#if defined(GC_WIN32_THREADS) #include "private/gc_priv.h" #ifdef CYGWIN32 # include /* Cygwin-specific forward decls */ # undef pthread_create # undef pthread_sigmask # undef pthread_join # undef dlopen # define DEBUG_CYGWIN_THREADS 0 GC_bool GC_thr_initialized = FALSE; void * GC_start_routine(void * arg); void GC_thread_exit_proc(void *arg); #endif #if 0 #define STRICT #include #endif #define MAX_THREADS 64 struct thread_entry { LONG in_use; DWORD id; HANDLE handle; void *stack; /* The cold end of the stack. */ /* 0 ==> entry not valid. */ /* !in_use ==> stack == 0 */ CONTEXT context; GC_bool suspended; # ifdef CYGWIN32 void *status; /* hold exit value until join in case it's a pointer */ pthread_t pthread_id; # endif }; volatile GC_bool GC_please_stop = FALSE; volatile struct thread_entry thread_table[MAX_THREADS]; void GC_push_thread_structures GC_PROTO((void)) { /* Unlike the other threads implementations, the thread table here */ /* contains no pointers to the collectable heap. Thus we have */ /* no private structures we need to preserve. */ # ifdef CYGWIN32 { int i; /* pthreads may keep a pointer in the thread exit value */ for (i = 0; i < MAX_THREADS; i++) if (thread_table[i].in_use) GC_push_all((ptr_t)&(thread_table[i].status),(ptr_t)(&(thread_table[i].status)+1)); } # endif } void GC_stop_world() { DWORD thread_id = GetCurrentThreadId(); int i; #ifdef CYGWIN32 if (!GC_thr_initialized) ABORT("GC_stop_world() called before GC_thr_init()"); #endif GC_please_stop = TRUE; for (i = 0; i < MAX_THREADS; i++) if (thread_table[i].stack != 0 && thread_table[i].id != thread_id) { # ifdef MSWINCE /* SuspendThread will fail if thread is running kernel code */ while (SuspendThread(thread_table[i].handle) == (DWORD)-1) Sleep(10); # else /* Apparently the Windows 95 GetOpenFileName call creates */ /* a thread that does not properly get cleaned up, and */ /* SuspendThread on its descriptor may provoke a crash. */ /* This reduces the probability of that event, though it still */ /* appears there's a race here. */ DWORD exitCode; if (GetExitCodeThread(thread_table[i].handle,&exitCode) && exitCode != STILL_ACTIVE) { thread_table[i].stack = 0; /* prevent stack from being pushed */ # ifndef CYGWIN32 /* this breaks pthread_join on Cygwin, which is guaranteed to */ /* only see user pthreads */ thread_table[i].in_use = FALSE; CloseHandle(thread_table[i].handle); BZERO((void *)(&thread_table[i].context), sizeof(CONTEXT)); # endif continue; } if (SuspendThread(thread_table[i].handle) == (DWORD)-1) ABORT("SuspendThread failed"); # endif thread_table[i].suspended = TRUE; } } void GC_start_world() { DWORD thread_id = GetCurrentThreadId(); int i; for (i = 0; i < MAX_THREADS; i++) if (thread_table[i].stack != 0 && thread_table[i].suspended && thread_table[i].id != thread_id) { if (ResumeThread(thread_table[i].handle) == (DWORD)-1) ABORT("ResumeThread failed"); thread_table[i].suspended = FALSE; } GC_please_stop = FALSE; } # ifdef _MSC_VER # pragma warning(disable:4715) # endif ptr_t GC_current_stackbottom() { DWORD thread_id = GetCurrentThreadId(); int i; for (i = 0; i < MAX_THREADS; i++) if (thread_table[i].stack && thread_table[i].id == thread_id) return thread_table[i].stack; ABORT("no thread table entry for current thread"); } # ifdef _MSC_VER # pragma warning(default:4715) # endif # ifdef MSWINCE /* The VirtualQuery calls below won't work properly on WinCE, but */ /* since each stack is restricted to an aligned 64K region of */ /* virtual memory we can just take the next lowest multiple of 64K. */ # define GC_get_lo_stack_addr(s) \ ((ptr_t)(((DWORD)(s) - 1) & 0xFFFF0000)) # else static ptr_t GC_get_lo_stack_addr(ptr_t s) { ptr_t bottom; MEMORY_BASIC_INFORMATION info; VirtualQuery(s, &info, sizeof(info)); do { bottom = info.BaseAddress; VirtualQuery(bottom - 1, &info, sizeof(info)); } while ((info.Protect & PAGE_READWRITE) && !