncollectable(sizeof(struct start_info));
641
    if (0 == si) return(EAGAIN);
642
 
643
    si -> start_routine = start_routine;
644
    si -> arg = arg;
645
    if (attr != 0 &&
646
        pthread_attr_getdetachstate(attr, &si->detached)
647
        == PTHREAD_CREATE_DETACHED) {
648
      si->detached = TRUE;
649
    }
650
 
651
#   if DEBUG_CYGWIN_THREADS
652
      GC_printf2("About to create a thread from 0x%x(0x%x)\n",
653
                 (int)pthread_self(), GetCurrentThreadId);
654
#   endif
655
    result = pthread_create(new_thread, attr, GC_start_routine, si);
656
 
657
    if (result) { /* failure */
658
        GC_free(si);
659
    }
660
 
661
    return(result);
662
}
663
 
664
void * GC_start_routine(void * arg)
665
{
666
    struct start_info * si = arg;
667
    void * result;
668
    void *(*start)(void *);
669
    void *start_arg;
670
    pthread_t pthread_id;
671
    GC_thread me;
672
    GC_bool detached;
673
    int i;
674
 
675
#   if DEBUG_CYGWIN_THREADS
676
      GC_printf2("thread 0x%x(0x%x) starting...\n",(int)pthread_self(),
677
                                                   GetCurrentThreadId());
678
#   endif
679
 
680
    /* If a GC occurs before the thread is registered, that GC will     */
681
    /* ignore this thread.  That's fine, since it will block trying to  */
682
    /* acquire the allocation lock, and won't yet hold interesting      */
683
    /* pointers.                                                        */
684
    LOCK();
685
    /* We register the thread here instead of in the parent, so that    */
686
    /* we don't need to hold the allocation lock during pthread_create. */
687
    me = GC_new_thread();
688
    UNLOCK();
689
 
690
    start = si -> start_routine;
691
    start_arg = si -> arg;
692
    if (si-> detached) me -> flags |= DETACHED;
693
    me -> pthread_id = pthread_id = pthread_self();
694
 
695
    GC_free(si); /* was allocated uncollectable */
696
 
697
    pthread_cleanup_push(GC_thread_exit_proc, (void *)me);
698
    result = (*start)(start_arg);
699
    me -> status = result;
700
    pthread_cleanup_pop(0);
701
 
702
#   if DEBUG_CYGWIN_THREADS
703
      GC_printf2("thread 0x%x(0x%x) returned from start routine.\n",
704
                 (int)pthread_self(),GetCurrentThreadId());
705
#   endif
706
 
707
    return(result);
708
}
709
 
710
void GC_thread_exit_proc(void *arg)
711
{
712
    GC_thread me = (GC_thread)arg;
713
    int i;
714
 
715
#   if DEBUG_CYGWIN_THREADS
716
      GC_printf2("thread 0x%x(0x%x) called pthread_exit().\n",
717
                 (int)pthread_self(),GetCurrentThreadId());
718
#   endif
719
 
720
    LOCK();
721
    if (me -> flags & DETACHED) {
722
      GC_delete_thread(GetCurrentThreadId());
723
    } else {
724
      /* deallocate it as part of join */
725
      me -> flags |= FINISHED;
726
    }
727
    UNLOCK();
728
}
729
 
730
/* nothing required here... */
731
int GC_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset) {
732
  return pthread_sigmask(how, set, oset);
733
}
734
 
735
int GC_pthread_detach(pthread_t thread)
736
{
737
    int result;
738
    GC_thread thread_gc_id;
739
 
740
    LOCK();
741
    thread_gc_id = GC_lookup_thread(thread);
742
    UNLOCK();
743
    result = pthread_detach(thread);
744
    if (result == 0) {
745
      LOCK();
746
      thread_gc_id -> flags |= DETACHED;
747
      /* Here the pthread thread id may have been recycled. */
748
      if (thread_gc_id -> flags & FINISHED) {
749
        GC_delete_gc_thread(thread_gc_id);
750
      }
751
      UNLOCK();
752
    }
753
    return result;
754
}
755
 
756
GC_PTR GC_get_thread_stack_base()
757
{
758
  extern GC_PTR _tlsbase __asm__ ("%fs:4");
759
  return _tlsbase;
760
}
761
 
762
#else /* !CYGWIN32 */
763
 
764
/*
765
 * We avoid acquiring locks here, since this doesn't seem to be preemptable.
766
 * Pontus Rydin suggests wrapping the thread start routine instead.
767
 */
768
#ifdef GC_DLL
769
BOOL WINAPI DllMain(HINSTANCE inst, ULONG reason, LPVOID reserved)
770
{
771
  switch (reason) {
772
  case DLL_PROCESS_ATTACH:
773
    GC_init();  /* Force initialization before thread attach.   */
774
    /* fall through */
775
  case DLL_THREAD_ATTACH:
776
    GC_ASSERT(GC_thr_initialized);
777
    if (GC_main_thread != GetCurrentThreadId()) {
778
        GC_new_thread();
779
    } /* o.w. we already did it during GC_thr_init(), called by GC_init() */
780
    break;
781
 
782
  case DLL_THREAD_DETACH:
783
    GC_delete_thread(GetCurrentThreadId());
784
    break;
785
 
786
  case DLL_PROCESS_DETACH:
787
    {
788
      int i;
789
 
790
      LOCK();
791
      for (i = 0; i <= GC_get_max_thread_index(); ++i)
792
      {
793
          if (thread_table[i].in_use)
794
            GC_delete_gc_thread(thread_table + i);
795
      }
796
      UNLOCK();
797
 
798
      GC_deinit();
799
      DeleteCriticalSection(&GC_allocate_ml);
800
    }
801
    break;
802
 
803
  }
804
  return TRUE;
805
}
806
#endif /* GC_DLL */
807
#endif /* !CYGWIN32 */
808
 
809
# endif /* !MSWINCE */
810
 
811
#endif /* GC_WIN32_THREADS */

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