2 #include "private/gc_priv.h"
4 #if defined(GC_WIN32_THREADS)
8 #ifdef THREAD_LOCAL_ALLOC
9 # include "private/thread_local_alloc.h"
10 #endif /* THREAD_LOCAL_ALLOC */
12 /* Allocation lock declarations. */
13 #if !defined(USE_PTHREAD_LOCKS)
15 __declspec(dllexport) CRITICAL_SECTION GC_allocate_ml;
17 CRITICAL_SECTION GC_allocate_ml;
19 DWORD GC_lock_holder = NO_THREAD;
20 /* Thread id for current holder of allocation lock */
22 pthread_mutex_t GC_allocate_ml = PTHREAD_MUTEX_INITIALIZER;
23 unsigned long GC_lock_holder = NO_THREAD;
29 /* GC_DLL should not normally be defined, especially since we often do turn */
30 /* on THREAD_LOCAL_ALLOC, which is currently incompatible. */
31 /* It might be possible to get GC_DLL and DllMain-based thread registration */
32 /* to work with Cygwin, but if you try you are on your own. */
34 # error GC_DLL untested with Cygwin
37 /* Cygwin-specific forward decls */
38 # undef pthread_create
39 # undef pthread_sigmask
41 # undef pthread_detach
46 # define DEBUG_CYGWIN_THREADS 1
47 # define DEBUG_WIN32_PTHREADS 0
49 # define DEBUG_WIN32_PTHREADS 1
50 # define DEBUG_CYGWIN_THREADS 0
53 # define DEBUG_CYGWIN_THREADS 0
54 # define DEBUG_WIN32_PTHREADS 0
57 void * GC_pthread_start(void * arg);
58 void GC_thread_exit_proc(void *arg);
65 # define DEBUG_WIN32_THREADS 1
67 # define DEBUG_WIN32_THREADS 0
72 # undef _beginthreadex
76 # define DEBUG_WIN32_THREADS 1
78 # define DEBUG_WIN32_THREADS 0
81 # include <process.h> /* For _beginthreadex, _endthreadex */
85 #if defined(GC_DLL) && !defined(MSWINCE)
86 static GC_bool GC_win32_dll_threads = FALSE;
87 /* This code operates in two distinct modes, depending on */
88 /* the setting of GC_win32_dll_threads. If */
89 /* GC_win32_dll_threads is set, all threads in the process */
90 /* are implicitly registered with the GC by DllMain. */
91 /* No explicit registration is required, and attempts at */
92 /* explicit registration are ignored. This mode is */
93 /* very different from the Posix operation of the collector. */
94 /* In this mode access to the thread table is lock-free. */
95 /* Hence there is a static limit on the number of threads. */
97 /* If GC_win32_dll_threads is FALSE, or the collector is */
98 /* built without GC_DLL defined, things operate in a way */
99 /* that is very similar to Posix platforms, and new threads */
100 /* must be registered with the collector, e.g. by using */
101 /* preprocessor-based interception of the thread primitives. */
102 /* In this case, we use a real data structure for the thread */
103 /* table. Note that there is no equivalent of linker-based */
104 /* call interception, since we don't have ELF-like */
105 /* facilities. The Windows analog appears to be "API */
106 /* hooking", which really seems to be a standard way to */
107 /* do minor binary rewriting (?). I'd prefer not to have */
108 /* the basic collector rely on such facilities, but an */
109 /* optional package that intercepts thread calls this way */
110 /* would probably be nice. */
112 /* GC_win32_dll_threads must be set at initialization time, */
113 /* i.e. before any collector or thread calls. We make it a */
114 /* "dynamic" option only to avoid multiple library versions. */
116 # define GC_win32_dll_threads FALSE
119 /* We have two versions of the thread table. Which one */
120 /* we us depends on whether or not GC_win32_dll_threads */
121 /* is set. Note that before initialization, we don't */
122 /* add any entries to either table, even if DllMain is */
123 /* called. The main thread will be added on */
124 /* initialization. */
126 /* The type of the first argument to InterlockedExchange. */
127 /* Documented to be LONG volatile *, but at least gcc likes */
131 GC_bool GC_thr_initialized = FALSE;
133 GC_bool GC_need_to_lock = FALSE;
135 static GC_bool parallel_initialized = FALSE;
137 void GC_init_parallel(void);
140 /* Turn on GC_win32_dll_threads */
141 GC_API void GC_use_DllMain(void)
143 # ifdef THREAD_LOCAL_ALLOC
144 ABORT("Cannot use thread local allocation with DllMain-based "
145 "thread registration.");
146 /* Thread-local allocation really wants to lock at thread */
147 /* entry and exit. */
149 GC_ASSERT(!parallel_initialized);
150 GC_win32_dll_threads = TRUE;
153 GC_API void GC_use_DllMain(void)
155 ABORT("GC not configured as DLL");
159 DWORD GC_main_thread = 0;
161 struct GC_Thread_Rep {
163 AO_t tm_in_use; /* Updated without lock. */
164 /* We assert that unused */
165 /* entries have invalid ids of */
166 /* zero and zero stack fields. */
167 /* Used only with GC_win32_dll_threads. */
168 struct GC_Thread_Rep * tm_next;
169 /* Hash table link without */
170 /* GC_win32_dll_threads. */
171 /* More recently allocated threads */
172 /* with a given pthread id come */
173 /* first. (All but the first are */
174 /* guaranteed to be dead, but we may */
175 /* not yet have registered the join.) */
177 # define in_use table_management.tm_in_use
178 # define next table_management.tm_next
181 ptr_t stack_base; /* The cold end of the stack. */
182 /* 0 ==> entry not valid. */
183 /* !in_use ==> stack_base == 0 */
187 void *status; /* hold exit value until join in case it's a pointer */
188 pthread_t pthread_id;
189 short flags; /* Protected by GC lock. */
190 # define FINISHED 1 /* Thread has exited. */
191 # define DETACHED 2 /* Thread is intended to be detached. */
192 # define KNOWN_FINISHED(t) (((t) -> flags) & FINISHED)
194 # define KNOWN_FINISHED(t) 0
196 # ifdef THREAD_LOCAL_ALLOC
197 struct thread_local_freelists tlfs;
201 typedef struct GC_Thread_Rep * GC_thread;
202 typedef volatile struct GC_Thread_Rep * GC_vthread;
205 * We assumed that volatile ==> memory ordering, at least among
206 * volatiles. This code should consistently use atomic_ops.