(info.Protect & PAGE_GUARD)); return(bottom); } # endif void GC_push_all_stacks() { DWORD thread_id = GetCurrentThreadId(); int i; for (i = 0; i < MAX_THREADS; i++) if (thread_table[i].stack) { ptr_t bottom = GC_get_lo_stack_addr(thread_table[i].stack); if (thread_table[i].id == thread_id) GC_push_all_stack((ptr_t)&i, thread_table[i].stack); else { thread_table[i].context.ContextFlags = (CONTEXT_INTEGER|CONTEXT_CONTROL); if (!GetThreadContext(thread_table[i].handle, /* cast away volatile qualifier */ (LPCONTEXT)&thread_table[i].context)) ABORT("GetThreadContext failed"); # ifdef I386 GC_push_one ((word) thread_table[i].context.Edi); GC_push_one ((word) thread_table[i].context.Esi); GC_push_one ((word) thread_table[i].context.Ebp); GC_push_one ((word) thread_table[i].context.Ebx); GC_push_one ((word) thread_table[i].context.Edx); GC_push_one ((word) thread_table[i].context.Ecx); GC_push_one ((word) thread_table[i].context.Eax); if (thread_table[i].context.Esp >= (DWORD)thread_table[i].stack || thread_table[i].context.Esp < (DWORD)bottom) { WARN("Thread stack pointer 0x%lx out of range, pushing everything", thread_table[i].context.Esp); GC_push_all_stack((char *) bottom, thread_table[i].stack); } else { GC_push_all_stack((char *) thread_table[i].context.Esp, thread_table[i].stack); } # else # ifdef ARM32 if (thread_table[i].context.Sp >= (DWORD)thread_table[i].stack || thread_table[i].context.Sp < (DWORD)bottom) ABORT("Thread stack pointer out of range"); GC_push_one ((word) thread_table[i].context.R0); GC_push_one ((word) thread_table[i].context.R1); GC_push_one ((word) thread_table[i].context.R2); GC_push_one ((word) thread_table[i].context.R3); GC_push_one ((word) thread_table[i].context.R4); GC_push_one ((word) thread_table[i].context.R5); GC_push_one ((word) thread_table[i].context.R6); GC_push_one ((word) thread_table[i].context.R7); GC_push_one ((word) thread_table[i].context.R8); GC_push_one ((word) thread_table[i].context.R9); GC_push_one ((word) thread_table[i].context.R10); GC_push_one ((word) thread_table[i].context.R11); GC_push_one ((word) thread_table[i].context.R12); GC_push_all_stack((char *) thread_table[i].context.Sp, thread_table[i].stack); # else # ifdef SHx if (thread_table[i].context.R15 >= (DWORD)thread_table[i].stack || thread_table[i].context.R15 < (DWORD)bottom) ABORT("Thread stack pointer out of range"); GC_push_one ((word) thread_table[i].context.R0); GC_push_one ((word) thread_table[i].context.R1); GC_push_one ((word) thread_table[i].context.R2); GC_push_one ((word) thread_table[i].context.R3); GC_push_one ((word) thread_table[i].context.R4); GC_push_one ((word) thread_table[i].context.R5); GC_push_one ((word) thread_table[i].context.R6); GC_push_one ((word) thread_table[i].context.R7); GC_push_one ((word) thread_table[i].context.R8); GC_push_one ((word) thread_table[i].context.R9); GC_push_one ((word) thread_table[i].context.R10); GC_push_one ((word) thread_table[i].context.R11); GC_push_one ((word) thread_table[i].context.R12); GC_push_one ((word) thread_table[i].context.R13); GC_push_one ((word) thread_table[i].context.R14); GC_push_all_stack((char *) thread_table[i].context.R15, thread_table[i].stack); # else # ifdef MIPS if (thread_table[i].context.IntSp >= (DWORD)thread_table[i].stack || thread_table[i].context.IntSp < (DWORD)bottom) ABORT("Thread stack pointer out of range"); GC_push_one ((word) thread_table[i].context.IntAt); GC_push_one ((word) thread_table[i].context.IntV0); GC_push_one ((word) thread_table[i].context.IntV1); GC_push_one ((word) thread_table[i].context.IntA0); GC_push_one ((word) thread_table[i].context.IntA1); GC_push_one ((word) thread_table[i].context.IntA2); GC_push_one ((word) thread_table[i].context.IntA3); GC_push_one ((word) thread_table[i].context.IntT0); GC_push_one ((word) thread_table[i].context.IntT1); GC_push_one ((word) thread_table[i].context.IntT2); GC_push_one ((word) thread_table[i].context.IntT3); GC_push_one ((word) thread_table[i].context.IntT4); GC_push_one ((word) thread_table[i].context.IntT5); GC_push_one ((word) thread_table[i].context.IntT6); GC_push_one ((word) thread_table[i].context.IntT7); GC_push_one ((word) thread_table[i].context.IntS0); GC_push_one ((word) thread_table[i].context.IntS1); GC_push_one ((word) thread_table[i].context.IntS2); GC_push_one ((word) thread_table[i].context.IntS3); GC_push_one ((word) thread_table[i].context.IntS4); GC_push_one ((word) thread_table[i].context.IntS5); GC_push_one ((word) thread_table[i].context.IntS6); GC_push_one ((word) thread_table[i].context.IntS7); GC_push_one ((word) thread_table[i].context.IntT8); GC_push_one ((word) thread_table[i].context.IntT9); GC_push_one ((word) thread_table[i].context.IntK0); GC_push_one ((word) thread_table[i].context.IntK1); GC_push_one ((word) thread_table[i].context.IntS8); GC_push_all_stack((char *) thread_table[i].context.IntSp, thread_table[i].stack); # else # ifdef PPC if (thread_table[i].context.Gpr1 >= (DWORD)thread_table[i].stack || thread_table[i].context.Gpr1 < (DWORD)bottom) ABORT("Thread stack pointer out of range"); GC_push_one ((word) thread_table[i].context.Gpr0); /* Gpr1 is stack pointer */ /* Gpr2 is global pointer */ GC_push_one ((word) thread_table[i].context.Gpr3); GC_push_one ((word) thread_table[i].context.Gpr4); GC_push_one ((word) thread_table[i].context.Gpr5); GC_push_one ((word) thread_table[i].context.Gpr6); GC_push_one ((word) thread_table[i].context.Gpr7); GC_push_one ((word) thread_table[i].context.Gpr8); GC_push_one ((word) thread_table[i].context.Gpr9); GC_push_one ((word) thread_table[i].context.Gpr10); GC_push_one ((word) thread_table[i].context.Gpr11); GC_push_one ((word) thread_table[i].context.Gpr12); /* Gpr13 is reserved for the kernel */ GC_push_one ((word) thread_table[i].context.Gpr14); GC_push_one ((word) thread_table[i].context.Gpr15); GC_push_one ((word) thread_table[i].context.Gpr16); GC_push_one ((word) thread_table[i].context.Gpr17); GC_push_one ((word) thread_table[i].context.Gpr18); GC_push_one ((word) thread_table[i].context.Gpr19); GC_push_one ((word) thread_table[i].context.Gpr20); GC_push_one ((word) thread_table[i].context.Gpr21); GC_push_one ((word) thread_table[i].context.Gpr22); GC_push_one ((word) thread_table[i].context.Gpr23); GC_push_one ((word) thread_table[i].context.Gpr24); GC_push_one ((word) thread_table[i].context.Gpr25); GC_push_one ((word) thread_table[i].context.Gpr26); GC_push_one ((word) thread_table[i].context.Gpr27); GC_push_one ((word) thread_table[i].context.Gpr28); GC_push_one ((word) thread_table[i].context.Gpr29); GC_push_one ((word) thread_table[i].context.Gpr30); GC_push_one ((word) thread_table[i].context.Gpr31); GC_push_all_stack((char *) thread_table[i].context.Gpr1, thread_table[i].stack); # else # ifdef ALPHA if (thread_table[i].context.IntSp >= (DWORD)thread_table[i].stack || thread_table[i].context.IntSp < (DWORD)bottom) ABORT("Thread stack pointer out of range"); GC_push_one ((word) thread_table[i].context.IntV0); GC_push_one ((word) thread_table[i].context.IntT0); GC_push_one ((word) thread_table[i].context.IntT1); GC_push_one ((word) thread_table[i].context.IntT2); GC_push_one ((word) thread_table[i].context.IntT3); GC_push_one ((word) thread_table[i].context.IntT4); GC_push_one ((word) thread_table[i].context.IntT5); GC_push_one ((word) thread_table[i].context.IntT6); GC_push_one ((word) thread_table[i].context.IntT7); GC_push_one ((word) thread_table[i].context.IntS0); GC_push_one ((word) thread_table[i].context.IntS1); GC_push_one ((word) thread_table[i].context.IntS2); GC_push_one ((word) thread_table[i].context.IntS3); GC_push_one ((word) thread_table[i].context.IntS4); GC_push_one ((word) thread_table[i].context.IntS5); GC_push_one ((word) thread_table[i].context.IntFp); GC_push_one ((word) thread_table[i].context.IntA0); GC_push_one ((word) thread_table[i].context.IntA1); GC_push_one ((word) thread_table[i].context.IntA2); GC_push_one ((word) thread_table[i].context.IntA3); GC_push_one ((word) thread_table[i].context.IntA4); GC_push_one ((word) thread_table[i].context.IntA5); GC_push_one ((word) thread_table[i].context.IntT8); GC_push_one ((word) thread_table[i].context.IntT9); GC_push_one ((word) thread_table[i].context.IntT10); GC_push_one ((word) thread_table[i].context.IntT11); GC_push_one ((word) thread_table[i].context.IntT12); GC_push_one ((word) thread_table[i].context.IntAt); GC_push_all_stack((char *) thread_table[i].context.IntSp, thread_table[i].stack); # else --> architecture not supported # endif /* !ALPHA */ # endif /* !PPC */ # endif /* !MIPS */ # endif /* !SHx */ # endif /* !ARM32 */ # endif /* !I386 */ } } } void GC_get_next_stack(char *start, char **lo, char **hi) { int i; # define ADDR_LIMIT (char *)(-1L) char * current_min = ADDR_LIMIT; for (i = 0; i < MAX_THREADS; i++) { char * s = (char *)thread_table[i].stack; if (0 != s && s > start && s < current_min) { current_min = s; } } *hi = current_min; if (current_min == ADDR_LIMIT) { *lo = ADDR_LIMIT; return; } *lo = GC_get_lo_stack_addr(current_min); if (*lo < start) *lo = start; } #if !defined(MSWINCE) && !(defined(__MINGW32__) && !defined(_DLL)) HANDLE WINAPI GC_CreateThread( LPSECURITY_ATTRIBUTES lpThreadAttributes, DWORD dwStackSize, LPTHREAD_START_ROUTINE lpStartAddress, LPVOID lpParameter, DWORD dwCreationFlags, LPDWORD lpThreadId ) { return CreateThread(lpThreadAttributes, dwStackSize, lpStartAddress, lpParameter, dwCreationFlags, lpThreadId); } #else /* !defined(MSWINCE) && !(defined(__MINGW32__) && !defined(_DLL)) */ typedef struct { HANDLE child_ready_h, parent_ready_h; volatile struct thread_entry * entry; LPTHREAD_START_ROUTINE start; LPVOID param; } thread_args; DWORD WINAPI thread_start(LPVOID arg); HANDLE WINAPI GC_CreateThread( LPSECURITY_ATTRIBUTES lpThreadAttributes, DWORD dwStackSize, LPTHREAD_START_ROUTINE lpStartAddress, LPVOID lpParameter, DWORD dwCreationFlags, LPDWORD lpThreadId ) { HANDLE thread_h = NULL; HANDLE child_ready_h, parent_ready_h; int i; thread_args args; /* allocate thread slot */ LOCK(); for (i = 0; i != MAX_THREADS && thread_table[i].in_use; i++) ; if (i != MAX_THREADS) { thread_table[i].in_use = TRUE; } UNLOCK(); if (i != MAX_THREADS) { /* create unnamed unsignalled events */ if (child_ready_h = CreateEvent(NULL, FALSE, FALSE, NULL)) { if (parent_ready_h = CreateEvent(NULL, FALSE, FALSE, NULL)) { /* set up thread arguments */ args.child_ready_h = child_ready_h; args.parent_ready_h = parent_ready_h; args.entry = &thread_table[i]; args.start = lpStartAddress; args.param = lpParameter; thread_h = CreateThread(lpThreadAttributes, dwStackSize, thread_start, &args, dwCreationFlags & ~CREATE_SUSPENDED, lpThreadId); if (thread_h) { /* fill in ID and handle; tell child this is done */ thread_table[i].id = *lpThreadId; thread_table[i].handle = thread_h; SetEvent (parent_ready_h); /* wait for child to fill in stack and copy args */ WaitForSingleObject (child_ready_h, INFINITE); /* suspend the child if requested */ if (dwCreationFlags & CREATE_SUSPENDED) SuspendThread (thread_h); /* let child call given function now (or when resumed) */ SetEvent (parent_ready_h); } else { CloseHandle (parent_ready_h); } } } CloseHandle (child_ready_h); if (thread_h == NULL) thread_table[i].in_use = FALSE; } else { /* no thread slot found */ SetLastError (ERROR_TOO_MANY_TCBS); } return thread_h; } static DWORD WINAPI thread_start(LPVOID arg) { DWORD ret = 0; thread_args args = *(thread_args *)arg; /* wait for parent to fill in ID and handle */ WaitForSingleObject (args.parent_ready_h, INFINITE); ResetEvent (args.parent_ready_h); /* fill in stack; tell parent this is done */ args.entry->stack = GC_get_stack_base(); SetEvent (args.child_ready_h); /* wait for parent to tell us to go (in case it needs to suspend us) */ WaitForSingleObject (args.parent_ready_h, INFINITE); CloseHandle (args.parent_ready_h); /* Clear the thread entry even if we exit with an exception. */ /* This is probably pointless, since an uncaught exception is */ /* supposed to result in the process being killed. */ #ifndef __GNUC__ __try { #endif /* __GNUC__ */ ret = args.start (args.param); #ifndef __GNUC__ } __finally { #endif /* __GNUC__ */ LOCK(); args.entry->stack = 0; args.entry->in_use = FALSE; /* cast away volatile qualifier */ BZERO((void *) &args.entry->context, sizeof(CONTEXT)); UNLOCK(); #ifndef __GNUC__ } #endif /* __GNUC__ */ return ret; } #endif /* !defined(MSWINCE) && !(defined(__MINGW32__) && !defined(_DLL)) */ #ifdef MSWINCE typedef struct { HINSTANCE hInstance; HINSTANCE hPrevInstance; LPWSTR lpCmdLine; int nShowCmd; } main_thread_args; DWORD WINAPI main_thread_start(LPVOID arg); int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nShowCmd) { DWORD exit_code = 1; main_thread_args args = { hInstance, hPrevInstance, lpCmdLine, nShowCmd }; HANDLE thread_h; DWORD thread_id; /* initialize everything */ InitializeCriticalSection(&GC_allocate_ml); GC_init(); /* start the main thread */ thread_h = GC_CreateThread( NULL, 0, main_thread_start, &args, 0, &thread_id); if (thread_h != NULL) { WaitForSingleObject (thread_h, INFINITE); GetExitCodeThread (thread_h, &exit_code); CloseHandle (thread_h); } GC_deinit(); DeleteCriticalSection(&GC_allocate_ml); return (int) exit_code; } DWORD WINAPI main_thread_start(LPVOID arg) { main_thread_args * args = (main_thread_args *) arg; return (DWORD) GC_WinMain (args->hInstance, args->hPrevInstance, args->lpCmdLine, args->nShowCmd); } # else /* !MSWINCE */ LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info); /* threadAttach/threadDetach routines used by both CYGWIN and DLL implementation, since both recieve explicit notification on thread creation/destruction */ void threadAttach() { int i; /* It appears to be unsafe to acquire a lock here, since this */ /* code is apparently not preeemptible