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Diffstat (limited to 'boehm-gc/win32_threads.c')
-rw-r--r--boehm-gc/win32_threads.c211
1 files changed, 0 insertions, 211 deletions
diff --git a/boehm-gc/win32_threads.c b/boehm-gc/win32_threads.c
deleted file mode 100644
index 469fd232003..00000000000
--- a/boehm-gc/win32_threads.c
+++ /dev/null
@@ -1,211 +0,0 @@
-#ifdef WIN32_THREADS
-
-#include "gc_priv.h"
-
-#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;
-};
-
-volatile GC_bool GC_please_stop = FALSE;
-
-volatile struct thread_entry thread_table[MAX_THREADS];
-
-void GC_stop_world()
-{
- DWORD thread_id = GetCurrentThreadId();
- int i;
-
- GC_please_stop = TRUE;
- for (i = 0; i < MAX_THREADS; i++)
- if (thread_table[i].stack != 0
- && thread_table[i].id != thread_id) {
- if (SuspendThread(thread_table[i].handle) == (DWORD)-1)
- ABORT("SuspendThread failed");
- 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;
-}
-
-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");
-}
-
-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);
-}
-
-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(&i, thread_table[i].stack);
- else {
- thread_table[i].context.ContextFlags
- = (CONTEXT_INTEGER|CONTEXT_CONTROL);
- if (!GetThreadContext(thread_table[i].handle,
- &thread_table[i].context))
- ABORT("GetThreadContext failed");
- if (thread_table[i].context.Esp >= (DWORD)thread_table[i].stack
- || thread_table[i].context.Esp < (DWORD)bottom)
- ABORT("Thread stack pointer out of range");
- 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.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);
- GC_push_all_stack(thread_table[i].context.Esp, thread_table[i].stack);
- }
- }
-}
-
-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;
-}
-
-LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info);
-
-/*
- * 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:
- {
- 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 */
-# ifndef SMALL_CONFIG
- if (GC_incremental) SetUnhandledExceptionFilter(GC_write_fault_handler);
-# endif
-
- for (i = 0; InterlockedExchange(&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();
- if (!DuplicateHandle(GetCurrentProcess(),
- GetCurrentThread(),
- GetCurrentProcess(),
- &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 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);
- }
- break;
- case DLL_PROCESS_DETACH:
- case DLL_THREAD_DETACH:
- {
- int i;
- DWORD thread_id = GetCurrentThreadId();
- LOCK();
- for (i = 0;
- thread_table[i].stack == 0 || thread_table[i].id != thread_id;
- i++) {
- if (i == MAX_THREADS - 1)
- ABORT("thread not found on detach");
- }
- thread_table[i].stack = 0;
- thread_table[i].in_use = FALSE;
- CloseHandle(thread_table[i].handle);
- BZERO(&thread_table[i].context, sizeof(CONTEXT));
- UNLOCK();
- }
- break;
- }
- return TRUE;
-}
-
-#endif /* WIN32_THREADS */
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