209 volatile GC_bool GC_please_stop = FALSE;
212 * We track thread attachments while the world is supposed to be stopped.
213 * Unfortunately, we can't stop them from starting, since blocking in
214 * DllMain seems to cause the world to deadlock. Thus we have to recover
215 * If we notice this in the middle of marking.
218 AO_t GC_attached_thread = FALSE;
219 /* Return TRUE if an thread was attached since we last asked or */
220 /* since GC_attached_thread was explicitly reset. */
221 GC_bool GC_started_thread_while_stopped(void)
225 if (GC_win32_dll_threads) {
226 AO_nop_full(); /* Prior heap reads need to complete earlier. */
227 result = AO_load(&GC_attached_thread);
229 AO_store(&GC_attached_thread, FALSE);
231 return ((GC_bool)result);
237 /* Thread table used if GC_win32_dll_threads is set. */
238 /* This is a fixed size array. */
239 /* Since we use runtime conditionals, both versions */
240 /* are always defined. */
242 # define MAX_THREADS 512
244 /* Things may get quite slow for large numbers of threads, */
245 /* since we look them up with sequential search. */
247 volatile struct GC_Thread_Rep dll_thread_table[MAX_THREADS];
249 volatile LONG GC_max_thread_index = 0;
250 /* Largest index in dll_thread_table */
251 /* that was ever used. */
253 /* And now the version used if GC_win32_dll_threads is not set. */
254 /* This is a chained hash table, with much of the code borrowed */
255 /* From the Posix implementation. */
256 # define THREAD_TABLE_SZ 256 /* Must be power of 2 */
257 GC_thread GC_threads[THREAD_TABLE_SZ];
260 /* Add a thread to GC_threads. We assume it wasn't already there. */
261 /* Caller holds allocation lock. */
262 /* Unlike the pthreads version, the id field is set by the caller. */
263 GC_thread GC_new_thread(DWORD id)
265 word hv = ((word)id) % THREAD_TABLE_SZ;
267 /* It may not be safe to allocate when we register the first thread. */
268 static struct GC_Thread_Rep first_thread;
269 static GC_bool first_thread_used = FALSE;
271 GC_ASSERT(I_HOLD_LOCK());
272 if (!first_thread_used) {
273 result = &first_thread;
274 first_thread_used = TRUE;
276 GC_ASSERT(!GC_win32_dll_threads);
277 result = (struct GC_Thread_Rep *)
278 GC_INTERNAL_MALLOC(sizeof(struct GC_Thread_Rep), NORMAL);
280 /* result can be NULL -> segfault */
281 GC_ASSERT(result -> flags == 0);
284 if (result == 0) return(0);
285 /* result -> id = id; Done by caller. */
286 result -> next = GC_threads[hv];
287 GC_threads[hv] = result;
289 GC_ASSERT(result -> flags == 0 /* && result -> thread_blocked == 0 */);
294 extern LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info);
296 #if defined(GWW_VDB) && defined(MPROTECT_VDB)
297 extern GC_bool GC_gww_dirty_init(void);
298 /* Defined in os_dep.c. Returns TRUE if GetWriteWatch is available. */
299 /* may be called repeatedly. */
302 GC_bool GC_in_thread_creation = FALSE; /* Protected by allocation lock. */
305 * This may be called from DllMain, and hence operates under unusual
306 * constraints. In particular, it must be lock-free if GC_win32_dll_threads
307 * is set. Always called from the thread being added.
308 * If GC_win32_dll_threads is not set, we already hold the allocation lock,
309 * except possibly during single-threaded start-up code.
311 static GC_thread GC_register_my_thread_inner(struct GC_stack_base *sb,
316 /* The following should be a noop according to the win32 */
317 /* documentation. There is empirical evidence that it */
319 # if defined(MPROTECT_VDB)
320 # if defined(GWW_VDB)
321 if (GC_incremental && !GC_gww_dirty_init())
322 SetUnhandledExceptionFilter(GC_write_fault_handler);
324 if (GC_incremental) SetUnhandledExceptionFilter(GC_write_fault_handler);
328 if (GC_win32_dll_threads) {
330 /* It appears to be unsafe to acquire a lock here, since this */
331 /* code is apparently not preeemptible on some systems. */
332 /* (This is based on complaints, not on Microsoft's official */
333 /* documentation, which says this should perform "only simple */
334 /* initialization tasks".) */
335 /* Hence we make do with nonblocking synchronization. */
336 /* It has been claimed that DllMain is really only executed with */
337 /* a particular system lock held, and thus careful use of locking */
338 /* around code that doesn't call back into the system libraries */
339 /* might be OK. But this hasn't been tested across all win32 */
341 /* cast away volatile qualifier */
342 for (i = 0; InterlockedExchange((IE_t)&dll_thread_table[i].in_use,1) != 0;
344 /* Compare-and-swap would make this cleaner, but that's not */
345 /* supported before Windows 98 and NT 4.0. In Windows 2000, */
346 /* InterlockedExchange is supposed to be replaced by */
347 /* InterlockedExchangePointer, but that's not really what I */
349 /* FIXME: We should eventually declare Win95 dead and use AO_ */
350 /* primitives here. */
351 if (i == MAX_THREADS - 1)
352 ABORT("too many threads");
354 /* Update GC_max_thread_index if necessary. The following is safe, */
355 /* and unlike CompareExchange-based solutions seems to work on all */
356 /* Windows95 and later platforms. */
357 /* Unfortunately, GC_max_thread_index may be temporarily out of */
358 /* bounds, so readers have to compensate. */
359 while (i > GC_max_thread_index) {
360 InterlockedIncrement((IE_t)&GC_max_thread_index);
362 if (GC_max_thread_index >= MAX_THREADS) {
363 /* We overshot due to simultaneous increments. */
364 /* Setting it to MAX_THREADS-1 is always safe. */
365 GC_max_thread_index = MAX_THREADS - 1;
367 me = dll_thread_table + i;
368 } else /* Not using DllMain */ {
369 GC_ASSERT(I_HOLD_LOCK());
370 GC_in_thread_creation = TRUE; /* OK to collect from unknown thread. */
371 me = GC_new_thread(thread_id);
372 GC_in_thread_creation = FALSE;
375 /* me can be NULL -> segfault */
376 me -> pthread_id = pthread_self();
379 if (!DuplicateHandle(GetCurrentProcess(),
382 (HANDLE*)&(me -> handle),
385 DUPLICATE_SAME_ACCESS)) {
386 DWORD last_error = GetLastError();
387 GC_err_printf("Last error code: %d\n", last_error);
388 ABORT("DuplicateHandle failed");
390 me -> stack_base = sb -> mem_base;
391 /* Up until this point, GC_push_all_stacks considers this thread */
393 /* Up until this point, this entry is viewed as reserved but invalid */
394 /* by GC_delete_thread. */
395 me -> id = thread_id;
396 # if defined(THREAD_LOCAL_ALLOC)
397 GC_init_thread_local((GC_tlfs)(&(me->tlfs)));
399 if (me -> stack_base == NULL)
