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Diffstat (limited to 'gcc/gthr-win32.h')
| -rw-r--r-- | gcc/gthr-win32.h | 772 |
1 files changed, 0 insertions, 772 deletions
diff --git a/gcc/gthr-win32.h b/gcc/gthr-win32.h deleted file mode 100644 index 53f8396cc81..00000000000 --- a/gcc/gthr-win32.h +++ /dev/null @@ -1,772 +0,0 @@ -/* Threads compatibility routines for libgcc2 and libobjc. */ -/* Compile this one with gcc. */ - -/* Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005, 2008, 2009 - Free Software Foundation, Inc. - Contributed by Mumit Khan <khan@xraylith.wisc.edu>. - -This file is part of GCC. - -GCC is free software; you can redistribute it and/or modify it under -the terms of the GNU General Public License as published by the Free -Software Foundation; either version 3, or (at your option) any later -version. - -GCC is distributed in the hope that it will be useful, but WITHOUT ANY -WARRANTY; without even the implied warranty of MERCHANTABILITY or -FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -for more details. - -Under Section 7 of GPL version 3, you are granted additional -permissions described in the GCC Runtime Library Exception, version -3.1, as published by the Free Software Foundation. - -You should have received a copy of the GNU General Public License and -a copy of the GCC Runtime Library Exception along with this program; -see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -<http://www.gnu.org/licenses/>. */ - -#ifndef GCC_GTHR_WIN32_H -#define GCC_GTHR_WIN32_H - -/* Make sure CONST_CAST2 (origin in system.h) is declared. */ -#ifndef CONST_CAST2 -#define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq) -#endif - -/* Windows32 threads specific definitions. The windows32 threading model - does not map well into pthread-inspired gcc's threading model, and so - there are caveats one needs to be aware of. - - 1. The destructor supplied to __gthread_key_create is ignored for - generic x86-win32 ports. This will certainly cause memory leaks - due to unreclaimed eh contexts (sizeof (eh_context) is at least - 24 bytes for x86 currently). - - This memory leak may be significant for long-running applications - that make heavy use of C++ EH. - - However, Mingw runtime (version 0.3 or newer) provides a mechanism - to emulate pthreads key dtors; the runtime provides a special DLL, - linked in if -mthreads option is specified, that runs the dtors in - the reverse order of registration when each thread exits. If - -mthreads option is not given, a stub is linked in instead of the - DLL, which results in memory leak. Other x86-win32 ports can use - the same technique of course to avoid the leak. - - 2. The error codes returned are non-POSIX like, and cast into ints. - This may cause incorrect error return due to truncation values on - hw where sizeof (DWORD) > sizeof (int). - - 3. We are currently using a special mutex instead of the Critical - Sections, since Win9x does not support TryEnterCriticalSection - (while NT does). - - The basic framework should work well enough. In the long term, GCC - needs to use Structured Exception Handling on Windows32. */ - -#define __GTHREADS 1 - -#include <errno.h> -#ifdef __MINGW32__ -#include <_mingw.h> -#endif - -#ifndef __UNUSED_PARAM -#define __UNUSED_PARAM(x) x -#endif - -#ifdef _LIBOBJC - -/* This is necessary to prevent windef.h (included from windows.h) from - defining its own BOOL as a typedef. */ -#ifndef __OBJC__ -#define __OBJC__ -#endif -#include <windows.h> -/* Now undef the windows BOOL. */ -#undef BOOL - -/* Key structure for maintaining thread specific storage */ -static DWORD __gthread_objc_data_tls = (DWORD) -1; - -/* Backend initialization functions */ - -/* Initialize the threads subsystem. */ -int -__gthread_objc_init_thread_system (void) -{ - /* Initialize the thread storage key. */ - if ((__gthread_objc_data_tls = TlsAlloc ()) != (DWORD) -1) - return 0; - else - return -1; -} - -/* Close the threads subsystem. */ -int -__gthread_objc_close_thread_system (void) -{ - if (__gthread_objc_data_tls != (DWORD) -1) - TlsFree (__gthread_objc_data_tls); - return 0; -} - -/* Backend thread functions */ - -/* Create a new thread of execution. */ -objc_thread_t -__gthread_objc_thread_detach (void (*func)(void *arg), void *arg) -{ - DWORD thread_id = 0; - HANDLE win32_handle; - - if (!