-/* Threads compatibility routines for libgcc2. */
+/* Threads compatibility routines for libgcc2 and libobjc. */
/* Compile this one with gcc. */
-/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+
+/* 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 GNU CC.
+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.
-GNU CC 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 2, 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.
-GNU CC 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
-along with GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+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/>. */
-/* As a special exception, if you link this library with other files,
- some of which are compiled with GCC, to produce an executable,
- this library does not by itself cause the resulting executable
- to be covered by the GNU General Public License.
- This exception does not however invalidate any other reasons why
- the executable file might be covered by the GNU General Public License. */
+#ifndef GCC_GTHR_WIN32_H
+#define GCC_GTHR_WIN32_H
-#ifndef __gthr_win32_h
-#define __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
+ 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
+ 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
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
+ 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
+ This may cause incorrect error return due to truncation values on
hw where sizeof (DWORD) > sizeof (int).
-
- 3. We might consider using Critical Sections instead of Windows32
- mutexes for better performance, but emulating __gthread_mutex_trylock
- interface becomes more complicated (Win9x does not support
- TryEnterCriticalSectioni, while NT does).
-
+
+ 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 <windows.h>
#include <errno.h>
#ifdef __MINGW32__
#include <_mingw.h>
#endif
-typedef DWORD __gthread_key_t;
+#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) 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) 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 condition)
+{
+ /* Unimplemented. */
+ return -1;
+}
+
+/* Deallocate a condition. */
+int
+__gthread_objc_condition_deallocate (objc_condition_t condition)
+{
+ /* Unimplemented. */
+ return -1;
+}
+
+/* Wait on the condition */
+int
+__gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
+{
+ /* Unimplemented. */
+ return -1;
+}
+
+/* Wake up all threads waiting on this condition. */
+int
+__gthread_objc_condition_broadcast (objc_condition_t condition)
+{
+ /* Unimplemented. */
+ return -1;
+}
+
+/* Wake up one thread waiting on this condition. */
+int
+__gthread_objc_condition_signal (objc_condition_t 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 HANDLE __gthread_mutex_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 {FALSE, -1}
+#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 __MINGW32_MAJOR_VERSION >= 1 || \
- (__MINGW32_MAJOR_VERSION == 0 && __MINGW32_MINOR_VERSION > 2)
+#if defined (_WIN32) && !defined(__CYGWIN__)
#define MINGW32_SUPPORTS_MT_EH 1
-extern int __mingwthr_key_dtor PARAMS ((DWORD, void (*) (void *)));
-/* Mingw runtime >= v0.3 provides a magic variable that is set to non-zero
- if -mthreads option was specified, or 0 otherwise. This is to get around
+/* 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;
-#endif
+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)
#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))
+__gthread_once (__gthread_once_t *__once, void (*__func) (void))
{
if (! __gthread_active_p ())
return -1;
- else if (once == NULL || func == NULL)
+ else if (__once == NULL || __func == NULL)
return EINVAL;
- if (! once->done)
+ if (! __once->done)
{
- if (InterlockedIncrement (&(once->started)) == 0)
- {
- (*func) ();
- once->done = TRUE;
+ 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)
+ /* 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
+ 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 *))
+__gthread_key_create (__gthread_key_t *__key,
+ void (*__dtor) (void *) __attribute__((unused)))
{
- int status = 0;
- DWORD tls_index = TlsAlloc ();
- if (tls_index != 0xFFFFFFFF)
+ int __status = 0;
+ DWORD __tls_index = TlsAlloc ();
+ if (__tls_index != 0xFFFFFFFF)
{
- *key = tls_index;
+ *__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);
+ __status = __mingwthr_key_dtor (*__key, __dtor);
#endif
}
else
- status = (int) GetLastError ();
- return status;
+ __status = (int) GetLastError ();
+ return __status;
}
-/* Currently, this routine is called only for Mingw runtime, and if
- -mthreads option is chosen to link in the thread support DLL. */
static inline int
-__gthread_key_dtor (__gthread_key_t key, void *ptr)
+__gthread_key_delete (__gthread_key_t __key)
{
- /* Nothing needed. */
- return 0;
+ return (TlsFree (__key) != 0) ? 0 : (int) GetLastError ();
}
-static inline int
-__gthread_key_delete (__gthread_key_t key)
+static inline void *
+__gthread_getspecific (__gthread_key_t __key)
{
- return (TlsFree (key) != 0) ? 0 : (int) GetLastError ();
+ DWORD __lasterror;
+ void *__ptr;
+
+ __lasterror = GetLastError ();
+
+ __ptr = TlsGetValue (__key);
+
+ SetLastError (__lasterror);
+
+ return __ptr;
}
-static inline void *
-__gthread_getspecific (__gthread_key_t key)
+static inline int
+__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
{
- return TlsGetValue (key);
+ if (TlsSetValue (__key, CONST_CAST2(void *, const void *, __ptr)) != 0)
+ return 0;
+ else
+ return GetLastError ();
}
-static inline int
-__gthread_setspecific (__gthread_key_t key, const void *ptr)
+static inline void
+__gthread_mutex_init_function (__gthread_mutex_t *__mutex)
{
- return (TlsSetValue (key, (void*) ptr) != 0) ? 0 : (int) GetLastError ();
+ __mutex->counter = -1;
+ __mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL);
}
static inline void
-__gthread_mutex_init_function (__gthread_mutex_t *mutex)
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
{
- /* Create unnamed mutex with default security attr and no initial owner. */
- *mutex = CreateMutex (NULL, 0, NULL);
+ CloseHandle ((HANDLE) __mutex->sema);
}
static inline int
-__gthread_mutex_lock (__gthread_mutex_t *mutex)
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
{
- int status = 0;
+ int __status = 0;
if (__gthread_active_p ())
{
- if (WaitForSingleObject (*mutex, INFINITE) == WAIT_OBJECT_0)
- status = 0;
+ if (InterlockedIncrement (&__mutex->counter) == 0 ||
+ WaitForSingleObject (__mutex->sema, INFINITE) == WAIT_OBJECT_0)
+ __status = 0;
else
- status = 1;
+ {
+ /* WaitForSingleObject returns WAIT_FAILED, and we can only do
+ some best-effort cleanup here. */
+ InterlockedDecrement (&__mutex->counter);
+ __status = 1;
+ }
}
- return status;
+ return __status;
}
static inline int
-__gthread_mutex_trylock (__gthread_mutex_t *mutex)
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
{
- int status = 0;
+ int __status = 0;
if (__gthread_active_p ())
{
- if (WaitForSingleObject (*mutex, 0) == WAIT_OBJECT_0)
- status = 0;
+ if (__GTHR_W32_InterlockedCompareExchange (&__mutex->counter, 0, -1) < 0)
+ __status = 0;
else
- status = 1;
+ __status = 1;
}
- return status;
+ return __status;
}
static inline int
-__gthread_mutex_unlock (__gthread_mutex_t *mutex)
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
{
if (__gthread_active_p ())
- return (ReleaseMutex (*mutex) != 0) ? 0 : 1;
- else
- return 0;
+ {
+ if (InterlockedDecrement (&__mutex->counter) >= 0)
+ return ReleaseSemaphore (__mutex->sema, 1, NULL) ? 0 : 1;
+ }
+ return 0;
}
-#endif /* not __gthr_win32_h */
+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 */
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