400 ABORT("Bad stack base in GC_register_my_thread_inner");
401 if (GC_win32_dll_threads) {
402 if (GC_please_stop) {
403 AO_store(&GC_attached_thread, TRUE);
404 AO_nop_full(); // Later updates must become visible after this.
406 /* We'd like to wait here, but can't, since waiting in DllMain */
407 /* provokes deadlocks. */
408 /* Thus we force marking to be restarted instead. */
410 GC_ASSERT(!GC_please_stop);
411 /* Otherwise both we and the thread stopping code would be */
412 /* holding the allocation lock. */
414 return (GC_thread)(me);
418 * GC_max_thread_index may temporarily be larger than MAX_THREADS.
419 * To avoid subscript errors, we check on access.
424 LONG GC_get_max_thread_index()
426 LONG my_max = GC_max_thread_index;
428 if (my_max >= MAX_THREADS) return MAX_THREADS-1;
432 /* Return the GC_thread corresponding to a thread id. May be called */
433 /* without a lock, but should be called in contexts in which the */
434 /* requested thread cannot be asynchronously deleted, e.g. from the */
436 /* This version assumes that either GC_win32_dll_threads is set, or */
437 /* we hold the allocator lock. */
438 /* Also used (for assertion checking only) from thread_local_alloc.c. */
439 GC_thread GC_lookup_thread_inner(DWORD thread_id) {
440 if (GC_win32_dll_threads) {
442 LONG my_max = GC_get_max_thread_index();
445 (!AO_load_acquire(&(dll_thread_table[i].in_use))
446 || dll_thread_table[i].id != thread_id);
447 /* Must still be in_use, since nobody else can store our thread_id. */
452 return (GC_thread)(dll_thread_table + i);
455 word hv = ((word)thread_id) % THREAD_TABLE_SZ;
456 register GC_thread p = GC_threads[hv];
458 GC_ASSERT(I_HOLD_LOCK());
459 while (p != 0 && p -> id != thread_id) p = p -> next;
464 /* A version of the above that acquires the lock if necessary. Note */
465 /* that the identically named function for pthreads is different, and */
466 /* just assumes we hold the lock. */
467 /* Also used (for assertion checking only) from thread_local_alloc.c. */
468 static GC_thread GC_lookup_thread(DWORD thread_id)
470 if (GC_win32_dll_threads) {
471 return GC_lookup_thread_inner(thread_id);
475 result = GC_lookup_thread_inner(thread_id);
481 /* If a thread has been joined, but we have not yet */
482 /* been notified, then there may be more than one thread */
483 /* in the table with the same win32 id. */
484 /* This is OK, but we need a way to delete a specific one. */
485 /* Assumes we hold the allocation lock unless */
486 /* GC_win32_dll_threads is set. */
487 /* If GC_win32_dll_threads is set it should be called from the */
488 /* thread being deleted. */
489 void GC_delete_gc_thread(GC_vthread gc_id)
491 if (GC_win32_dll_threads) {
492 /* This is intended to be lock-free. */
493 /* It is either called synchronously from the thread being deleted, */
494 /* or by the joining thread. */
495 /* In this branch asynchronosu changes to *gc_id are possible. */
496 CloseHandle(gc_id->handle);
497 gc_id -> stack_base = 0;
500 gc_id -> pthread_id = 0;
501 # endif /* CYGWIN32 */
502 # ifdef GC_WIN32_PTHREADS
503 gc_id -> pthread_id.p = NULL;
504 # endif /* GC_WIN32_PTHREADS */
505 AO_store_release(&(gc_id->in_use), FALSE);
507 /* Cast away volatile qualifier, since we have lock. */
508 GC_thread gc_nvid = (GC_thread)gc_id;
509 DWORD id = gc_nvid -> id;
510 word hv = ((word)id) % THREAD_TABLE_SZ;
511 register GC_thread p = GC_threads[hv];
512 register GC_thread prev = 0;
514 GC_ASSERT(I_HOLD_LOCK());
515 while (p != gc_nvid) {
520 GC_threads[hv] = p -> next;
522 prev -> next = p -> next;
528 /* Delete a thread from GC_threads. We assume it is there. */
529 /* (The code intentionally traps if it wasn't.) */
530 /* Assumes we hold the allocation lock unless */
531 /* GC_win32_dll_threads is set. */
532 /* If GC_win32_dll_threads is set it should be called from the */
533 /* thread being deleted. */
534 void GC_delete_thread(DWORD id)
536 if (GC_win32_dll_threads) {
537 GC_thread t = GC_lookup_thread_inner(id);
540 WARN("Removing nonexistent thread %ld\n", (GC_word)id);
542 GC_delete_gc_thread(t);
545 word hv = ((word)id) % THREAD_TABLE_SZ;
546 register GC_thread p = GC_threads[hv];
547 register GC_thread prev = 0;
549 GC_ASSERT(I_HOLD_LOCK());
550 while (p -> id != id) {
555 GC_threads[hv] = p -> next;
557 prev -> next = p -> next;
563 int GC_register_my_thread(struct GC_stack_base *sb) {
564 DWORD t = GetCurrentThreadId();
566 if (0 == GC_lookup_thread(t)) {
567 /* We lock here, since we want to wait for an ongoing GC. */
569 GC_register_my_thread_inner(sb, t);
577 int GC_unregister_my_thread(void)
579 DWORD t = GetCurrentThreadId();
581 # if defined(THREAD_LOCAL_ALLOC)
584 GC_thread me = GC_lookup_thread_inner(t);
585 GC_destroy_thread_local(&(me->tlfs));
589 if (GC_win32_dll_threads) {
590 /* Should we just ignore this? */
603 /* A quick-and-dirty cache of the mapping between pthread_t */
604 /* and win32 thread id. */
605 #define PTHREAD_MAP_SIZE 512
606 DWORD GC_pthread_map_cache[PTHREAD_MAP_SIZE];
607 #define HASH(pthread_id) ((NUMERIC_THREAD_ID(pthread_id) >> 5) % PTHREAD_MAP_SIZE)
