| #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; |
| } |
| |
| #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 */ |