/* 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 Free Software Foundation, Inc.
Contributed by Mumit Khan <khan@xraylith.wisc.edu>.
This file is part of GCC.
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. */
#undef BOOL
/* Key structure for maintaining thread specific storage */
-static DWORD __gthread_objc_data_tls = (DWORD)-1;
+static DWORD __gthread_objc_data_tls = (DWORD) -1;
/* Backend initialization functions */
/* Initialize the threads subsystem. */
int
-__gthread_objc_init_thread_system(void)
+__gthread_objc_init_thread_system (void)
{
- /* Initialize the thread storage key */
- if ((__gthread_objc_data_tls = TlsAlloc()) != (DWORD)-1)
+ /* 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)
+__gthread_objc_close_thread_system (void)
{
- if (__gthread_objc_data_tls != (DWORD)-1)
- TlsFree(__gthread_objc_data_tls);
+ if (__gthread_objc_data_tls != (DWORD) -1)
+ TlsFree (__gthread_objc_data_tls);
return 0;
}
/* Create a new thread of execution. */
objc_thread_t
-__gthread_objc_thread_detach(void (*func)(void *arg), void *arg)
+__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)))
+ if (!(win32_handle = CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) func,
+ arg, 0, &thread_id)))
thread_id = 0;
- return (objc_thread_t)thread_id;
+ return (objc_thread_t) thread_id;
}
/* Set the current thread's priority. */
int
-__gthread_objc_thread_set_priority(int priority)
+__gthread_objc_thread_set_priority (int priority)
{
int sys_priority = 0;
}
/* Change priority */
- if (SetThreadPriority(GetCurrentThread(), sys_priority))
+ if (SetThreadPriority (GetCurrentThread (), sys_priority))
return 0;
else
return -1;
/* Return the current thread's priority. */
int
-__gthread_objc_thread_get_priority(void)
+__gthread_objc_thread_get_priority (void)
{
int sys_priority;
- sys_priority = GetThreadPriority(GetCurrentThread());
+ sys_priority = GetThreadPriority (GetCurrentThread ());
switch (sys_priority)
{
/* Yield our process time to another thread. */
void
-__gthread_objc_thread_yield(void)
+__gthread_objc_thread_yield (void)
{
- Sleep(0);
+ Sleep (0);
}
/* Terminate the current thread. */
int
-__gthread_objc_thread_exit(void)
+__gthread_objc_thread_exit (void)
{
/* exit the thread */
- ExitThread(__objc_thread_exit_status);
+ 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)
+__gthread_objc_thread_id (void)
{
- return (objc_thread_t)GetCurrentThreadId();
+ return (objc_thread_t) GetCurrentThreadId ();
}
/* Sets the thread's local storage pointer. */
int
-__gthread_objc_thread_set_data(void *value)
+__gthread_objc_thread_set_data (void *value)
{
- if (TlsSetValue(__gthread_objc_data_tls, 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)
+__gthread_objc_thread_get_data (void)
{
DWORD lasterror;
void *ptr;
- lasterror = GetLastError();
+ lasterror = GetLastError ();
- ptr = TlsGetValue(__gthread_objc_data_tls); /* Return thread data. */
+ ptr = TlsGetValue (__gthread_objc_data_tls); /* Return thread data. */
- SetLastError( lasterror );
+ SetLastError (lasterror);
return ptr;
}
/* Allocate a mutex. */
int
-__gthread_objc_mutex_allocate(objc_mutex_t mutex)
+__gthread_objc_mutex_allocate (objc_mutex_t mutex)
{
- if ((mutex->backend = (void *)CreateMutex(NULL, 0, NULL)) == NULL)
+ 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)
+__gthread_objc_mutex_deallocate (objc_mutex_t mutex)
{
- CloseHandle((HANDLE)(mutex->backend));
+ CloseHandle ((HANDLE) (mutex->backend));
return 0;
}
/* Grab a lock on a mutex. */
int
-__gthread_objc_mutex_lock(objc_mutex_t mutex)
+__gthread_objc_mutex_lock (objc_mutex_t mutex)
{
int status;
- status = WaitForSingleObject((HANDLE)(mutex->backend), INFINITE);
+ status = WaitForSingleObject ((HANDLE) (mutex->backend), INFINITE);
if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
return -1;
else
/* Try to grab a lock on a mutex. */
int
-__gthread_objc_mutex_trylock(objc_mutex_t mutex)
+__gthread_objc_mutex_trylock (objc_mutex_t mutex)
{
int status;
- status = WaitForSingleObject((HANDLE)(mutex->backend), 0);
+ status = WaitForSingleObject ((HANDLE) (mutex->backend), 0);
if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
return -1;
else
/* Unlock the mutex */
int
-__gthread_objc_mutex_unlock(objc_mutex_t mutex)
+__gthread_objc_mutex_unlock (objc_mutex_t mutex)
{
- if (ReleaseMutex((HANDLE)(mutex->backend)) == 0)
+ if (ReleaseMutex ((HANDLE) (mutex->backend)) == 0)
return -1;
else
return 0;
/* Allocate a condition. */
int
-__gthread_objc_condition_allocate(objc_condition_t condition)
+__gthread_objc_condition_allocate (objc_condition_t condition)
{
/* Unimplemented. */
return -1;
/* Deallocate a condition. */
int
-__gthread_objc_condition_deallocate(objc_condition_t condition)
+__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)
+__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)
+__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)
+__gthread_objc_condition_signal (objc_condition_t 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)
extern int __mingwthr_key_dtor (unsigned long, void (*) (void *));
#endif /* __MINGW32__ version */
+/* 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 *);
static inline int
__gthread_once (__gthread_once_t *once, void (*func) (void))
{
- if ( __gthread_active_p ())
+ if (__gthread_active_p ())
return __gthr_win32_once (once, func);
else
- return -1;
+ return -1;
}
static inline int
}
static inline int
-__gthread_key_dtor (__gthread_key_t key, void *ptr)
-{
- /* Nothing needed. */
- return 0;
-}
-
- static inline int
__gthread_key_delete (__gthread_key_t key)
{
- return __gthr_win32_key_delete (key);
+ return __gthr_win32_key_delete (key);
}
static inline void *
if (__gthread_active_p ())
return __gthr_win32_mutex_trylock (mutex);
else
- return 0;
+ return 0;
}
static inline int
if (__gthread_active_p ())
return __gthr_win32_mutex_unlock (mutex);
else
- return 0;
+ 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 */
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)
-{
- /* Nothing needed. */
- return 0;
-}
-
static inline int
__gthread_key_delete (__gthread_key_t key)
{
DWORD lasterror;
void *ptr;
- lasterror = GetLastError();
+ lasterror = GetLastError ();
- ptr = TlsGetValue(key);
+ ptr = TlsGetValue (key);
- SetLastError( lasterror );
+ SetLastError (lasterror);
return ptr;
}
static inline void
__gthread_mutex_init_function (__gthread_mutex_t *mutex)
{
- /* Create unnamed mutex with default security attr and no initial owner. */
- *mutex = CreateMutex (NULL, 0, NULL);
+ mutex->counter = -1;
+ mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL);
}
static inline int
if (__gthread_active_p ())
{
- if (WaitForSingleObject (*mutex, INFINITE) == WAIT_OBJECT_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;
}
if (__gthread_active_p ())
{
- if (WaitForSingleObject (*mutex, 0) == WAIT_OBJECT_0)
+ if (__GTHR_W32_InterlockedCompareExchange (&mutex->counter, 0, -1) < 0)
status = 0;
else
status = 1;
__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;
+}
+
+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 */