on some systems. */ /* (This is based on complaints, not on Microsoft's official */ /* documentation, which says this should perform "only simple */ /* inititalization tasks".) */ /* Hence we make do with nonblocking synchronization. */ /* The following should be a noop according to the win32 */ /* documentation. There is empirical evidence that it */ /* isn't. - HB */ # if defined(MPROTECT_VDB) if (GC_incremental) SetUnhandledExceptionFilter(GC_write_fault_handler); # endif /* cast away volatile qualifier */ for (i = 0; InterlockedExchange((LONG*)&thread_table[i].in_use,1) != 0; i++) { /* Compare-and-swap would make this cleaner, but that's not */ /* supported before Windows 98 and NT 4.0. In Windows 2000, */ /* InterlockedExchange is supposed to be replaced by */ /* InterlockedExchangePointer, but that's not really what I */ /* want here. */ if (i == MAX_THREADS - 1) ABORT("too many threads"); } thread_table[i].id = GetCurrentThreadId(); # ifdef CYGWIN32 thread_table[i].pthread_id = pthread_self(); # endif if (!DuplicateHandle(GetCurrentProcess(), GetCurrentThread(), GetCurrentProcess(), (HANDLE*)&thread_table[i].handle, 0, 0, DUPLICATE_SAME_ACCESS)) { DWORD last_error = GetLastError(); GC_printf1("Last error code: %lx\n", last_error); ABORT("DuplicateHandle failed"); } thread_table[i].stack = GC_get_stack_base(); if (thread_table[i].stack == NULL) ABORT("Failed to find stack base in threadAttach"); /* If this thread is being created while we are trying to stop */ /* the world, wait here. Hopefully this can't happen on any */ /* systems that don't allow us to block here. */ while (GC_please_stop) Sleep(20); } void threadDetach(DWORD thread_id) { int i; LOCK(); for (i = 0; i < MAX_THREADS && !thread_table[i].in_use || thread_table[i].id != thread_id; i++) {} if (i >= MAX_THREADS ) { WARN("thread %ld not found on detach", (GC_word)thread_id); } else { thread_table[i].stack = 0; thread_table[i].in_use = FALSE; CloseHandle(thread_table[i].handle); /* cast away volatile qualifier */ BZERO((void *)&thread_table[i].context, sizeof(CONTEXT)); } UNLOCK(); } #ifdef CYGWIN32 /* Called by GC_init() - we hold the allocation lock. */ void GC_thr_init() { if (GC_thr_initialized) return; GC_thr_initialized = TRUE; #if 0 /* this might already be handled in GC_init... */ InitializeCriticalSection(&GC_allocate_ml); #endif /* Add the initial thread, so we can stop it. */ threadAttach(); } struct start_info { void *(*start_routine)(void *); void *arg; }; int GC_pthread_join(pthread_t pthread_id, void **retval) { int result; int i; # if DEBUG_CYGWIN_THREADS GC_printf3("thread 0x%x(0x%x) is joining thread 0x%x.\n",(int)pthread_self(), GetCurrentThreadId(), (int)pthread_id); # endif /* Can't do any table lookups here, because thread being joined might not have registered itself yet */ result = pthread_join(pthread_id, retval); LOCK(); for (i = 0; !thread_table[i].in_use || thread_table[i].pthread_id != pthread_id; i++) { if (i == MAX_THREADS - 1) { GC_printf1("Failed to find thread 0x%x in pthread_join()\n", pthread_id); ABORT("thread not found on detach"); } } UNLOCK(); threadDetach(thread_table[i].id); # if DEBUG_CYGWIN_THREADS GC_printf3("thread 0x%x(0x%x) completed join with thread 0x%x.