608 /* It appears pthread_t is really a pointer type ... */
609 #define SET_PTHREAD_MAP_CACHE(pthread_id, win32_id) \
610 GC_pthread_map_cache[HASH(pthread_id)] = (win32_id);
611 #define GET_PTHREAD_MAP_CACHE(pthread_id) \
612 GC_pthread_map_cache[HASH(pthread_id)]
614 /* Return a GC_thread corresponding to a given pthread_t. */
615 /* Returns 0 if it's not there. */
616 /* We assume that this is only called for pthread ids that */
617 /* have not yet terminated or are still joinable, and */
618 /* cannot be concurrently terminated. */
619 /* Assumes we do NOT hold the allocation lock. */
620 static GC_thread GC_lookup_pthread(pthread_t id)
622 if (GC_win32_dll_threads) {
624 LONG my_max = GC_get_max_thread_index();
628 (!AO_load_acquire(&(dll_thread_table[i].in_use))
629 || THREAD_EQUAL(dll_thread_table[i].pthread_id, id));
630 /* Must still be in_use, since nobody else can store our thread_id. */
632 if (i > my_max) return 0;
633 return (GC_thread)(dll_thread_table + i);
635 /* We first try the cache. If that fails, we use a very slow */
637 int hv_guess = GET_PTHREAD_MAP_CACHE(id) % THREAD_TABLE_SZ;
642 for (p = GC_threads[hv_guess]; 0 != p; p = p -> next) {
643 if (THREAD_EQUAL(p -> pthread_id, id))
646 for (hv = 0; hv < THREAD_TABLE_SZ; ++hv) {
647 for (p = GC_threads[hv]; 0 != p; p = p -> next) {
648 if (THREAD_EQUAL(p -> pthread_id, id))
659 #endif /* GC_PTHREADS */
661 void GC_push_thread_structures(void)
663 GC_ASSERT(I_HOLD_LOCK());
664 if (GC_win32_dll_threads) {
665 /* Unlike the other threads implementations, the thread table here */
666 /* contains no pointers to the collectable heap. Thus we have */
667 /* no private structures we need to preserve. */
669 { int i; /* pthreads may keep a pointer in the thread exit value */
670 LONG my_max = GC_get_max_thread_index();
672 for (i = 0; i <= my_max; i++)
673 if (dll_thread_table[i].in_use)
674 GC_push_all((ptr_t)&(dll_thread_table[i].status),
675 (ptr_t)(&(dll_thread_table[i].status)+1));
679 GC_push_all((ptr_t)(GC_threads), (ptr_t)(GC_threads)+sizeof(GC_threads));
681 # if defined(THREAD_LOCAL_ALLOC)
682 GC_push_all((ptr_t)(&GC_thread_key),
683 (ptr_t)(&GC_thread_key)+sizeof(&GC_thread_key));
684 /* Just in case we ever use our own TLS implementation. */
688 /* Suspend the given thread, if it's still active. */
689 void GC_suspend(GC_thread t)
692 /* SuspendThread will fail if thread is running kernel code */
693 while (SuspendThread(t -> handle) == (DWORD)-1)
696 /* Apparently the Windows 95 GetOpenFileName call creates */
697 /* a thread that does not properly get cleaned up, and */
698 /* SuspendThread on its descriptor may provoke a crash. */
699 /* This reduces the probability of that event, though it still */
700 /* appears there's a race here. */
702 if (GetExitCodeThread(t -> handle, &exitCode) &&
703 exitCode != STILL_ACTIVE) {
704 t -> stack_base = 0; /* prevent stack from being pushed */
706 /* this breaks pthread_join on Cygwin, which is guaranteed to */
707 /* only see user pthreads */
708 AO_store(&(t -> in_use), FALSE);
709 CloseHandle(t -> handle);
713 if (SuspendThread(t -> handle) == (DWORD)-1)
714 ABORT("SuspendThread failed");
716 t -> suspended = TRUE;
719 /* Defined in misc.c */
721 extern CRITICAL_SECTION GC_write_cs;
724 void GC_stop_world(void)
726 DWORD thread_id = GetCurrentThreadId();
729 if (!GC_thr_initialized) ABORT("GC_stop_world() called before GC_thr_init()");
730 GC_ASSERT(I_HOLD_LOCK());
732 GC_please_stop = TRUE;
734 EnterCriticalSection(&GC_write_cs);
736 if (GC_win32_dll_threads) {
737 /* Any threads being created during this loop will end up setting */
738 /* GC_attached_thread when they start. This will force marking to */
740 /* This is not ideal, but hopefully correct. */
741 GC_attached_thread = FALSE;
742 for (i = 0; i <= GC_get_max_thread_index(); i++) {
743 GC_vthread t = dll_thread_table + i;
744 if (t -> stack_base != 0
745 && t -> id != thread_id) {
746 GC_suspend((GC_thread)t);
753 for (i = 0; i < THREAD_TABLE_SZ; i++) {
754 for (t = GC_threads[i]; t != 0; t = t -> next) {
755 if (t -> stack_base != 0
756 && !KNOWN_FINISHED(t)
757 && t -> id != thread_id) {
764 LeaveCriticalSection(&GC_write_cs);
768 void GC_start_world(void)
770 DWORD thread_id = GetCurrentThreadId();
772 LONG my_max = GC_get_max_thread_index();
774 GC_ASSERT(I_HOLD_LOCK());
775 if (GC_win32_dll_threads) {
776 for (i = 0; i <= my_max; i++) {
777 GC_thread t = (GC_thread)(dll_thread_table + i);
778 if (t -> stack_base != 0 && t -> suspended
779 && t -> id != thread_id) {
780 if (ResumeThread(t -> handle) == (DWORD)-1)
781 ABORT("ResumeThread failed");
782 t -> suspended = FALSE;
789 for (i = 0; i < THREAD_TABLE_SZ; i++) {
790 for (t = GC_threads[i]; t != 0; t = t -> next) {
791 if (t -> stack_base != 0 && t -> suspended
792 && t -> id != thread_id) {
793 if (ResumeThread(t -> handle) == (DWORD)-1)
794 ABORT("ResumeThread failed");
795 t -> suspended = FALSE;
800 GC_please_stop = FALSE;
804 /* The VirtualQuery calls below won't work properly on WinCE, but */
805 /* since each stack is restricted to an aligned 64K region of */