(win32_handle = CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) func, - arg, 0, &thread_id))) - thread_id = 0; - - return (objc_thread_t) (INT_PTR) thread_id; -} - -/* Set the current thread's priority. */ -int -__gthread_objc_thread_set_priority (int priority) -{ - int sys_priority = 0; - - switch (priority) - { - case OBJC_THREAD_INTERACTIVE_PRIORITY: - sys_priority = THREAD_PRIORITY_NORMAL; - break; - default: - case OBJC_THREAD_BACKGROUND_PRIORITY: - sys_priority = THREAD_PRIORITY_BELOW_NORMAL; - break; - case OBJC_THREAD_LOW_PRIORITY: - sys_priority = THREAD_PRIORITY_LOWEST; - break; - } - - /* Change priority */ - if (SetThreadPriority (GetCurrentThread (), sys_priority)) - return 0; - else - return -1; -} - -/* Return the current thread's priority. */ -int -__gthread_objc_thread_get_priority (void) -{ - int sys_priority; - - sys_priority = GetThreadPriority (GetCurrentThread ()); - - switch (sys_priority) - { - case THREAD_PRIORITY_HIGHEST: - case THREAD_PRIORITY_TIME_CRITICAL: - case THREAD_PRIORITY_ABOVE_NORMAL: - case THREAD_PRIORITY_NORMAL: - return OBJC_THREAD_INTERACTIVE_PRIORITY; - - default: - case THREAD_PRIORITY_BELOW_NORMAL: - return OBJC_THREAD_BACKGROUND_PRIORITY; - - case THREAD_PRIORITY_IDLE: - case THREAD_PRIORITY_LOWEST: - return OBJC_THREAD_LOW_PRIORITY; - } - - /* Couldn't get priority. */ - return -1; -} - -/* Yield our process time to another thread. */ -void -__gthread_objc_thread_yield (void) -{ - Sleep (0); -} - -/* Terminate the current thread. */ -int -__gthread_objc_thread_exit (void) -{ - /* exit the thread */ - ExitThread (__objc_thread_exit_status); - - /* Failed if we reached here */ - return -1; -} - -/* Returns an integer value which uniquely describes a thread. */ -objc_thread_t -__gthread_objc_thread_id (void) -{ - return (objc_thread_t) (INT_PTR) GetCurrentThreadId (); -} - -/* Sets the thread's local storage pointer. */ -int -__gthread_objc_thread_set_data (void *value) -{ - if (TlsSetValue (__gthread_objc_data_tls, value)) - return 0; - else - return -1; -} - -/* Returns the thread's local storage pointer. */ -void * -__gthread_objc_thread_get_data (void) -{ - DWORD lasterror; - void *ptr; - - lasterror = GetLastError (); - - ptr = TlsGetValue (__gthread_objc_data_tls); /* Return thread data. */ - - SetLastError (lasterror); - - return ptr; -} - -/* Backend mutex functions */ - -/* Allocate a mutex. */ -int -__gthread_objc_mutex_allocate (objc_mutex_t mutex) -{ - if ((mutex->backend = (void *) CreateMutex (NULL, 0, NULL)) == NULL) - return -1; - else - return 0; -} - -/* Deallocate a mutex. */ -int -__gthread_objc_mutex_deallocate (objc_mutex_t mutex) -{ - CloseHandle ((HANDLE) (mutex->backend)); - return 0; -} - -/* Grab a lock on a mutex. */ -int -__gthread_objc_mutex_lock (objc_mutex_t mutex) -{ - int status; - - status = WaitForSingleObject ((HANDLE) (mutex->backend), INFINITE); - if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED) - return -1; - else - return 0; -} - -/* Try to grab a lock on a mutex. */ -int -__gthread_objc_mutex_trylock (objc_mutex_t mutex) -{ - int status; - - status = WaitForSingleObject ((HANDLE) (mutex->backend), 0); - if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED) - return -1; - else - return 0; -} - -/* Unlock the mutex */ -int -__gthread_objc_mutex_unlock (objc_mutex_t mutex) -{ - if (ReleaseMutex ((HANDLE) (mutex->backend)) == 