\n", (int)pthread_self(), GetCurrentThreadId(), (int)pthread_id); # endif return result; } /* Cygwin-pthreads calls CreateThread internally, but it's not * easily interceptible by us.. * so intercept pthread_create instead */ int GC_pthread_create(pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg) { int result; struct start_info * si; if (!GC_is_initialized) GC_init(); /* make sure GC is initialized (i.e. main thread is attached) */ /* This is otherwise saved only in an area mmapped by the thread */ /* library, which isn't visible to the collector. */ si = GC_malloc_uncollectable(sizeof(struct start_info)); if (0 == si) return(EAGAIN); si -> start_routine = start_routine; si -> arg = arg; # if DEBUG_CYGWIN_THREADS GC_printf2("About to create a thread from 0x%x(0x%x)\n",(int)pthread_self(), GetCurrentThreadId); # endif result = pthread_create(new_thread, attr, GC_start_routine, si); if (result) { /* failure */ GC_free(si); } return(result); } void * GC_start_routine(void * arg) { struct start_info * si = arg; void * result; void *(*start)(void *); void *start_arg; pthread_t pthread_id; int i; # if DEBUG_CYGWIN_THREADS GC_printf2("thread 0x%x(0x%x) starting...\n",(int)pthread_self(), GetCurrentThreadId()); # endif /* If a GC occurs before the thread is registered, that GC will */ /* ignore this thread. That's fine, since it will block trying to */ /* acquire the allocation lock, and won't yet hold interesting */ /* pointers. */ LOCK(); /* We register the thread here instead of in the parent, so that */ /* we don't need to hold the allocation lock during pthread_create. */ threadAttach(); UNLOCK(); start = si -> start_routine; start_arg = si -> arg; pthread_id = pthread_self(); GC_free(si); /* was allocated uncollectable */ pthread_cleanup_push(GC_thread_exit_proc, pthread_id); result = (*start)(start_arg); pthread_cleanup_pop(0); # if DEBUG_CYGWIN_THREADS GC_printf2("thread 0x%x(0x%x) returned from start routine.\n", (int)pthread_self(),GetCurrentThreadId()); # endif LOCK(); for (i = 0; thread_table[i].pthread_id != pthread_id; i++) { if (i == MAX_THREADS - 1) ABORT("thread not found on exit"); } thread_table[i].status = result; UNLOCK(); return(result); } void GC_thread_exit_proc(void *arg) { pthread_t pthread_id = (pthread_t)arg; int i; # if DEBUG_CYGWIN_THREADS GC_printf2("thread 0x%x(0x%x) called pthread_exit().\n",(int)pthread_self(),GetCurrentThreadId()); # endif LOCK(); for (i = 0; thread_table[i].pthread_id != pthread_id; i++) { if (i == MAX_THREADS - 1) ABORT("thread not found on exit"); } UNLOCK(); #if 0 /* TODO: we need a way to get the exit value after a pthread_exit so we can stash it safely away */ thread_table[i].status = ??? #endif } /* nothing required here... */ int GC_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset) { return pthread_sigmask(how, set, oset); } int GC_pthread_detach(pthread_t thread) { return pthread_detach(thread); } #else /* * We avoid acquiring locks here, since this doesn't seem to be preemptable. * Pontus Rydin suggests wrapping the thread start routine instead. */ BOOL WINAPI DllMain(HINSTANCE inst, ULONG reason, LPVOID reserved) { switch (reason) { case DLL_PROCESS_ATTACH: InitializeCriticalSection(&GC_allocate_ml); GC_init(); /* Force initialization before thread attach. */ /* fall through */ case DLL_THREAD_ATTACH: threadAttach(); break; case DLL_THREAD_DETACH: threadDetach(GetCurrentThreadId()); break; case DLL_PROCESS_DETACH: { int i; LOCK(); for (i = 0; i < MAX_THREADS; ++i) { if (thread_table[i].in_use) { thread_table[i].stack = 0; thread_table[i].in_use = FALSE; CloseHandle(thread_table[i].handle); BZERO((void *) &thread_table[i].context, sizeof(CONTEXT)); } } UNLOCK(); GC_deinit(); DeleteCriticalSection(&GC_allocate_ml); } break; } return TRUE; } #endif /* CYGWIN32 */ # endif /* !MSWINCE */ #endif /* GC_WIN32_THREADS */