806 /* virtual memory we can just take the next lowest multiple of 64K. */
807 # define GC_get_stack_min(s) \
808 ((ptr_t)(((DWORD)(s) - 1) & 0xFFFF0000))
810 static ptr_t GC_get_stack_min(ptr_t s)
813 MEMORY_BASIC_INFORMATION info;
814 VirtualQuery(s, &info, sizeof(info));
816 bottom = info.BaseAddress;
817 VirtualQuery(bottom - 1, &info, sizeof(info));
818 } while ((info.Protect & PAGE_READWRITE)
819 && !(info.Protect & PAGE_GUARD));
824 void GC_push_stack_for(GC_thread thread)
828 DWORD me = GetCurrentThreadId();
830 if (thread -> stack_base) {
831 if (thread -> id == me) {
835 context.ContextFlags = CONTEXT_INTEGER|CONTEXT_CONTROL;
836 if (!GetThreadContext(thread -> handle, &context))
837 ABORT("GetThreadContext failed");
839 /* Push all registers that might point into the heap. Frame */
840 /* pointer registers are included in case client code was */
841 /* compiled with the 'omit frame pointer' optimisation. */
842 # define PUSH1(reg) GC_push_one((word)context.reg)
843 # define PUSH2(r1,r2) PUSH1(r1), PUSH1(r2)
844 # define PUSH4(r1,r2,r3,r4) PUSH2(r1,r2), PUSH2(r3,r4)
846 PUSH4(Edi,Esi,Ebx,Edx), PUSH2(Ecx,Eax), PUSH1(Ebp);
847 sp = (ptr_t)context.Esp;
848 # elif defined(X86_64)
849 PUSH4(Rax,Rcx,Rdx,Rbx); PUSH2(Rbp, Rsi); PUSH1(Rdi);
850 PUSH4(R8, R9, R10, R11); PUSH4(R12, R13, R14, R15);
851 sp = (ptr_t)context.Rsp;
852 # elif defined(ARM32)
853 PUSH4(R0,R1,R2,R3),PUSH4(R4,R5,R6,R7),PUSH4(R8,R9,R10,R11),PUSH1(R12);
854 sp = (ptr_t)context.Sp;
856 PUSH4(R0,R1,R2,R3), PUSH4(R4,R5,R6,R7), PUSH4(R8,R9,R10,R11);
857 PUSH2(R12,R13), PUSH1(R14);
858 sp = (ptr_t)context.R15;
860 PUSH4(IntAt,IntV0,IntV1,IntA0), PUSH4(IntA1,IntA2,IntA3,IntT0);
861 PUSH4(IntT1,IntT2,IntT3,IntT4), PUSH4(IntT5,IntT6,IntT7,IntS0);
862 PUSH4(IntS1,IntS2,IntS3,IntS4), PUSH4(IntS5,IntS6,IntS7,IntT8);
863 PUSH4(IntT9,IntK0,IntK1,IntS8);
864 sp = (ptr_t)context.IntSp;
866 PUSH4(Gpr0, Gpr3, Gpr4, Gpr5), PUSH4(Gpr6, Gpr7, Gpr8, Gpr9);
867 PUSH4(Gpr10,Gpr11,Gpr12,Gpr14), PUSH4(Gpr15,Gpr16,Gpr17,Gpr18);
868 PUSH4(Gpr19,Gpr20,Gpr21,Gpr22), PUSH4(Gpr23,Gpr24,Gpr25,Gpr26);
869 PUSH4(Gpr27,Gpr28,Gpr29,Gpr30), PUSH1(Gpr31);
870 sp = (ptr_t)context.Gpr1;
871 # elif defined(ALPHA)
872 PUSH4(IntV0,IntT0,IntT1,IntT2), PUSH4(IntT3,IntT4,IntT5,IntT6);
873 PUSH4(IntT7,IntS0,IntS1,IntS2), PUSH4(IntS3,IntS4,IntS5,IntFp);
874 PUSH4(IntA0,IntA1,IntA2,IntA3), PUSH4(IntA4,IntA5,IntT8,IntT9);
875 PUSH4(IntT10,IntT11,IntT12,IntAt);
876 sp = (ptr_t)context.IntSp;
878 # error "architecture is not supported"
880 } /* ! current thread */
882 stack_min = GC_get_stack_min(thread->stack_base);
884 if (sp >= stack_min && sp < thread->stack_base) {
885 # if DEBUG_WIN32_PTHREADS || DEBUG_WIN32_THREADS \
886 || DEBUG_CYGWIN_THREADS
887 GC_printf("Pushing thread from %p to %p for 0x%x from 0x%x\n",
888 sp, thread -> stack_base, thread -> id, me);
890 GC_push_all_stack(sp, thread->stack_base);
892 WARN("Thread stack pointer 0x%lx out of range, pushing everything\n",
893 (unsigned long)(size_t)sp);
894 GC_push_all_stack(stack_min, thread->stack_base);
896 } /* thread looks live */
899 void GC_push_all_stacks(void)
901 DWORD me = GetCurrentThreadId();
902 GC_bool found_me = FALSE;
905 if (GC_win32_dll_threads) {
907 LONG my_max = GC_get_max_thread_index();
909 for (i = 0; i <= my_max; i++) {
910 GC_thread t = (GC_thread)(dll_thread_table + i);
913 GC_push_stack_for(t);
914 if (t -> id == me) found_me = TRUE;
921 for (i = 0; i < THREAD_TABLE_SZ; i++) {
922 for (t = GC_threads[i]; t != 0; t = t -> next) {
924 if (!KNOWN_FINISHED(t)) GC_push_stack_for(t);
925 if (t -> id == me) found_me = TRUE;
929 if (GC_print_stats == VERBOSE) {
930 GC_log_printf("Pushed %d thread stacks ", nthreads);
931 if (GC_win32_dll_threads) {
932 GC_log_printf("based on DllMain thread tracking\n");
937 if (!found_me && !GC_in_thread_creation)
938 ABORT("Collecting from unknown thread.");
941 void GC_get_next_stack(char *start, char **lo, char **hi)
944 # define ADDR_LIMIT (char *)(-1L)
945 char * current_min = ADDR_LIMIT;
947 if (GC_win32_dll_threads) {
948 LONG my_max = GC_get_max_thread_index();
950 for (i = 0; i <= my_max; i++) {
951 ptr_t s = (ptr_t)(dll_thread_table[i].stack_base);
953 if (0 != s && s > start && s < current_min) {
958 for (i = 0; i < THREAD_TABLE_SZ; i++) {
961 for (t = GC_threads[i]; t != 0; t = t -> next) {
962 ptr_t s = (ptr_t)(t -> stack_base);
964 if (0 != s && s > start && s < current_min) {
971 if (current_min == ADDR_LIMIT) {
975 *lo = GC_get_stack_min(current_min);
976 if (*lo < start) *lo = start;
981 /* We have no DllMain to take care of new threads. Thus we */
982 /* must properly intercept thread creation. */
985 LPTHREAD_START_ROUTINE start;
989 static DWORD WINAPI thread_start(LPVOID arg);
991 void * GC_win32_start_inner(struct GC_stack_base *sb, LPVOID arg)
994 thread_args *args = (thread_args *)arg;
996 # if DEBUG_WIN32_THREADS
997 GC_printf("thread 0x%x starting...\n", GetCurrentThreadId());
1000 GC_register_my_thread(sb); /* This waits for an in-progress GC. */
1002 /* Clear the thread entry even if we exit with an exception. */
