diff options
Diffstat (limited to 'boehm-gc/win32_threads.c')
| -rw-r--r-- | boehm-gc/win32_threads.c | 811 |
1 files changed, 811 insertions, 0 deletions
diff --git a/boehm-gc/win32_threads.c b/boehm-gc/win32_threads.c new file mode 100644 index 000000000..ffb34e0a8 --- /dev/null +++ b/boehm-gc/win32_threads.c @@ -0,0 +1,811 @@ +#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(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() +{ + extern GC_PTR _tlsbase __asm__ ("%fs:4"); + return _tlsbase; +} + +#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 */ |