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[Emacs-diffs] Changes to emacs/gc/win32_threads.c [Boehm-versions]
|
From: |
Dave Love |
|
Subject: |
[Emacs-diffs] Changes to emacs/gc/win32_threads.c [Boehm-versions] |
|
Date: |
Mon, 16 Jun 2003 11:20:09 -0400 |
Index: emacs/gc/win32_threads.c
diff -c /dev/null emacs/gc/win32_threads.c:1.2.2.1.2.1
*** /dev/null Mon Jun 16 11:20:09 2003
--- emacs/gc/win32_threads.c Mon Jun 16 11:19:52 2003
***************
*** 0 ****
--- 1,869 ----
+ #if defined(GC_WIN32_THREADS)
+
+ #include "private/gc_priv.h"
+ #include <windows.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
+
+ #ifndef MAX_THREADS
+ # define MAX_THREADS 64
+ #endif
+
+ 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(CYGWIN32)
+
+ #if !defined(MSWINCE) && defined(GC_DLL)
+
+ /* We register threads from DllMain */
+
+ GC_API HANDLE 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 {
+ 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)) */
+
+ #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 */
+ 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.
+ */
+ static 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);
+ }
+
+ static 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 /* !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:
+ 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 /* GC_DLL */
+ #endif /* !CYGWIN32 */
+
+ # endif /* !MSWINCE */
+
+ #endif /* GC_WIN32_THREADS */
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