diff options
Diffstat (limited to 'boehm-gc/win32_threads.c')
| -rw-r--r-- | boehm-gc/win32_threads.c | 819 |
1 files changed, 0 insertions, 819 deletions
diff --git a/boehm-gc/win32_threads.c b/boehm-gc/win32_threads.c deleted file mode 100644 index 2de1c6953b8..00000000000 --- a/boehm-gc/win32_threads.c +++ /dev/null @@ -1,819 +0,0 @@ -#include "private/gc_priv.h" - -#if defined(GC_WIN32_THREADS) - -#include <windows.h> - -#ifdef CYGWIN32 -# include <errno.h> - - /* Cygwin-specific forward decls */ -# undef pthread_create -# undef pthread_sigmask -# undef pthread_join -# undef pthread_detach -# undef dlopen - -# define DEBUG_CYGWIN_THREADS 0 - - void * GC_start_routine(void * arg); - void GC_thread_exit_proc(void *arg); - -#endif - -/* The type of the first argument to InterlockedExchange. */ -/* Documented to be LONG volatile *, but at least gcc likes */ -/* this better. */ -typedef LONG * IE_t; - -#ifndef MAX_THREADS -# define MAX_THREADS 256 - /* FIXME: */ - /* Things may get quite slow for large numbers of threads, */ - /* since we look them up with sequential search. */ -#endif - -GC_bool GC_thr_initialized = FALSE; - -DWORD GC_main_thread = 0; - -struct GC_thread_Rep { - LONG in_use; /* Updated without lock. */ - /* We assert that unused */ - /* entries have invalid ids of */ - /* zero and zero stack fields. */ - DWORD id; - HANDLE handle; - ptr_t stack_base; /* The cold end of the stack. */ - /* 0 ==> entry not valid. */ - /* !in_use ==> stack_base == 0 */ - GC_bool suspended; - -# ifdef CYGWIN32 - void *status; /* hold exit value until join in case it's a pointer */ - pthread_t pthread_id; - short flags; /* Protected by GC lock. */ -# define FINISHED 1 /* Thread has exited. */ -# define DETACHED 2 /* Thread is intended to be detached. */ -# endif -}; - -typedef volatile struct GC_thread_Rep * GC_thread; - -/* - * We generally assume that volatile ==> memory ordering, at least among - * volatiles. - */ - -volatile GC_bool GC_please_stop = FALSE; - -volatile struct GC_thread_Rep thread_table[MAX_THREADS]; - -volatile LONG GC_max_thread_index = 0; /* Largest index in thread_table */ - /* that was ever used. */ - -extern LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info); - -/* - * This may be called from DllMain, and hence operates under unusual - * constraints. - */ -static GC_thread GC_new_thread(void) { - 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 */ - /* initialization 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((IE_t)&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"); - } - /* Update GC_max_thread_index if necessary. The following is safe, */ - /* and unlike CompareExchange-based solutions seems to work on all */ - /* Windows95 and later platforms. */ - /* Unfortunately, GC_max_thread_index may be temporarily out of */ - /* bounds, so readers have to compensate. */ - while (i > GC_max_thread_index) { - InterlockedIncrement((IE_t)&GC_max_thread_index); - } - if (GC_max_thread_index >= MAX_THREADS) { - /* We overshot due to simultaneous increments. */ - /* Setting it to MAX_THREADS-1 is always safe. */ - GC_max_thread_index = MAX_THREADS - 1; - } - -# 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_base = GC_get_stack_base(); - /* Up until this point, GC_push_all_stacks considers this thread */ - /* invalid. */ - if (thread_table[i].stack_base == NULL) - ABORT("Failed to find stack base in GC_new_thread"); - /* Up until this point, this entry is viewed as reserved but invalid */ - /* by GC_delete_thread. */ - thread_table[i].id = GetCurrentThreadId(); - /* 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); - return thread_table + i; -} - -/* - * GC_max_thread_index may temporarily be larger than MAX_THREADS. - * To avoid subscript errors, we check on access. - */ -#ifdef __GNUC__ -__inline__ -#endif -LONG GC_get_max_thread_index() -{ - LONG my_max = GC_max_thread_index; - - if (my_max >= MAX_THREADS) return