diff options
Diffstat (limited to 'gc/win32_threads.c')
| -rwxr-xr-x | gc/win32_threads.c | 859 |
1 files changed, 0 insertions, 859 deletions
diff --git a/gc/win32_threads.c b/gc/win32_threads.c deleted file mode 100755 index 1f9ab94..0000000 --- a/gc/win32_threads.c +++ /dev/null @@ -1,859 +0,0 @@ -#if defined(GC_WIN32_THREADS) - -#include "private/gc_priv.h" - -#ifdef CYGWIN32 -# include <errno.h> - - /* 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 <windows.h> -#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 - -/* - * This isn't generally safe, since DllMain is not premptible. - * If another thread holds the lock while this runs we're in trouble. - * 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 */ |