diff options
Diffstat (limited to 'gcc/objc/thr-win32.c')
| -rw-r--r-- | gcc/objc/thr-win32.c | 383 |
1 files changed, 159 insertions, 224 deletions
diff --git a/gcc/objc/thr-win32.c b/gcc/objc/thr-win32.c index 520a91d..159e3e3 100644 --- a/gcc/objc/thr-win32.c +++ b/gcc/objc/thr-win32.c @@ -32,306 +32,241 @@ Boston, MA 02111-1307, USA. */ #endif #include <windows.h> -/******** - * This structure represents a single mutual exclusion lock. Lock semantics - * are detailed with the subsequent functions. We use whatever lock is - * provided by the system. We augment it with depth and current owner id - * fields to implement and re-entrant lock. - */ -struct objc_mutex -{ - volatile objc_thread_t owner; /* Id of thread that owns. */ - volatile int depth; /* # of acquires. */ - HANDLE handle; /* Win32 mutex HANDLE. */ -}; - -/***************************************************************************** - * Static variables. - */ -static DWORD __objc_data_tls = (DWORD)-1; /* Win32 Thread Local Index.*/ - -/******** - * Initialize the threads subsystem. Returns 0 if successful, or -1 if no - * thread support is available. - */ +/* Key structure for maintiain thread specific storage */ +static DWORD __objc_data_tls = (DWORD)-1; + +/* Backend initialization functions */ + +/* Initialize the threads subsystem. */ int __objc_init_thread_system(void) { - DEBUG_PRINTF("__objc_init_thread_system\n"); - + /* Initialize the thread storage key */ if ((__objc_data_tls = TlsAlloc()) != (DWORD)-1) - return 0; /* Yes, return success. */ - - return -1; /* Failed. */ + return 0; + else + return -1; } +/* Close the threads subsystem. */ int -__objc_fini_thread_system(void) +__objc_close_thread_system(void) { - if (__objc_data_tls != (DWORD)-1) { + if (__objc_data_tls != (DWORD)-1) TlsFree(__objc_data_tls); - return 0; - } - return -1; + return 0; } -/******** - * Create a new thread of execution and return its id. Return NULL if fails. - * The new thread starts in "func" with the given argument. - */ +/* Backend thread functions */ + +/* Create a new thread of execution. */ objc_thread_t -objc_thread_create(void (*func)(void *arg), void *arg) +__objc_thread_detach(void (*func)(void *arg), void *arg) { - DWORD thread_id = 0; /* Detached thread id. */ - HANDLE win32_handle; /* Win32 thread handle. */ + DWORD thread_id = 0; + HANDLE win32_handle; - objc_mutex_lock(__objc_runtime_mutex); - - if ((win32_handle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)func, - arg, 0, &thread_id))) { - __objc_runtime_threads_alive++; - } - else - thread_id = 0; - - objc_mutex_unlock(__objc_runtime_mutex); + 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. - */ +/* Set the current thread's priority. */ int -objc_thread_set_priority(int priority) +__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; - } + 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; /* Changed priority. End. */ - - return -1; /* Failed. */ + return 0; + else + return -1; } -/******** - * Return the current thread's priority. - */ +/* Return the current thread's priority. */ int -objc_thread_get_priority(void) +__objc_thread_get_priority(void) { - int sys_priority; + 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; + 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; - } - return -1; /* Couldn't get 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. Any BUSY waiting that is done - * by a thread should use this function to make sure that other threads can - * make progress even on a lazy uniprocessor system. - */ +/* Yield our process time to another thread. */ void -objc_thread_yield(void) +__objc_thread_yield(void) { - Sleep(0); /* Yield to equal thread. */ + Sleep(0); } -/******** - * Terminate the current tread. Doesn't return anything. Doesn't return. - * Actually, if it failed returns -1. - */ +/* Terminate the current thread. */ int -objc_thread_exit(void) +__objc_thread_exit(void) { - objc_mutex_lock(__objc_runtime_mutex); - __objc_runtime_threads_alive--; - objc_mutex_unlock(__objc_runtime_mutex); - - ExitThread(__objc_thread_exit_status); /* Terminate thread. */ + /* exit the thread */ + ExitThread(__objc_thread_exit_status); + + /* Failed if we reached here */ return -1; } -/******** - * Returns an integer value which uniquely describes a thread. Must not be - * -1 which is reserved as a marker for "no thread". - */ +/* Returns an integer value which uniquely describes a thread. */ objc_thread_t -objc_thread_id(void) +__objc_thread_id(void) { - return (objc_thread_t)GetCurrentThreadId(); /* Return thread id. */ + return (objc_thread_t)GetCurrentThreadId(); } -/******** - * Sets the thread's local storage pointer. Returns 0 if successful or -1 - * if failed. - */ +/* Sets the thread's local storage pointer. */ int -objc_thread_set_data(void *value) +__objc_thread_set_data(void *value) { if (TlsSetValue(__objc_data_tls, value)) - return 0; /* Return thread data. */ - return -1; + return 0; + else + return -1; } -/******** - * Returns the thread's local storage pointer. Returns NULL on failure. - */ +/* Returns the thread's local storage pointer. */ void * -objc_thread_get_data(void) +__objc_thread_get_data(void) { return TlsGetValue(__objc_data_tls); /* Return thread data. */ } -/******** - * Allocate a mutex. Return the mutex pointer if successful or NULL if - * the allocation fails for any reason. - */ -objc_mutex_t -objc_mutex_allocate(void) +/* Backend mutex functions */ + +/* Allocate a mutex. */ +int +__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 +__objc_mutex_deallocate(objc_mutex_t mutex) { - objc_mutex_t mutex; - int err = 0; + CloseHandle((HANDLE)(mutex->backend)); + return 0; +} - if (!