MAX_THREADS-1; - return my_max; -} - -/* This is intended to be lock-free, though that */ -/* assumes that the CloseHandle becomes visible before the */ -/* in_use assignment. */ -static void GC_delete_gc_thread(GC_thread thr) -{ - CloseHandle(thr->handle); - /* cast away volatile qualifier */ - thr->stack_base = 0; - thr->id = 0; -# ifdef CYGWIN32 - thr->pthread_id = 0; -# endif /* CYGWIN32 */ - thr->in_use = FALSE; -} - -static void GC_delete_thread(DWORD thread_id) { - int i; - LONG my_max = GC_get_max_thread_index(); - - for (i = 0; - i <= my_max && - (!thread_table[i].in_use || thread_table[i].id != thread_id); - /* Must still be in_use, since nobody else can store our thread_id. */ - i++) {} - if (i > my_max) { - WARN("Removing nonexistent thread %ld\n", (GC_word)thread_id); - } else { - GC_delete_gc_thread(thread_table+i); - } -} - - -#ifdef CYGWIN32 - -/* Return a GC_thread corresponding to a given pthread_t. */ -/* Returns 0 if it's not there. */ -/* We assume that this is only called for pthread ids that */ -/* have not yet terminated or are still joinable. */ -static GC_thread GC_lookup_thread(pthread_t id) -{ - int i; - LONG my_max = GC_get_max_thread_index(); - - for (i = 0; - i <= my_max && - (!thread_table[i].in_use || thread_table[i].pthread_id != id - || !thread_table[i].in_use); - /* Must still be in_use, since nobody else can store our thread_id. */ - i++); - if (i > my_max) return 0; - return thread_table + i; -} - -#endif /* CYGWIN32 */ - -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 */ - LONG my_max = GC_get_max_thread_index(); - - for (i = 0; i <= my_max; i++) - if (thread_table[i].in_use) - GC_push_all((ptr_t)&(thread_table[i].status), - (ptr_t)(&(thread_table[i].status)+1)); - } -# endif -} - -/* Defined in misc.c */ -extern CRITICAL_SECTION GC_write_cs; - -void GC_stop_world() -{ - DWORD thread_id = GetCurrentThreadId(); - int i; - - if (!GC_thr_initialized) ABORT("GC_stop_world() called before GC_thr_init()"); - - GC_please_stop = TRUE; -# ifndef CYGWIN32 - EnterCriticalSection(&GC_write_cs); -# endif /* !CYGWIN32 */ - for (i = 0; i <= GC_get_max_thread_index(); i++) - if (thread_table[i].stack_base != 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_base = 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); -# endif - continue; - } - if (SuspendThread(thread_table[i].handle) == (DWORD)-1) - ABORT("SuspendThread failed"); -# endif - thread_table[i].suspended = TRUE; - } -# ifndef CYGWIN32 - LeaveCriticalSection(&GC_write_cs); -# endif /* !CYGWIN32 */ -} - -void GC_start_world() -{ - DWORD thread_id = GetCurrentThreadId(); - int i; - LONG my_max = GC_get_max_thread_index(); - - for (i = 0; i <= my_max; i++) - if (thread_table[i].stack_base != 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; - LONG my_max = GC_get_max_thread_index(); - - for (i = 0; i <= my_max; i++) - if (thread_table[i].stack_base && thread_table[i].id == thread_id) - return thread_table[i].stack_base; - 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_stack_min(s) \ - ((ptr_t)(((DWORD)(s) - 1) & 0xFFFF0000)) -# else - static ptr_t GC_get_stack_min(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(); - GC_bool found_me = FALSE; - int i; - int dummy; - ptr_t sp, stack_min; - GC_thread thread; - LONG my_max = GC_get_max_thread_index(); - - for (i = 0; i <= my_max; i++) { - thread = thread_table + i; - if (thread -> in_use && thread -> stack_base) { - if (thread -> id == thread_id) { - sp = (ptr_t) &dummy; - found_me = TRUE; - } else { - CONTEXT context; - context.ContextFlags = CONTEXT_INTEGER|CONTEXT_CONTROL; - if (!GetThreadContext(thread_table[i].handle, &context)) - ABORT("GetThreadContext failed"); - - /* Push all registers that might point into the heap. Frame */ - /* pointer registers are included in case client code was */ - /* compiled with the 'omit frame pointer' optimisation. */ -# define PUSH1(reg) GC_push_one((word)context.reg) -# define