0) - return -1; - else - return 0; -} - -/* Backend condition mutex functions */ - -/* Allocate a condition. */ -int -__gthread_objc_condition_allocate (objc_condition_t __UNUSED_PARAM(condition)) -{ - /* Unimplemented. */ - return -1; -} - -/* Deallocate a condition. */ -int -__gthread_objc_condition_deallocate (objc_condition_t __UNUSED_PARAM(condition)) -{ - /* Unimplemented. */ - return -1; -} - -/* Wait on the condition */ -int -__gthread_objc_condition_wait (objc_condition_t __UNUSED_PARAM(condition), - objc_mutex_t __UNUSED_PARAM(mutex)) -{ - /* Unimplemented. */ - return -1; -} - -/* Wake up all threads waiting on this condition. */ -int -__gthread_objc_condition_broadcast (objc_condition_t __UNUSED_PARAM(condition)) -{ - /* Unimplemented. */ - return -1; -} - -/* Wake up one thread waiting on this condition. */ -int -__gthread_objc_condition_signal (objc_condition_t __UNUSED_PARAM(condition)) -{ - /* Unimplemented. */ - return -1; -} - -#else /* _LIBOBJC */ - -#ifdef __cplusplus -extern "C" { -#endif - -typedef unsigned long __gthread_key_t; - -typedef struct { - int done; - long started; -} __gthread_once_t; - -typedef struct { - long counter; - void *sema; -} __gthread_mutex_t; - -typedef struct { - long counter; - long depth; - unsigned long owner; - void *sema; -} __gthread_recursive_mutex_t; - -#define __GTHREAD_ONCE_INIT {0, -1} -#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function -#define __GTHREAD_MUTEX_INIT_DEFAULT {-1, 0} -#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION \ - __gthread_recursive_mutex_init_function -#define __GTHREAD_RECURSIVE_MUTEX_INIT_DEFAULT {-1, 0, 0, 0} - -#if defined (_WIN32) && !defined(__CYGWIN__) -#define MINGW32_SUPPORTS_MT_EH 1 -/* Mingw runtime >= v0.3 provides a magic variable that is set to nonzero - if -mthreads option was specified, or 0 otherwise. This is to get around - the lack of weak symbols in PE-COFF. */ -extern int _CRT_MT; -extern int __mingwthr_key_dtor (unsigned long, void (*) (void *)); -#endif /* _WIN32 && !__CYGWIN__ */ - -/* The Windows95 kernel does not export InterlockedCompareExchange. - This provides a substitute. When building apps that reference - gthread_mutex_try_lock, the __GTHREAD_I486_INLINE_LOCK_PRIMITIVES - macro must be defined if Windows95 is a target. Currently - gthread_mutex_try_lock is not referenced by libgcc or libstdc++. */ -#ifdef __GTHREAD_I486_INLINE_LOCK_PRIMITIVES -static inline long -__gthr_i486_lock_cmp_xchg(long *__dest, long __xchg, long __comperand) -{ - long result; - __asm__ __volatile__ ("\n\ - lock\n\ - cmpxchg{l} {%4, %1|%1, %4}\n" - : "=a" (result), "=m" (*__dest) - : "0" (__comperand), "m" (*__dest), "r" (__xchg) - : "cc"); - return result; -} -#define __GTHR_W32_InterlockedCompareExchange __gthr_i486_lock_cmp_xchg -#else /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */ -#define __GTHR_W32_InterlockedCompareExchange InterlockedCompareExchange -#endif /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */ - -static inline int -__gthread_active_p (void) -{ -#ifdef MINGW32_SUPPORTS_MT_EH - return _CRT_MT; -#else - return 1; -#endif -} - -#if __GTHREAD_HIDE_WIN32API - -/* The implementations are in config/i386/gthr-win32.c in libgcc.a. - Only stubs are exposed to avoid polluting the C++ namespace with - windows api definitions. */ - -extern int __gthr_win32_once (__gthread_once_t *, void (*) (void)); -extern int __gthr_win32_key_create (__gthread_key_t *, void (*) (void*)); -extern int __gthr_win32_key_delete (__gthread_key_t); -extern void * __gthr_win32_getspecific (__gthread_key_t); -extern int __gthr_win32_setspecific (__gthread_key_t, const void *); -extern void __gthr_win32_mutex_init_function (__gthread_mutex_t *); -extern int __gthr_win32_mutex_lock (__gthread_mutex_t *); -extern int __gthr_win32_mutex_trylock (__gthread_mutex_t *); -extern int __gthr_win32_mutex_unlock (__gthread_mutex_t *); -extern void - __gthr_win32_recursive_mutex_init_function (__gthread_recursive_mutex_t *); -extern int __gthr_win32_recursive_mutex_lock (__gthread_recursive_mutex_t *); -extern int - __gthr_win32_recursive_mutex_trylock (__gthread_recursive_mutex_t *); -extern int __gthr_win32_recursive_mutex_unlock (__gthread_recursive_mutex_t *); -extern void __gthr_win32_mutex_destroy (__gthread_mutex_t *); - -static inline int -__gthread_once (__gthread_once_t *__once, void (*__func) (void)) -{ - if (__gthread_active_p ()) - return __gthr_win32_once (__once, __func); - else - return -1; -} - -static inline int -__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *)) -{ - return __gthr_win32_key_create (__key, __dtor); -} - -static inline int -__gthread_key_delete (__gthread_key_t __key) -{ - return __gthr_win32_key_delete (__key); -} - -static inline void * -__gthread_getspecific (__gthread_key_t __key) -{ - return __gthr_win32_getspecific (__key); -} - -static inline int -__gthread_setspecific (__gthread_key_t __key, const void *__ptr) -{ - return __gthr_win32_setspecific (__key, __ptr); -} - -static inline void -__gthread_mutex_init_function (__gthread_mutex_t *__mutex) -{ - __gthr_win32_mutex_init_function (__mutex); -} - -static inline void -__gthread_mutex_destroy (__gthread_mutex_t *__mutex) -{ - __gthr_win32_mutex_destroy (__mutex); -} - -static inline int -__gthread_mutex_lock (__gthread_mutex_t *__mutex) -{ - if (__gthread_active_p ()) - return __gthr_win32_mutex_lock (__mutex); - else - return 0; -} - -static inline int -__gthread_mutex_trylock (__gthread_mutex_t *__mutex) -{ - if (__gthread_active_p ()) - return __gthr_win32_mutex_trylock (__mutex); - else - return 0; -} - -static inline int -__gthread_mutex_unlock (__gthread_mutex_t *__mutex) -{ - if (__gthread_active_p ()) - return __gthr_win32_mutex_unlock (__mutex); - else - return 0; -} - -static inline void -__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex) -{ - __gthr_win32_recursive_mutex_init_function (__mutex); -} - -static inline int -__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex) -{ - if (__gthread_active_p ()) - return __gthr_win32_recursive_mutex_lock (__mutex); - else - return 0; -} - -static inline int -__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex) -{ - if (__gthread_active_p ()) - return __gthr_win32_recursive_mutex_trylock (__mutex); - else - return 0; -} - -static inline int -__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex) -{ - if (__gthread_active_p ()) - return __gthr_win32_recursive_mutex_unlock (__mutex); - else - return 0; -} - -#else /* ! __GTHREAD_HIDE_WIN32API */ - -#include <windows.h> -#include <errno.h> - -static inline int -__gthread_once (__gthread_once_t *__once, void (*__func) (void)) -{ - if (! __gthread_active_p ()) - return -1; - else if (__once == NULL || __func == NULL) - return EINVAL; - - if (! __once->done) - { - if (InterlockedIncrement (&(__once->started)) == 0) - { - (*__func) (); - __once->done = TRUE; - } - else - { - /* Another thread is currently executing the code, so wait for it - to finish; yield the CPU in the meantime. If performance - does become an issue, the solution is to use an Event that - we wait on here (and set above), but that implies a place to - create the event before this routine is called. */ - while (! __once->done) - Sleep (0); - } - } - - return 0; -} - -/* Windows32 thread local keys don't support destructors; this leads to - leaks, especially in threaded applications making extensive use of - C++ EH. Mingw uses a thread-support DLL to work-around this problem. */ -static inline int -__gthread_key_create (__gthread_key_t *__key, - void (*__dtor) (void *) __attribute__((unused))) -{ - int __status = 0; - DWORD __tls_index = TlsAlloc (); - if (__tls_index != 0xFFFFFFFF) - { - *__key = __tls_index; -#ifdef MINGW32_SUPPORTS_MT_EH - /* Mingw runtime will run the dtors in reverse order for each thread - when the thread exits. */ - __status = __mingwthr_key_dtor (*__key, __dtor); -#endif - } - else - __status = (int) GetLastError (); - return __status; -} - -static inline int -__gthread_key_delete (__gthread_key_t __key) -{ - return (TlsFree (__key) != 0) ? 