Annotation of OpenXM_contrib/gc/win32_threads.c, Revision 1.1
1.1 ! maekawa 1: #ifdef WIN32_THREADS
! 2:
! 3: #include "gc_priv.h"
! 4:
! 5: #define STRICT
! 6: #include <windows.h>
! 7:
! 8: #define MAX_THREADS 64
! 9:
! 10: struct thread_entry {
! 11: LONG in_use;
! 12: DWORD id;
! 13: HANDLE handle;
! 14: void *stack; /* The cold end of the stack. */
! 15: /* 0 ==> entry not valid. */
! 16: /* !in_use ==> stack == 0 */
! 17: CONTEXT context;
! 18: GC_bool suspended;
! 19: };
! 20:
! 21: volatile GC_bool GC_please_stop = FALSE;
! 22:
! 23: volatile struct thread_entry thread_table[MAX_THREADS];
! 24:
! 25: void GC_stop_world()
! 26: {
! 27: DWORD thread_id = GetCurrentThreadId();
! 28: int i;
! 29:
! 30: GC_please_stop = TRUE;
! 31: for (i = 0; i < MAX_THREADS; i++)
! 32: if (thread_table[i].stack != 0
! 33: && thread_table[i].id != thread_id) {
! 34: if (SuspendThread(thread_table[i].handle) == (DWORD)-1)
! 35: ABORT("SuspendThread failed");
! 36: thread_table[i].suspended = TRUE;
! 37: }
! 38: }
! 39:
! 40: void GC_start_world()
! 41: {
! 42: DWORD thread_id = GetCurrentThreadId();
! 43: int i;
! 44: for (i = 0; i < MAX_THREADS; i++)
! 45: if (thread_table[i].stack != 0 && thread_table[i].suspended
! 46: && thread_table[i].id != thread_id) {
! 47: if (ResumeThread(thread_table[i].handle) == (DWORD)-1)
! 48: ABORT("ResumeThread failed");
! 49: thread_table[i].suspended = FALSE;
! 50: }
! 51: GC_please_stop = FALSE;
! 52: }
! 53:
! 54: ptr_t GC_current_stackbottom()
! 55: {
! 56: DWORD thread_id = GetCurrentThreadId();
! 57: int i;
! 58: for (i = 0; i < MAX_THREADS; i++)
! 59: if (thread_table[i].stack && thread_table[i].id == thread_id)
! 60: return thread_table[i].stack;
! 61: ABORT("no thread table entry for current thread");
! 62: }
! 63:
! 64: ptr_t GC_get_lo_stack_addr(ptr_t s)
! 65: {
! 66: ptr_t bottom;
! 67: MEMORY_BASIC_INFORMATION info;
! 68: VirtualQuery(s, &info, sizeof(info));
! 69: do {
! 70: bottom = info.BaseAddress;
! 71: VirtualQuery(bottom - 1, &info, sizeof(info));
! 72: } while ((info.Protect & PAGE_READWRITE) && !(info.Protect & PAGE_GUARD));
! 73: return(bottom);
! 74: }
! 75:
! 76: void GC_push_all_stacks()
! 77: {
! 78: DWORD thread_id = GetCurrentThreadId();
! 79: int i;
! 80: for (i = 0; i < MAX_THREADS; i++)
! 81: if (thread_table[i].stack) {
! 82: ptr_t bottom = GC_get_lo_stack_addr(thread_table[i].stack);
! 83: if (thread_table[i].id == thread_id)
! 84: GC_push_all(&i, thread_table[i].stack);
! 85: else {
! 86: thread_table[i].context.ContextFlags
! 87: = (CONTEXT_INTEGER|CONTEXT_CONTROL);
! 88: if (!GetThreadContext(thread_table[i].handle,
! 89: &thread_table[i].context))
! 90: ABORT("GetThreadContext failed");
! 91: if (thread_table[i].context.Esp >= (DWORD)thread_table[i].stack
! 92: || thread_table[i].context.Esp < (DWORD)bottom)
! 93: ABORT("Thread stack pointer out of range");
! 94: GC_push_one ((word) thread_table[i].context.Edi);
! 95: GC_push_one ((word) thread_table[i].context.Esi);
! 96: GC_push_one ((word) thread_table[i].context.Ebx);
! 97: GC_push_one ((word) thread_table[i].context.Edx);
! 98: GC_push_one ((word) thread_table[i].context.Ecx);
! 99: GC_push_one ((word) thread_table[i].context.Eax);
! 100: GC_push_all_stack(thread_table[i].context.Esp, thread_table[i].stack);
! 101: }
! 102: }
! 103: }
! 104:
! 105: void GC_get_next_stack(char *start, char **lo, char **hi)
! 106: {
! 107: int i;
! 108: # define ADDR_LIMIT (char *)(-1L)
! 109: char * current_min = ADDR_LIMIT;
! 110:
! 111: for (i = 0; i < MAX_THREADS; i++) {
! 112: char * s = (char *)thread_table[i].stack;
! 113:
! 114: if (0 != s && s > start && s < current_min) {
! 115: current_min = s;
! 116: }
! 117: }
! 118: *hi = current_min;
! 119: if (current_min == ADDR_LIMIT) {
! 120: *lo = ADDR_LIMIT;
! 121: return;
! 122: }
! 123: *lo = GC_get_lo_stack_addr(current_min);
! 124: if (*lo < start) *lo = start;
! 125: }
! 126:
! 127: LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info);
! 128:
! 129: /*
! 130: * This isn't generally safe, since DllMain is not premptible.