PUSH2(r1,r2) PUSH1(r1), PUSH1(r2) -# define PUSH4(r1,r2,r3,r4) PUSH2(r1,r2), PUSH2(r3,r4) -# if defined(__x86_64__) - PUSH4(Rdi,Rsi,Rbx,Rdx), PUSH2(Rcx,Rax), PUSH1(Rbp); - PUSH4(R8,R9,R10,R11), PUSH4(R12,R13,R14,R15); - sp = (ptr_t)context.Rsp; -# elif defined(I386) - PUSH4(Edi,Esi,Ebx,Edx), PUSH2(Ecx,Eax), PUSH1(Ebp); - sp = (ptr_t)context.Esp; -# elif defined(ARM32) - PUSH4(R0,R1,R2,R3),PUSH4(R4,R5,R6,R7),PUSH4(R8,R9,R10,R11),PUSH1(R12); - sp = (ptr_t)context.Sp; -# elif defined(SHx) - PUSH4(R0,R1,R2,R3), PUSH4(R4,R5,R6,R7), PUSH4(R8,R9,R10,R11); - PUSH2(R12,R13), PUSH1(R14); - sp = (ptr_t)context.R15; -# elif defined(MIPS) - PUSH4(IntAt,IntV0,IntV1,IntA0), PUSH4(IntA1,IntA2,IntA3,IntT0); - PUSH4(IntT1,IntT2,IntT3,IntT4), PUSH4(IntT5,IntT6,IntT7,IntS0); - PUSH4(IntS1,IntS2,IntS3,IntS4), PUSH4(IntS5,IntS6,IntS7,IntT8); - PUSH4(IntT9,IntK0,IntK1,IntS8); - sp = (ptr_t)context.IntSp; -# elif defined(PPC) - PUSH4(Gpr0, Gpr3, Gpr4, Gpr5), PUSH4(Gpr6, Gpr7, Gpr8, Gpr9); - PUSH4(Gpr10,Gpr11,Gpr12,Gpr14), PUSH4(Gpr15,Gpr16,Gpr17,Gpr18); - PUSH4(Gpr19,Gpr20,Gpr21,Gpr22), PUSH4(Gpr23,Gpr24,Gpr25,Gpr26); - PUSH4(Gpr27,Gpr28,Gpr29,Gpr30), PUSH1(Gpr31); - sp = (ptr_t)context.Gpr1; -# elif defined(ALPHA) - PUSH4(IntV0,IntT0,IntT1,IntT2), PUSH4(IntT3,IntT4,IntT5,IntT6); - PUSH4(IntT7,IntS0,IntS1,IntS2), PUSH4(IntS3,IntS4,IntS5,IntFp); - PUSH4(IntA0,IntA1,IntA2,IntA3), PUSH4(IntA4,IntA5,IntT8,IntT9); - PUSH4(IntT10,IntT11,IntT12,IntAt); - sp = (ptr_t)context.IntSp; -# else -# error "architecture is not supported" -# endif - } - - stack_min = GC_get_stack_min(thread->stack_base); - - if (sp >= stack_min && sp < thread->stack_base) - GC_push_all_stack(sp, thread->stack_base); - else { - WARN("Thread stack pointer 0x%lx out of range, pushing everything\n", - (unsigned long)sp); - GC_push_all_stack(stack_min, thread->stack_base); - } - } - } - if (!found_me) ABORT("Collecting from unknown thread."); -} - -void GC_get_next_stack(char *start, char **lo, char **hi) -{ - int i; -# define ADDR_LIMIT (char *)(-1L) - char * current_min = ADDR_LIMIT; - LONG my_max = GC_get_max_thread_index(); - - for (i = 0; i <= my_max; i++) { - char * s = (char *)thread_table[i].stack_base; - - 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_stack_min(current_min); - if (*lo < start) *lo = start; -} - -#if !defined(CYGWIN32) - -#if !defined(MSWINCE) && defined(GC_DLL) - -/* We register threads from DllMain */ - -GC_API 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(GC_DLL)) */ - -/* We have no DllMain to take care of new threads. Thus we */ -/* must properly intercept thread creation. */ - -typedef struct { - LPTHREAD_START_ROUTINE start; - LPVOID param; -} thread_args; - -static DWORD WINAPI thread_start(LPVOID arg); - -GC_API HANDLE WINAPI GC_CreateThread( - LPSECURITY_ATTRIBUTES lpThreadAttributes, - DWORD dwStackSize, LPTHREAD_START_ROUTINE lpStartAddress, - LPVOID lpParameter, DWORD dwCreationFlags, LPDWORD lpThreadId ) -{ - HANDLE thread_h = NULL; - - thread_args *args; - - if (!GC_is_initialized) GC_init(); - /* make sure GC is initialized (i.e. main thread is attached) */ - - args = GC_malloc_uncollectable(sizeof(thread_args)); - /* Handed off to and deallocated by child thread. */ - if (0 == args) { - SetLastError(ERROR_NOT_ENOUGH_MEMORY); - return NULL; - } - - /* set up thread arguments */ - args -> start = lpStartAddress; - args -> param = lpParameter; - - thread_h = CreateThread(lpThreadAttributes, - dwStackSize, thread_start, - args, dwCreationFlags, - lpThreadId); - - return thread_h; -} - -static DWORD WINAPI thread_start(LPVOID arg) -{ - DWORD ret = 0; - thread_args *args = (thread_args *)arg; - - GC_new_thread(); - - /* 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__ */ - GC_free(args); - GC_delete_thread(GetCurrentThreadId()); -#ifndef __GNUC__ - } -#endif /* __GNUC__ */ - - return ret; -} -#endif /* !defined(MSWINCE) && !