(mutex = (objc_mutex_t)objc_malloc(sizeof(struct objc_mutex)))) - return NULL; /* Abort if malloc failed. */ +/* Grab a lock on a mutex. */ +int +__objc_mutex_lock(objc_mutex_t mutex) +{ + int status; - if ((mutex->handle = CreateMutex(NULL, 0, NULL)) == NULL) { - objc_free(mutex); /* Failed, free memory. */ - return NULL; /* Abort. */ - } - mutex->owner = NULL; /* No owner. */ - mutex->depth = 0; /* No locks. */ - return mutex; /* Return mutex handle. */ + status = WaitForSingleObject((HANDLE)(mutex->backend), INFINITE); + if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED) + return -1; + else + return 0; } -/******** - * Deallocate a mutex. Note that this includes an implicit mutex_lock to - * insure that no one else is using the lock. It is legal to deallocate - * a lock if we have a lock on it, but illegal to deallotcate a lock held - * by anyone else. - * Returns the number of locks on the thread. (1 for deallocate). - */ +/* Try to grab a lock on a mutex. */ int -objc_mutex_deallocate(objc_mutex_t mutex) +__objc_mutex_trylock(objc_mutex_t mutex) { - int depth; /* # of locks on mutex. */ + int status; - if (!mutex) /* Is argument bad? */ - return -1; /* Yes, abort. */ - depth = objc_mutex_lock(mutex); /* Must have lock. */ + status = WaitForSingleObject((HANDLE)(mutex->backend), 0); + if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED) + return -1; + else + return 0; +} - CloseHandle(mutex->handle); /* Close Win32 handle. */ - - objc_free(mutex); /* Free memory. */ - return depth; /* Return last depth. */ +/* Unlock the mutex */ +int +__objc_mutex_unlock(objc_mutex_t mutex) +{ + if (ReleaseMutex((HANDLE)(mutex->backend)) == 0) + return -1; + else + return 0; } -/******** - * Grab a lock on a mutex. If this thread already has a lock on this mutex - * then we increment the lock count. If another thread has a lock on the - * mutex we block and wait for the thread to release the lock. - * Returns the lock count on the mutex held by this thread. - */ +/* Backend condition mutex functions */ + +/* Allocate a condition. */ int -objc_mutex_lock(objc_mutex_t mutex) +__objc_condition_allocate(objc_condition_t condition) { - objc_thread_t thread_id; /* Cache our thread id. */ - int status; - - if (!mutex) /* Is argument bad? */ - return -1; /* Yes, abort. */ - thread_id = objc_thread_id(); /* Get this thread's id. */ - if (mutex->owner == thread_id) /* Already own lock? */ - return ++mutex->depth; /* Yes, increment depth. */ - - status = WaitForSingleObject(mutex->handle, INFINITE); - if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED) - return -1; /* Failed, abort. */ - - mutex->owner = thread_id; /* Mark thread as owner. */ + /* Unimplemented. */ + return -1; +} - return ++mutex->depth; /* Increment depth to end. */ +/* Deallocate a condition. */ +int +__objc_condition_deallocate(objc_condition_t condition) +{ + /* Unimplemented. */ + return -1; } -/******** - * Try to grab a lock on a mutex. If this thread already has a lock on - * this mutex then we increment the lock count and return it. If another - * thread has a lock on the mutex returns -1. - */ +/* Wait on the condition */ int -objc_mutex_trylock(objc_mutex_t mutex) +__objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex) { - objc_thread_t thread_id; /* Cache our thread id. */ - DWORD status; /* Return status from Win32.*/ - - if (!mutex) /* Is argument bad? */ - return -1; /* Yes, abort. */ - thread_id = objc_thread_id(); /* Get this thread's id. */ - if (mutex->owner == thread_id) /* Already own lock? */ - return ++mutex->depth; /* Yes, increment depth. */ - - status = WaitForSingleObject(mutex->handle, 0); - if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED) - return -1; /* Failed, abort. */ - - mutex->owner = thread_id; /* Mark thread as owner. */ - return ++mutex->depth; /* Increment depth to end. */ + /* Unimplemented. */ + return -1; } -/******** - * Decrements the lock count on this mutex by one. If the lock count reaches - * zero, release the lock on the mutex. Returns the lock count on the mutex. - * It is an error to attempt to unlock a mutex which this thread doesn't hold - * in which case return -1 and the mutex is unaffected. - * Will also return -1 if the mutex free fails. - */ +/* Wake up all threads waiting on this condition. */ int -objc_mutex_unlock(objc_mutex_t mutex) +__objc_condition_broadcast(objc_condition_t condition) { - objc_thread_t thread_id; /* Cache our thread id. */ - - if (!mutex) /* Is argument bad? */ - return -1; /* Yes, abort. */ - thread_id = objc_thread_id(); /* Get this thread's id. */ - if (mutex->owner != thread_id) /* Does some else own lock? */ - return -1; /* Yes, abort. */ - if (mutex->depth > 1) /* Released last lock? */ - return --mutex->depth; /* No, Decrement depth, end.*/ - mutex->depth = 0; /* Yes, reset depth to 0. */ - mutex->owner = NULL; /* Set owner to "no thread".*/ - - if (ReleaseMutex(mutex->handle) == 0) - return -1; /* Failed, abort. */ - - return 0; /* No, return success. */ + /* Unimplemented. */ + return -1; +} + +/* Wake up one thread waiting on this condition. */ +int +__objc_condition_signal(objc_condition_t condition) +{ + /* Unimplemented. */ + return -1; } /* End of File */ |