1003 /* This is probably pointless, since an uncaught exception is */
1004 /* supposed to result in the process being killed. */
1007 #endif /* __GNUC__ */
1008 ret = (void *)(size_t)args->start (args->param);
1011 #endif /* __GNUC__ */
1012 GC_unregister_my_thread();
1016 #endif /* __GNUC__ */
1018 # if DEBUG_WIN32_THREADS
1019 GC_printf("thread 0x%x returned from start routine.\n",
1020 GetCurrentThreadId());
1025 DWORD WINAPI GC_win32_start(LPVOID arg)
1027 return (DWORD)(size_t)GC_call_with_stack_base(GC_win32_start_inner, arg);
1030 GC_API HANDLE WINAPI GC_CreateThread(
1031 LPSECURITY_ATTRIBUTES lpThreadAttributes,
1032 DWORD dwStackSize, LPTHREAD_START_ROUTINE lpStartAddress,
1033 LPVOID lpParameter, DWORD dwCreationFlags, LPDWORD lpThreadId )
1035 HANDLE thread_h = NULL;
1039 if (!parallel_initialized) GC_init_parallel();
1040 /* make sure GC is initialized (i.e. main thread is attached,
1043 # if DEBUG_WIN32_THREADS
1044 GC_printf("About to create a thread from 0x%x\n", GetCurrentThreadId());
1046 if (GC_win32_dll_threads) {
1047 return CreateThread(lpThreadAttributes, dwStackSize, lpStartAddress,
1048 lpParameter, dwCreationFlags, lpThreadId);
1050 args = GC_malloc_uncollectable(sizeof(thread_args));
1051 /* Handed off to and deallocated by child thread. */
1053 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
1057 /* set up thread arguments */
1058 args -> start = lpStartAddress;
1059 args -> param = lpParameter;
1061 GC_need_to_lock = TRUE;
1062 thread_h = CreateThread(lpThreadAttributes,
1063 dwStackSize, GC_win32_start,
1064 args, dwCreationFlags,
1066 if( thread_h == 0 ) GC_free( args );
1071 void WINAPI GC_ExitThread(DWORD dwExitCode)
1073 GC_unregister_my_thread();
1074 ExitThread(dwExitCode);
1077 uintptr_t GC_beginthreadex(
1078 void *security, unsigned stack_size,
1079 unsigned ( __stdcall *start_address )( void * ),
1080 void *arglist, unsigned initflag, unsigned *thrdaddr)
1082 uintptr_t thread_h = -1L;
1086 if (!parallel_initialized) GC_init_parallel();
1087 /* make sure GC is initialized (i.e. main thread is attached,
1089 # if DEBUG_WIN32_THREADS
1090 GC_printf("About to create a thread from 0x%x\n", GetCurrentThreadId());
1093 if (GC_win32_dll_threads) {
1094 return _beginthreadex(security, stack_size, start_address,
1095 arglist, initflag, thrdaddr);
1097 args = GC_malloc_uncollectable(sizeof(thread_args));
1098 /* Handed off to and deallocated by child thread. */
1100 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
1101 return (uintptr_t)(-1);
1104 /* set up thread arguments */
1105 args -> start = (LPTHREAD_START_ROUTINE)start_address;
1106 args -> param = arglist;
1108 GC_need_to_lock = TRUE;
1109 thread_h = _beginthreadex(security, stack_size,
1110 (unsigned (__stdcall *) (void *))GC_win32_start,
1111 args, initflag, thrdaddr);
1112 if( thread_h == 0 ) GC_free( args );
1117 void GC_endthreadex(unsigned retval)
1119 GC_unregister_my_thread();
1120 _endthreadex(retval);
1123 #endif /* !GC_PTHREADS */
1128 HINSTANCE hInstance;
1129 HINSTANCE hPrevInstance;
1134 DWORD WINAPI main_thread_start(LPVOID arg);
1136 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
1137 LPWSTR lpCmdLine, int nShowCmd)
1139 DWORD exit_code = 1;
1141 main_thread_args args = {
1142 hInstance, hPrevInstance, lpCmdLine, nShowCmd
1147 /* initialize everything */
1150 /* start the main thread */
1151 thread_h = GC_CreateThread(
1152 NULL, 0, main_thread_start, &args, 0, &thread_id);
1154 if (thread_h != NULL)
1156 WaitForSingleObject (thread_h, INFINITE);
1157 GetExitCodeThread (thread_h, &exit_code);
1158 CloseHandle (thread_h);
1162 DeleteCriticalSection(&GC_allocate_ml);
1164 return (int) exit_code;
1167 DWORD WINAPI main_thread_start(LPVOID arg)
1169 main_thread_args * args = (main_thread_args *) arg;
1171 return (DWORD) GC_WinMain (args->hInstance, args->hPrevInstance,
1172 args->lpCmdLine, args->nShowCmd);
1175 # else /* !MSWINCE */
1177 /* Called by GC_init() - we hold the allocation lock. */
1178 void GC_thr_init(void) {
1179 struct GC_stack_base sb;
1182 GC_ASSERT(I_HOLD_LOCK());
1183 if (GC_thr_initialized) return;
1184 GC_main_thread = GetCurrentThreadId();
1185 GC_thr_initialized = TRUE;
1187 /* Add the initial thread, so we can stop it. */
1188 sb_result = GC_get_stack_base(&sb);
1189 GC_ASSERT(sb_result == GC_SUCCESS);
1190 GC_register_my_thread(&sb);
1196 void *(*start_routine)(void *);
1201 int GC_pthread_join(pthread_t pthread_id, void **retval) {
1206 # if DEBUG_CYGWIN_THREADS
1207 GC_printf("thread 0x%x(0x%x) is joining thread 0x%x.\n",
1208 (int)pthread_self(), GetCurrentThreadId(), (int)pthread_id);
1210 # if DEBUG_WIN32_PTHREADS
1211 GC_printf("thread 0x%x(0x%x) is joining thread 0x%x.\n",
1212 (int)(pthread_self()).p, GetCurrentThreadId(), pthread_id.p);
1215 if (!parallel_initialized) GC_init_parallel();
1216 /* Thread being joined might not have registered itself yet. */
1217 /* After the join,thread id may have been recycled. */
1218 /* FIXME: It would be better if this worked more like */
1219 /* pthread_support.c. */
1221 #ifndef GC_WIN32_PTHREADS