(defined(__MINGW32__) && !defined(_DLL)) */ - -#endif /* !CYGWIN32 */ - -#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 */ - 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 */ - -/* Called by GC_init() - we hold the allocation lock. */ -void GC_thr_init() { - if (GC_thr_initialized) return; - GC_main_thread = GetCurrentThreadId(); - GC_thr_initialized = TRUE; - - /* Add the initial thread, so we can stop it. */ - GC_new_thread(); -} - -#ifdef CYGWIN32 - -struct start_info { - void *(*start_routine)(void *); - void *arg; - GC_bool detached; -}; - -int GC_pthread_join(pthread_t pthread_id, void **retval) { - int result; - int i; - GC_thread me; - -# 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 - - /* Thread being joined might not have registered itself yet. */ - /* After the join,thread id may have been recycled. */ - /* FIXME: It would be better if this worked more like */ - /* pthread_support.c. */ - - while ((me = GC_lookup_thread(pthread_id)) == 0) Sleep(10); - - result = pthread_join(pthread_id, retval); - - GC_delete_gc_thread(me); - -# 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 (attr != 0 && - pthread_attr_getdetachstate(attr, &si->detached) - == PTHREAD_CREATE_DETACHED) { - si->detached = TRUE; - } - -# 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; - GC_thread me; - GC_bool detached; - 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. */ - me = GC_new_thread(); - UNLOCK(); - - start = si -> start_routine; - start_arg = si -> arg; - if (si-> detached) me -> flags |= DETACHED; - me -> pthread_id = pthread_id = pthread_self(); - - GC_free(si); /* was allocated uncollectable */ - - pthread_cleanup_push(GC_thread_exit_proc, (void *)me); - result = (*start)(start_arg); - me -> status = result; - 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 - - return(result); -} - -void GC_thread_exit_proc(void *arg) -{ - GC_thread me = (GC_thread)arg; - int i; - -# if DEBUG_CYGWIN_THREADS - GC_printf2("thread 0x%x(0x%x) called pthread_exit().\n", - (int)pthread_self(),GetCurrentThreadId()); -# endif - - LOCK(); - if (me -> flags & DETACHED) { - GC_delete_thread(GetCurrentThreadId()); - } else { - /* deallocate it as part of join */ - me -> flags |= FINISHED; - } - UNLOCK(); -} - -/* 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) -{ - int result; - GC_thread thread_gc_id; - - LOCK(); - thread_gc_id = GC_lookup_thread(thread); - UNLOCK(); - result = pthread_detach(thread); - if (result == 0) { - LOCK(); - thread_gc_id -> flags |= DETACHED; - /* Here the pthread thread id may have been recycled. */ - if (thread_gc_id -> flags & FINISHED) { - GC_delete_gc_thread(thread_gc_id); - } - UNLOCK(); - } - return result; -} - -GC_PTR GC_get_thread_stack_base() -{ -#ifdef __x86_64__ - return ((NT_TIB*)NtCurrentTeb())->StackBase; -#else - extern GC_PTR _tlsbase __asm__ ("%fs:4"); - return _tlsbase; -#endif -} - -#else /* !CYGWIN32 */ - -/* - * We avoid acquiring locks here, since this doesn't seem to be preemptable. - * Pontus Rydin suggests wrapping the thread start routine instead. - */ -#ifdef GC_DLL -BOOL WINAPI DllMain(HINSTANCE inst, ULONG reason, LPVOID reserved) -{ - switch (reason) { - case DLL_PROCESS_ATTACH: - GC_init(); /* Force initialization before thread attach. */ - /* fall through */ - case DLL_THREAD_ATTACH: - GC_ASSERT(GC_thr_initialized); - if (GC_main_thread != GetCurrentThreadId()) { - GC_new_thread(); - } /* o.w. we already did it during GC_thr_init(), called by GC_init() */ - break; - - case DLL_THREAD_DETACH: - GC_delete_thread(GetCurrentThreadId()); - break; - - case DLL_PROCESS_DETACH: - { - int i; - - LOCK(); - for (i = 0; i <= GC_get_max_thread_index(); ++i) - { - if (thread_table[i].in_use) - GC_delete_gc_thread(thread_table + i); - } - UNLOCK(); - - GC_deinit(); - DeleteCriticalSection(&GC_allocate_ml); - } - break; - - } - return TRUE; -} -#endif /* GC_DLL */ -#endif /* !CYGWIN32 */ - -# endif /* !MSWINCE */ - -#endif /* GC_WIN32_THREADS */ |