! 131: * If another thread holds the lock while this runs we're in trouble.
! 132: * Pontus Rydin suggests wrapping the thread start routine instead.
! 133: */
! 134: BOOL WINAPI DllMain(HINSTANCE inst, ULONG reason, LPVOID reserved)
! 135: {
! 136: switch (reason) {
! 137: case DLL_PROCESS_ATTACH:
! 138: InitializeCriticalSection(&GC_allocate_ml);
! 139: GC_init(); /* Force initialization before thread attach. */
! 140: /* fall through */
! 141: case DLL_THREAD_ATTACH:
! 142: {
! 143: int i;
! 144: /* It appears to be unsafe to acquire a lock here, since this */
! 145: /* code is apparently not preeemptible on some systems. */
! 146: /* (This is based on complaints, not on Microsoft's official */
! 147: /* documentation, which says this should perform "only simple */
! 148: /* inititalization tasks".) */
! 149: /* Hence we make do with nonblocking synchronization. */
! 150:
! 151: /* The following should be a noop according to the win32 */
! 152: /* documentation. There is empirical evidence that it */
! 153: /* isn't. - HB */
! 154: # ifndef SMALL_CONFIG
! 155: if (GC_incremental) SetUnhandledExceptionFilter(GC_write_fault_handler);
! 156: # endif
! 157:
! 158: for (i = 0; InterlockedExchange(&thread_table[i].in_use,1) != 0; i++) {
! 159: /* Compare-and-swap would make this cleaner, but that's not */
! 160: /* supported before Windows 98 and NT 4.0. In Windows 2000, */
! 161: /* InterlockedExchange is supposed to be replaced by */
! 162: /* InterlockedExchangePointer, but that's not really what I */
! 163: /* want here. */
! 164: if (i == MAX_THREADS - 1)
! 165: ABORT("too many threads");
! 166: }
! 167: thread_table[i].id = GetCurrentThreadId();
! 168: if (!DuplicateHandle(GetCurrentProcess(),
! 169: GetCurrentThread(),
! 170: GetCurrentProcess(),
! 171: &thread_table[i].handle,
! 172: 0,
! 173: 0,
! 174: DUPLICATE_SAME_ACCESS)) {
! 175: DWORD last_error = GetLastError();
! 176: GC_printf1("Last error code: %lx\n", last_error);
! 177: ABORT("DuplicateHandle failed");
! 178: }
! 179: thread_table[i].stack = GC_get_stack_base();
! 180: /* If this thread is being created while we are trying to stop */
! 181: /* the world, wait here. Hopefully this can't happen on any */
! 182: /* systems that don't allow us to block here. */
! 183: while (GC_please_stop) Sleep(20);
! 184: }
! 185: break;
! 186: case DLL_PROCESS_DETACH:
! 187: case DLL_THREAD_DETACH:
! 188: {
! 189: int i;
! 190: DWORD thread_id = GetCurrentThreadId();
! 191: LOCK();
! 192: for (i = 0;
! 193: thread_table[i].stack == 0 || thread_table[i].id != thread_id;
! 194: i++) {
! 195: if (i == MAX_THREADS - 1)
! 196: ABORT("thread not found on detach");
! 197: }
! 198: thread_table[i].stack = 0;
! 199: thread_table[i].in_use = FALSE;
! 200: CloseHandle(thread_table[i].handle);
! 201: BZERO(&thread_table[i].context, sizeof(CONTEXT));
! 202: UNLOCK();
! 203: }
! 204: break;
! 205: }
! 206: return TRUE;
! 207: }
! 208:
! 209: #endif /* WIN32_THREADS */
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