1222 while ((joinee = GC_lookup_pthread(pthread_id)) == 0) Sleep(10);
1225 result = pthread_join(pthread_id, retval);
1227 #ifdef GC_WIN32_PTHREADS
1228 /* win32_pthreads id are unique */
1229 joinee = GC_lookup_pthread(pthread_id);
1232 if (!GC_win32_dll_threads) {
1234 GC_delete_gc_thread(joinee);
1236 } /* otherwise dllmain handles it. */
1238 # if DEBUG_CYGWIN_THREADS
1239 GC_printf("thread 0x%x(0x%x) completed join with thread 0x%x.\n",
1240 (int)pthread_self(), GetCurrentThreadId(), (int)pthread_id);
1242 # if DEBUG_WIN32_PTHREADS
1243 GC_printf("thread 0x%x(0x%x) completed join with thread 0x%x.\n",
1244 (int)(pthread_self()).p, GetCurrentThreadId(), pthread_id.p);
1250 /* Cygwin-pthreads calls CreateThread internally, but it's not
1251 * easily interceptible by us..
1252 * so intercept pthread_create instead
1255 GC_pthread_create(pthread_t *new_thread,
1256 const pthread_attr_t *attr,
1257 void *(*start_routine)(void *), void *arg) {
1259 struct start_info * si;
1261 if (!parallel_initialized) GC_init_parallel();
1262 /* make sure GC is initialized (i.e. main thread is attached) */
1263 if (GC_win32_dll_threads) {
1264 return pthread_create(new_thread, attr, start_routine, arg);
1267 /* This is otherwise saved only in an area mmapped by the thread */
1268 /* library, which isn't visible to the collector. */
1269 si = GC_malloc_uncollectable(sizeof(struct start_info));
1270 if (0 == si) return(EAGAIN);
1272 si -> start_routine = start_routine;
1275 pthread_attr_getdetachstate(attr, &si->detached)
1276 == PTHREAD_CREATE_DETACHED) {
1277 si->detached = TRUE;
1280 # if DEBUG_CYGWIN_THREADS
1281 GC_printf("About to create a thread from 0x%x(0x%x)\n",
1282 (int)pthread_self(), GetCurrentThreadId);
1284 # if DEBUG_WIN32_PTHREADS
1285 GC_printf("About to create a thread from 0x%x(0x%x)\n",
1286 (int)(pthread_self()).p, GetCurrentThreadId());
1288 GC_need_to_lock = TRUE;
1289 result = pthread_create(new_thread, attr, GC_pthread_start, si);
1291 if (result) { /* failure */
1298 void * GC_pthread_start_inner(struct GC_stack_base *sb, void * arg)
1300 struct start_info * si = arg;
1302 void *(*start)(void *);
1304 DWORD thread_id = GetCurrentThreadId();
1305 pthread_t pthread_id = pthread_self();
1310 # if DEBUG_CYGWIN_THREADS
1311 GC_printf("thread 0x%x(0x%x) starting...\n",(int)pthread_id,
1314 # if DEBUG_WIN32_PTHREADS
1315 GC_printf("thread 0x%x(0x%x) starting...\n",(int) pthread_id.p,
1319 GC_ASSERT(!GC_win32_dll_threads);
1320 /* If a GC occurs before the thread is registered, that GC will */
1321 /* ignore this thread. That's fine, since it will block trying to */
1322 /* acquire the allocation lock, and won't yet hold interesting */
1325 /* We register the thread here instead of in the parent, so that */
1326 /* we don't need to hold the allocation lock during pthread_create. */
1327 me = GC_register_my_thread_inner(sb, thread_id);
1328 SET_PTHREAD_MAP_CACHE(pthread_id, thread_id);
1331 start = si -> start_routine;
1332 start_arg = si -> arg;
1333 if (si-> detached) me -> flags |= DETACHED;
1334 me -> pthread_id = pthread_id;
1336 GC_free(si); /* was allocated uncollectable */
1338 pthread_cleanup_push(GC_thread_exit_proc, (void *)me);
1339 result = (*start)(start_arg);
1340 me -> status = result;
1341 pthread_cleanup_pop(1);
1343 # if DEBUG_CYGWIN_THREADS
1344 GC_printf("thread 0x%x(0x%x) returned from start routine.\n",
1345 (int)pthread_self(),GetCurrentThreadId());
1347 # if DEBUG_WIN32_PTHREADS
1348 GC_printf("thread 0x%x(0x%x) returned from start routine.\n",
1349 (int)(pthread_self()).p, GetCurrentThreadId());
1355 void * GC_pthread_start(void * arg)
1357 return GC_call_with_stack_base(GC_pthread_start_inner, arg);
1360 void GC_thread_exit_proc(void *arg)
1362 GC_thread me = (GC_thread)arg;
1365 GC_ASSERT(!GC_win32_dll_threads);
1366 # if DEBUG_CYGWIN_THREADS
1367 GC_printf("thread 0x%x(0x%x) called pthread_exit().\n",
1368 (int)pthread_self(),GetCurrentThreadId());
1370 # if DEBUG_WIN32_PTHREADS
1371 GC_printf("thread 0x%x(0x%x) called pthread_exit().\n",
1372 (int)(pthread_self()).p,GetCurrentThreadId());
1376 # if defined(THREAD_LOCAL_ALLOC)
1377 GC_destroy_thread_local(&(me->tlfs));
1379 if (me -> flags & DETACHED) {
1380 GC_delete_thread(GetCurrentThreadId());
1382 /* deallocate it as part of join */
1383 me -> flags |= FINISHED;
1388 #ifndef GC_WIN32_PTHREADS
1389 /* win32 pthread does not support sigmask */
1390 /* nothing required here... */
1391 int GC_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset) {
1392 if (!parallel_initialized) GC_init_parallel();
1393 return pthread_sigmask(how, set, oset);
1397 int GC_pthread_detach(pthread_t thread)
1400 GC_thread thread_gc_id;
1402 if (!parallel_initialized) GC_init_parallel();
1404 thread_gc_id = GC_lookup_pthread(thread);
1406 result = pthread_detach(thread);
1409 thread_gc_id -> flags |= DETACHED;
1410 /* Here the pthread thread id may have been recycled. */
1411 if (thread_gc_id -> flags & FINISHED) {
1412 GC_delete_gc_thread(thread_gc_id);
1419 #else /* !GC_PTHREADS */
1422 * We avoid acquiring locks here, since this doesn't seem to be preemptable.
