diff options
Diffstat (limited to 'gcc/objc/thr-os2.c')
| -rw-r--r-- | gcc/objc/thr-os2.c | 306 |
1 files changed, 116 insertions, 190 deletions
diff --git a/gcc/objc/thr-os2.c b/gcc/objc/thr-os2.c index 422d53e..d546060 100644 --- a/gcc/objc/thr-os2.c +++ b/gcc/objc/thr-os2.c @@ -44,71 +44,39 @@ Boston, MA 02111-1307, USA. */ #include <stdlib.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. */ - HMTX handle; /* OS/2 mutex HANDLE. */ -}; +/* Backend initialization functions */ -/***************************************************************************** - * Static variables. - */ -/* none needed for OS/2 */ - -/******** - * Initialize the threads subsystem. Returns 0 if successful, or -1 if no - * thread support is available. - */ +/* Initialize the threads subsystem. */ int __objc_init_thread_system(void) { - DEBUG_PRINTF("__objc_init_thread_system (os2-emx)\n"); - - /* no initialization of thread subsystem */ - return 0; /* Yes, return success. */ + return 0; } +/* Close the threads subsystem. */ int -__objc_fini_thread_system(void) +__objc_close_thread_system(void) { - /* no termination code for thread subsystem */ 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) { - int thread_id = 0; /* id of the newly created thread */ + int thread_id = 0; - objc_mutex_lock(__objc_runtime_mutex); - - /* create a thread calling "func", args "arg", stack size 32768 bytes */ if ((thread_id = _beginthread (func,NULL,32768,arg)) < 0) thread_id = 0; - else - __objc_runtime_threads_alive++; - - objc_mutex_unlock(__objc_runtime_mutex); 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) { ULONG sys_class = 0; ULONG sys_priority = 0; @@ -132,210 +100,168 @@ objc_thread_set_priority(int priority) sys_priority = 0; break; } + + /* Change priority */ if (!DosSetPriority (PRTYS_THREAD,sys_class,sys_priority,*_threadid)) - 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) { PTIB ptib; PPIB ppib; - DosGetInfoBlocks (&ptib,&ppib); /* get information about current thread */ + /* get information about current thread */ + DosGetInfoBlocks (&ptib,&ppib); + + switch (ptib->tib_ptib2->tib2_ulpri) + { + case PRTYC_IDLETIME: + case PRTYC_REGULAR: + case PRTYC_TIMECRITICAL: + case PRTYC_FOREGROUNDSERVER: + default: + return OBJC_THREAD_INTERACTIVE_PRIORITY; + } - switch (ptib->tib_ptib2->tib2_ulpri) { - case PRTYC_IDLETIME: - case PRTYC_REGULAR: - case PRTYC_TIMECRITICAL: - case PRTYC_FOREGROUNDSERVER: - default: - return OBJC_THREAD_INTERACTIVE_PRIORITY; - } - return -1; /* 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) { - DosSleep (0); /* Yield to equal thread. */ + DosSleep (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); - - _endthread (); /* terminate the thread, NEVER use DosExit () */ + /* terminate the thread, NEVER use DosExit () */ + _endthread (); + /* 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) *_threadid; /* Return thread id. */ + return (objc_thread_t) *_threadid; } -/******** - * 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) { *_threadstore () = value; return 0; } -/******** - * 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 *_threadstore (); } -/******** - * 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) -{ - objc_mutex_t mutex; - int err = 0; - - if (!(mutex = (objc_mutex_t)objc_malloc(sizeof(struct objc_mutex)))) - return NULL; /* Abort if malloc failed. */ - - if (DosCreateMutexSem (NULL,&(mutex->handle),0L,0) > 0) { - objc_free(mutex); - return NULL; - } +/* Backend mutex functions */ - mutex->owner = NULL; /* No owner. */ - mutex->depth = 0; /* No locks. */ - return mutex; /* Return mutex handle. */ +/* Allocate a mutex. */ +int +__objc_mutex_allocate(objc_mutex_t mutex) +{ + if (DosCreateMutexSem (NULL, (HMTX)(&(mutex->backend)),0L,0) > 0) + 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). - */ +/* Deallocate a mutex. */ int -objc_mutex_deallocate(objc_mutex_t mutex) +__objc_mutex_deallocate(objc_mutex_t mutex) { - int depth; /* # of locks on mutex. */ - - if (!mutex) /* Is argument bad? */ - return -1; /* Yes, abort. */ - depth = objc_mutex_lock(mutex); /* Must have lock. */ - - DosCloseMutexSem (mutex->handle); - - objc_free(mutex); /* Free memory. */ - return depth; /* Return last depth. */ + DosCloseMutexSem ((HMTX)(mutex->backend)); + 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. - */ +/* Grab a lock on a mutex. */ int -objc_mutex_lock(objc_mutex_t mutex) +__objc_mutex_lock(objc_mutex_t mutex) { - objc_thread_t thread_id; /* Cache our thread id. */ - - if (!mutex) /* Is argument bad? */ - return -1; /* Yes, abort. */ + if (DosRequestMutexSem ((HMTX)(mutex->backend),-1L) != 0) + return -1; + else + return 0; +} - thread_id = objc_thread_id(); /* Get this thread's id. */ - if (mutex->owner == thread_id) /* Already own lock? */ - return ++mutex->depth; /* Yes, increment depth. */ +/* Try to grab a lock on a mutex. */ +int +__objc_mutex_trylock(objc_mutex_t mutex) +{ + if (DosRequestMutexSem ((HMTX)(mutex->backend),0L) != 0) + return -1; + else + return 0; +} - if (DosRequestMutexSem (mutex->handle,-1L) != 0) - return -1; +/* Unlock the mutex */ +int +__objc_mutex_unlock(objc_mutex_t mutex) +{ + if (DosReleaseMutexSem((HMTX)(mutex->backend)) != 0) + return -1; + else + return 0; +} - mutex->owner = thread_id; /* Mark thread as owner. */ +/* Backend condition mutex functions */ - return ++mutex->depth; /* Increment depth to end. */ +/* Allocate a condition. */ +int +__objc_condition_allocate(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. - */ +/* Deallocate a condition. */ int -objc_mutex_trylock(objc_mutex_t mutex) +__objc_condition_deallocate(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) /* Already own lock? */ - return ++mutex->depth; /* Yes, increment depth. */ + /* Unimplemented. */ + return -1; +} - if (DosRequestMutexSem (mutex->handle,0L) != 0) - return -1; +/* Wait on the condition */ +int +__objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex) +{ + /* Unimplemented. */ + return -1; +} - mutex->owner = thread_id; /* Mark thread as owner. */ - return ++mutex->depth; /* Increment depth to end. */ +/* Wake up all threads waiting on this condition. */ +int +__objc_condition_broadcast(objc_condition_t condition) +{ + /* 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 one thread waiting on this condition. */ int -objc_mutex_unlock(objc_mutex_t mutex) +__objc_condition_signal(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 (DosReleaseMutexSem(mutex->handle) != 0) - return -1; /* Failed, abort. */ - - return 0; /* No, return success. */ + /* Unimplemented. */ + return -1; } + +/* End of File */ |