/* Threads compatibility routines for libgcc2 and libobjc. */
/* Compile this one with gcc. */
-/* Copyright (C) 1999, 2000, 2002 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 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 2, or (at your option) any later
+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
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
-You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+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.
-/* 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. */
+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.
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. */
#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 it's own BOOL as a typedef. */
+ defining its own BOOL as a typedef. */
#ifndef __OBJC__
#define __OBJC__
#endif
int
__gthread_objc_init_thread_system (void)
{
- /* Initialize the thread storage key */
+ /* Initialize the thread storage key. */
if ((__gthread_objc_data_tls = TlsAlloc ()) != (DWORD) -1)
return 0;
else
arg, 0, &thread_id)))
thread_id = 0;
- return (objc_thread_t) thread_id;
+ return (objc_thread_t) (INT_PTR) thread_id;
}
/* Set the current thread's priority. */
objc_thread_t
__gthread_objc_thread_id (void)
{
- return (objc_thread_t) GetCurrentThreadId ();
+ return (objc_thread_t) (INT_PTR) GetCurrentThreadId ();
}
/* Sets the thread's local storage pointer. */
/* Allocate a condition. */
int
-__gthread_objc_condition_allocate (objc_condition_t condition)
+__gthread_objc_condition_allocate (objc_condition_t __UNUSED_PARAM(condition))
{
/* Unimplemented. */
return -1;
/* Deallocate a condition. */
int
-__gthread_objc_condition_deallocate (objc_condition_t condition)
+__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 condition, objc_mutex_t mutex)
+__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 condition)
+__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 condition)
+__gthread_objc_condition_signal (objc_condition_t __UNUSED_PARAM(condition))
{
/* Unimplemented. */
return -1;
long started;
} __gthread_once_t;
-typedef void* __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 {0, -1}
#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
-#define __GTHREAD_MUTEX_INIT_DEFAULT 0
+#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
/* 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 /* __MINGW32__ version */
+#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
}
-#ifdef __GTHREAD_HIDE_WIN32API
+#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
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))
+__gthread_once (__gthread_once_t *__once, void (*__func) (void))
{
if (__gthread_active_p ())
- return __gthr_win32_once (once, func);
+ return __gthr_win32_once (__once, __func);
else
return -1;
}
static inline int
-__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
+__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
{
- return __gthr_win32_key_create (key, dtor);
+ return __gthr_win32_key_create (__key, __dtor);
}
static inline int
-__gthread_key_delete (__gthread_key_t key)
+__gthread_key_delete (__gthread_key_t __key)
{
- return __gthr_win32_key_delete (key);
+ return __gthr_win32_key_delete (__key);
}
static inline void *
-__gthread_getspecific (__gthread_key_t key)
+__gthread_getspecific (__gthread_key_t __key)
{
- return __gthr_win32_getspecific (key);
+ return __gthr_win32_getspecific (__key);
}
static inline int
-__gthread_setspecific (__gthread_key_t key, const void *ptr)
+__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)
{
- return __gthr_win32_setspecific (key, ptr);
+ __gthr_win32_mutex_init_function (__mutex);
}
static inline void
-__gthread_mutex_init_function (__gthread_mutex_t *mutex)
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
{
- __gthr_win32_mutex_init_function (mutex);
+ __gthr_win32_mutex_destroy (__mutex);
}
static inline int
-__gthread_mutex_lock (__gthread_mutex_t *mutex)
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
{
if (__gthread_active_p ())
- return __gthr_win32_mutex_lock (mutex);
+ return __gthr_win32_mutex_lock (__mutex);
else
return 0;
}
static inline int
-__gthread_mutex_trylock (__gthread_mutex_t *mutex)
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
{
if (__gthread_active_p ())
- return __gthr_win32_mutex_trylock (mutex);
+ return __gthr_win32_mutex_trylock (__mutex);
else
return 0;
}
static inline int
-__gthread_mutex_unlock (__gthread_mutex_t *mutex)
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
{
if (__gthread_active_p ())
- return __gthr_win32_mutex_unlock (mutex);
+ 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;
}
#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)
+ if (InterlockedIncrement (&(__once->started)) == 0)
{
- (*func) ();
- once->done = TRUE;
+ (*__func) ();
+ __once->done = TRUE;
}
else
{
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)
+ while (! __once->done)
Sleep (0);
}
}
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;
}
static inline int
-__gthread_key_delete (__gthread_key_t key)
+__gthread_key_delete (__gthread_key_t __key)
{
- return (TlsFree (key) != 0) ? 0 : (int) GetLastError ();
+ return (TlsFree (__key) != 0) ? 0 : (int) GetLastError ();
}
static inline void *
-__gthread_getspecific (__gthread_key_t key)
+__gthread_getspecific (__gthread_key_t __key)
{
- DWORD lasterror;
- void *ptr;
+ DWORD __lasterror;
+ void *__ptr;
- lasterror = GetLastError ();
+ __lasterror = GetLastError ();
- ptr = TlsGetValue (key);
+ __ptr = TlsGetValue (__key);
- SetLastError (lasterror);
+ SetLastError (__lasterror);
- return ptr;
+ return __ptr;
}
static inline int
-__gthread_setspecific (__gthread_key_t key, const void *ptr)
+__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)
{
- 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)
+{
+ CloseHandle ((HANDLE) __mutex->sema);
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
{
- /* Create unnamed mutex with default security attr and no initial owner. */
- *mutex = CreateMutex (NULL, 0, NULL);
+ 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_lock (__gthread_mutex_t *mutex)
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
{
- int status = 0;
+ int __status = 0;
if (__gthread_active_p ())
{
- if (WaitForSingleObject (*mutex, INFINITE) == 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_trylock (__gthread_mutex_t *mutex)
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
{
- int status = 0;
+ 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 ())
{
- if (WaitForSingleObject (*mutex, 0) == WAIT_OBJECT_0)
- status = 0;
+ 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
- status = 1;
+ {
+ /* WaitForSingleObject returns WAIT_FAILED, and we can only do
+ some best-effort cleanup here. */
+ InterlockedDecrement (&__mutex->counter);
+ return 1;
+ }
}
- return status;
+ return 0;
}
static inline int
-__gthread_mutex_unlock (__gthread_mutex_t *mutex)
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
{
if (__gthread_active_p ())
- return (ReleaseMutex (*mutex) != 0) ? 0 : 1;
- else
- return 0;
+ {
+ 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 */
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