1423 * This may run with an uninitialized collector, in which case we don't do much.
1424 * This implies that no threads other than the main one should be created
1425 * with an uninitialized collector. (The alternative of initializing
1426 * the collector here seems dangerous, since DllMain is limited in what it
1430 GC_API BOOL WINAPI DllMain(HINSTANCE inst, ULONG reason, LPVOID reserved)
1432 struct GC_stack_base sb;
1435 static int entry_count = 0;
1437 if (parallel_initialized && !GC_win32_dll_threads) return TRUE;
1440 case DLL_THREAD_ATTACH:
1441 GC_ASSERT(entry_count == 0 || parallel_initialized);
1442 ++entry_count; /* and fall through: */
1443 case DLL_PROCESS_ATTACH:
1444 /* This may run with the collector uninitialized. */
1445 thread_id = GetCurrentThreadId();
1446 if (parallel_initialized && GC_main_thread != thread_id) {
1447 /* Don't lock here. */
1448 sb_result = GC_get_stack_base(&sb);
1449 GC_ASSERT(sb_result == GC_SUCCESS);
1450 # ifdef THREAD_LOCAL_ALLOC
1451 ABORT("Cannot initialize thread local cache from DllMain");
1453 GC_register_my_thread_inner(&sb, thread_id);
1454 } /* o.w. we already did it during GC_thr_init(), called by GC_init() */
1457 case DLL_THREAD_DETACH:
1458 /* We are hopefully running in the context of the exiting thread. */
1459 GC_ASSERT(parallel_initialized);
1460 if (!GC_win32_dll_threads) return TRUE;
1461 GC_delete_thread(GetCurrentThreadId());
1464 case DLL_PROCESS_DETACH:
1468 if (!GC_win32_dll_threads) return TRUE;
1469 for (i = 0; i <= GC_get_max_thread_index(); ++i)
1471 if (AO_load(&(dll_thread_table[i].in_use)))
1472 GC_delete_gc_thread(dll_thread_table + i);
1476 DeleteCriticalSection(&GC_allocate_ml);
1484 #endif /* !GC_PTHREADS */
1486 # endif /* !MSWINCE */
1488 /* Perform all initializations, including those that */
1489 /* may require allocation. */
1490 /* Called without allocation lock. */
1491 /* Must be called before a second thread is created. */
1492 void GC_init_parallel(void)
1494 if (parallel_initialized) return;
1495 parallel_initialized = TRUE;
1496 /* GC_init() calls us back, so set flag first. */
1498 if (!GC_is_initialized) GC_init();
1499 if (GC_win32_dll_threads) {
1500 GC_need_to_lock = TRUE;
1501 /* Cannot intercept thread creation. Hence we don't know if other */
1502 /* threads exist. However, client is not allowed to create other */
1503 /* threads before collector initialization. Thus it's OK not to */
1504 /* lock before this. */
1506 /* Initialize thread local free lists if used. */
1507 # if defined(THREAD_LOCAL_ALLOC)
1509 GC_init_thread_local(&(GC_lookup_thread(GetCurrentThreadId())->tlfs));
1514 #if defined(USE_PTHREAD_LOCKS)
1515 /* Support for pthread locking code. */
1516 /* Pthread_mutex_try_lock may not win here, */
1517 /* due to builtinsupport for spinning first? */
1519 volatile GC_bool GC_collecting = 0;
1520 /* A hint that we're in the collector and */
1521 /* holding the allocation lock for an */
1522 /* extended period. */
1526 pthread_mutex_lock(&GC_allocate_ml);
1528 #endif /* USE_PTHREAD ... */
1530 # if defined(THREAD_LOCAL_ALLOC)
1532 /* Add thread-local allocation support. Microsoft uses __declspec(thread) */
1534 /* We must explicitly mark ptrfree and gcj free lists, since the free */
1535 /* list links wouldn't otherwise be found. We also set them in the */
1536 /* normal free lists, since that involves touching less memory than if */
1537 /* we scanned them normally. */
1538 void GC_mark_thread_local_free_lists(void)
1543 for (i = 0; i < THREAD_TABLE_SZ; ++i) {
1544 for (p = GC_threads[i]; 0 != p; p = p -> next) {
1545 GC_mark_thread_local_fls_for(&(p->tlfs));
1550 #if defined(GC_ASSERTIONS)
1551 /* Check that all thread-local free-lists are completely marked. */
1552 /* also check that thread-specific-data structures are marked. */
1553 void GC_check_tls(void) {
1557 for (i = 0; i < THREAD_TABLE_SZ; ++i) {
1558 for (p = GC_threads[i]; 0 != p; p = p -> next) {
1559 GC_check_tls_for(&(p->tlfs));
1562 # if defined(USE_CUSTOM_SPECIFIC)
1563 if (GC_thread_key != 0)
1564 GC_check_tsd_marks(GC_thread_key);
1567 #endif /* GC_ASSERTIONS */
1569 #endif /* THREAD_LOCAL_ALLOC ... */
1571 #endif /* GC_WIN32_THREADS */