0 : (int) GetLastError (); -} - -static inline void * -__gthread_getspecific (__gthread_key_t __key) -{ - DWORD __lasterror; - void *__ptr; - - __lasterror = GetLastError (); - - __ptr = TlsGetValue (__key); - - SetLastError (__lasterror); - - return __ptr; -} - -static inline int -__gthread_setspecific (__gthread_key_t __key, const void *__ptr) -{ - if (TlsSetValue (__key, CONST_CAST2(void *, const void *, __ptr)) != 0) - return 0; - else - return GetLastError (); -} - -static inline void -__gthread_mutex_init_function (__gthread_mutex_t *__mutex) -{ - __mutex->counter = -1; - __mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL); -} - -static inline void -__gthread_mutex_destroy (__gthread_mutex_t *__mutex) -{ - CloseHandle ((HANDLE) __mutex->sema); -} - -static inline int -__gthread_mutex_lock (__gthread_mutex_t *__mutex) -{ - int __status = 0; - - if (__gthread_active_p ()) - { - if (InterlockedIncrement (&__mutex->counter) == 0 || - WaitForSingleObject (__mutex->sema, INFINITE) == WAIT_OBJECT_0) - __status = 0; - else - { - /* WaitForSingleObject returns WAIT_FAILED, and we can only do - some best-effort cleanup here. */ - InterlockedDecrement (&__mutex->counter); - __status = 1; - } - } - return __status; -} - -static inline int -__gthread_mutex_trylock (__gthread_mutex_t *__mutex) -{ - int __status = 0; - - if (__gthread_active_p ()) - { - if (__GTHR_W32_InterlockedCompareExchange (&__mutex->counter, 0, -1) < 0) - __status = 0; - else - __status = 1; - } - return __status; -} - -static inline int -__gthread_mutex_unlock (__gthread_mutex_t *__mutex) -{ - if (__gthread_active_p ()) - { - if (InterlockedDecrement (&__mutex->counter) >= 0) - return ReleaseSemaphore (__mutex->sema, 1, NULL) ? 0 : 1; - } - return 0; -} - -static inline void -__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex) -{ - __mutex->counter = -1; - __mutex->depth = 0; - __mutex->owner = 0; - __mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL); -} - -static inline int -__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex) -{ - if (__gthread_active_p ()) - { - DWORD __me = GetCurrentThreadId(); - if (InterlockedIncrement (&__mutex->counter) == 0) - { - __mutex->depth = 1; - __mutex->owner = __me; - } - else if (__mutex->owner == __me) - { - InterlockedDecrement (&__mutex->counter); - ++(__mutex->depth); - } - else if (WaitForSingleObject (__mutex->sema, INFINITE) == WAIT_OBJECT_0) - { - __mutex->depth = 1; - __mutex->owner = __me; - } - else - { - /* WaitForSingleObject returns WAIT_FAILED, and we can only do - some best-effort cleanup here. */ - InterlockedDecrement (&__mutex->counter); - return 1; - } - } - return 0; -} - -static inline int -__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex) -{ - if (__gthread_active_p ()) - { - DWORD __me = GetCurrentThreadId(); - if (__GTHR_W32_InterlockedCompareExchange (&__mutex->counter, 0, -1) < 0) - { - __mutex->depth = 1; - __mutex->owner = __me; - } - else if (__mutex->owner == __me) - ++(__mutex->depth); - else - return 1; - } - return 0; -} - -static inline int -__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex) -{ - if (__gthread_active_p ()) - { - --(__mutex->depth); - if (__mutex->depth == 0) - { - __mutex->owner = 0; - - if (InterlockedDecrement (&__mutex->counter) >= 0) - return ReleaseSemaphore (__mutex->sema, 1, NULL) ? 0 : 1; - } - } - return 0; -} - -#endif /* __GTHREAD_HIDE_WIN32API */ - -#ifdef __cplusplus -} -#endif - -#endif /* _LIBOBJC */ - -#endif /* ! GCC_GTHR_WIN32_H */ |