From 98dca75bf3c7cd6692349b6a9e4f66430d90e779 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Tue, 2 Nov 1999 18:25:26 +0000 Subject: Split condition variables into multiple files. --- cpukit/posix/src/cond.c | 482 ------------------------------------------------ 1 file changed, 482 deletions(-) (limited to 'cpukit/posix/src/cond.c') diff --git a/cpukit/posix/src/cond.c b/cpukit/posix/src/cond.c index 0cb06ec192..32a1fea3f5 100644 --- a/cpukit/posix/src/cond.c +++ b/cpukit/posix/src/cond.c @@ -13,44 +13,6 @@ #include #include -/* - * TEMPORARY - */ - - -#if defined(RTEMS_MULTIPROCESSING) -void _POSIX_Condition_variables_MP_Send_process_packet ( - POSIX_Condition_variables_MP_Remote_operations operation, - Objects_Id condition_variables_id, - Objects_Name name, - Objects_Id proxy_id -) -{ - (void) POSIX_MP_NOT_IMPLEMENTED(); -} - -void _POSIX_Condition_variables_MP_Send_extract_proxy( - Thread_Control *the_thread -) -{ - (void) POSIX_MP_NOT_IMPLEMENTED(); -} -#endif - -/* - * END OF TEMPORARY - */ - -/*PAGE - * - * The default condition variable attributes structure. - */ - -const pthread_condattr_t _POSIX_Condition_variables_Default_attributes = { - TRUE, /* is_initialized */ - PTHREAD_PROCESS_PRIVATE /* process_shared */ -}; - /*PAGE * * _POSIX_Condition_variables_Manager_initialization @@ -79,447 +41,3 @@ void _POSIX_Condition_variables_Manager_initialization( FALSE ); } - -/*PAGE - * - * 11.4.1 Condition Variable Initialization Attributes, - * P1003.1c/Draft 10, p. 96 - */ - -int pthread_condattr_init( - pthread_condattr_t *attr -) -{ - if ( !attr ) - return EINVAL; - - *attr = _POSIX_Condition_variables_Default_attributes; - return 0; -} - -/*PAGE - * - * 11.4.1 Condition Variable Initialization Attributes, - * P1003.1c/Draft 10, p. 96 - */ - -int pthread_condattr_destroy( - pthread_condattr_t *attr -) -{ - if ( !attr || attr->is_initialized == FALSE ) - return EINVAL; - - attr->is_initialized = FALSE; - return 0; -} - -/*PAGE - * - * 11.4.1 Condition Variable Initialization Attributes, - * P1003.1c/Draft 10, p. 96 - */ - -int pthread_condattr_getpshared( - const pthread_condattr_t *attr, - int *pshared -) -{ - if ( !attr ) - return EINVAL; - - *pshared = attr->process_shared; - return 0; -} - -/*PAGE - * - * 11.4.1 Condition Variable Initialization Attributes, - * P1003.1c/Draft 10, p. 96 - */ - -int pthread_condattr_setpshared( - pthread_condattr_t *attr, - int pshared -) -{ - if ( !attr ) - return EINVAL; - - switch ( pshared ) { - case PTHREAD_PROCESS_SHARED: - case PTHREAD_PROCESS_PRIVATE: - attr->process_shared = pshared; - return 0; - - default: - return EINVAL; - } -} - -/*PAGE - * - * 11.4.2 Initializing and Destroying a Condition Variable, - * P1003.1c/Draft 10, p. 87 - */ - -int pthread_cond_init( - pthread_cond_t *cond, - const pthread_condattr_t *attr -) -{ - POSIX_Condition_variables_Control *the_cond; - const pthread_condattr_t *the_attr; - - if ( attr ) the_attr = attr; - else the_attr = &_POSIX_Condition_variables_Default_attributes; - - /* - * XXX: Be careful about attributes when global!!! - */ - - if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED ) - return POSIX_MP_NOT_IMPLEMENTED(); - - if ( !the_attr->is_initialized ) - return EINVAL; - - _Thread_Disable_dispatch(); - - the_cond = _POSIX_Condition_variables_Allocate(); - - if ( !the_cond ) { - _Thread_Enable_dispatch(); - return ENOMEM; - } - -#if defined(RTEMS_MULTIPROCESSING) - if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED && - !( _Objects_MP_Allocate_and_open( &_POSIX_Condition_variables_Information, - 0, the_cond->Object.id, FALSE ) ) ) { - _POSIX_Condition_variables_Free( the_cond ); - _Thread_Enable_dispatch(); - return EAGAIN; - } -#endif - - the_cond->process_shared = the_attr->process_shared; - - the_cond->Mutex = POSIX_CONDITION_VARIABLES_NO_MUTEX; - -/* XXX some more initialization might need to go here */ - _Thread_queue_Initialize( - &the_cond->Wait_queue, - OBJECTS_POSIX_CONDITION_VARIABLES, - THREAD_QUEUE_DISCIPLINE_FIFO, - STATES_WAITING_FOR_CONDITION_VARIABLE, -#if defined(RTEMS_MULTIPROCESSING) - _POSIX_Condition_variables_MP_Send_extract_proxy, -#else - NULL, -#endif - ETIMEDOUT - ); - - _Objects_Open( - &_POSIX_Condition_variables_Information, - &the_cond->Object, - 0 - ); - - *cond = the_cond->Object.id; - -#if defined(RTEMS_MULTIPROCESSING) - if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED ) - _POSIX_Condition_variables_MP_Send_process_packet( - POSIX_CONDITION_VARIABLES_MP_ANNOUNCE_CREATE, - the_cond->Object.id, - 0, /* Name not used */ - 0 /* Not used */ - ); -#endif - - _Thread_Enable_dispatch(); - - return 0; -} - -/*PAGE - * - * 11.4.2 Initializing and Destroying a Condition Variable, - * P1003.1c/Draft 10, p. 87 - */ - -int pthread_cond_destroy( - pthread_cond_t *cond -) -{ - register POSIX_Condition_variables_Control *the_cond; - Objects_Locations location; - - the_cond = _POSIX_Condition_variables_Get( cond, &location ); - switch ( location ) { - case OBJECTS_REMOTE: -#if defined(RTEMS_MULTIPROCESSING) - _Thread_Dispatch(); - return POSIX_MP_NOT_IMPLEMENTED(); - return EINVAL; -#endif - - case OBJECTS_ERROR: - return EINVAL; - - - case OBJECTS_LOCAL: - - if ( _Thread_queue_First( &the_cond->Wait_queue ) ) { - _Thread_Enable_dispatch(); - return EBUSY; - } - - _Objects_Close( - &_POSIX_Condition_variables_Information, - &the_cond->Object - ); - - _POSIX_Condition_variables_Free( the_cond ); - -#if defined(RTEMS_MULTIPROCESSING) - if ( the_cond->process_shared == PTHREAD_PROCESS_SHARED ) { - - _Objects_MP_Close( - &_POSIX_Condition_variables_Information, - the_cond->Object.id - ); - - _POSIX_Condition_variables_MP_Send_process_packet( - POSIX_CONDITION_VARIABLES_MP_ANNOUNCE_DELETE, - the_cond->Object.id, - 0, /* Not used */ - 0 /* Not used */ - ); - } -#endif - _Thread_Enable_dispatch(); - return 0; - } - return POSIX_BOTTOM_REACHED(); -} - -/*PAGE - * - * _POSIX_Condition_variables_Signal_support - * - * A support routine which implements guts of the broadcast and single task - * wake up version of the "signal" operation. - */ - -int _POSIX_Condition_variables_Signal_support( - pthread_cond_t *cond, - boolean is_broadcast -) -{ - register POSIX_Condition_variables_Control *the_cond; - Objects_Locations location; - Thread_Control *the_thread; - - the_cond = _POSIX_Condition_variables_Get( cond, &location ); - switch ( location ) { - case OBJECTS_REMOTE: -#if defined(RTEMS_MULTIPROCESSING) - _Thread_Dispatch(); - return POSIX_MP_NOT_IMPLEMENTED(); - return EINVAL; -#endif - - case OBJECTS_ERROR: - return EINVAL; - case OBJECTS_LOCAL: - - do { - the_thread = _Thread_queue_Dequeue( &the_cond->Wait_queue ); - if ( !the_thread ) - the_cond->Mutex = POSIX_CONDITION_VARIABLES_NO_MUTEX; - } while ( is_broadcast && the_thread ); - - _Thread_Enable_dispatch(); - - return 0; - } - return POSIX_BOTTOM_REACHED(); -} - -/*PAGE - * - * 11.4.3 Broadcasting and Signaling a Condition, P1003.1c/Draft 10, p. 101 - */ - -int pthread_cond_signal( - pthread_cond_t *cond -) -{ - return _POSIX_Condition_variables_Signal_support( cond, FALSE ); -} - -/*PAGE - * - * 11.4.3 Broadcasting and Signaling a Condition, P1003.1c/Draft 10, p. 101 - */ - -int pthread_cond_broadcast( - pthread_cond_t *cond -) -{ - return _POSIX_Condition_variables_Signal_support( cond, TRUE ); -} - -/*PAGE - * - * _POSIX_Condition_variables_Wait_support - * - * A support routine which implements guts of the blocking, non-blocking, and - * timed wait version of condition variable wait routines. - */ - -int _POSIX_Condition_variables_Wait_support( - pthread_cond_t *cond, - pthread_mutex_t *mutex, - Watchdog_Interval timeout, - boolean already_timedout -) -{ - register POSIX_Condition_variables_Control *the_cond; - Objects_Locations location; - int status; - int mutex_status; - - if ( !_POSIX_Mutex_Get( mutex, &location ) ) { - return EINVAL; - } - - _Thread_Unnest_dispatch(); - - the_cond = _POSIX_Condition_variables_Get( cond, &location ); - switch ( location ) { - case OBJECTS_REMOTE: -#if defined(RTEMS_MULTIPROCESSING) - _Thread_Dispatch(); - return POSIX_MP_NOT_IMPLEMENTED(); - return EINVAL; -#endif - case OBJECTS_ERROR: - return EINVAL; - case OBJECTS_LOCAL: - - if ( the_cond->Mutex && ( the_cond->Mutex != *mutex ) ) { - _Thread_Enable_dispatch(); - return EINVAL; - } - - (void) pthread_mutex_unlock( mutex ); -/* XXX ignore this for now since behavior is undefined - if ( mutex_status ) { - _Thread_Enable_dispatch(); - return EINVAL; - } -*/ - - if ( !already_timedout ) { - the_cond->Mutex = *mutex; - - _Thread_queue_Enter_critical_section( &the_cond->Wait_queue ); - _Thread_Executing->Wait.return_code = 0; - _Thread_Executing->Wait.queue = &the_cond->Wait_queue; - _Thread_Executing->Wait.id = *cond; - - _Thread_queue_Enqueue( &the_cond->Wait_queue, timeout ); - - _Thread_Enable_dispatch(); - - /* - * Switch ourself out because we blocked as a result of the - * _Thread_queue_Enqueue. - */ - - status = _Thread_Executing->Wait.return_code; - if ( status && status != ETIMEDOUT ) - return status; - - } else { - _Thread_Enable_dispatch(); - status = ETIMEDOUT; - } - - /* - * When we get here the dispatch disable level is 0. - */ - - mutex_status = pthread_mutex_lock( mutex ); - if ( mutex_status ) - return EINVAL; - - return status; - } - return POSIX_BOTTOM_REACHED(); -} - -/*PAGE - * - * 11.4.4 Waiting on a Condition, P1003.1c/Draft 10, p. 105 - */ - -int pthread_cond_wait( - pthread_cond_t *cond, - pthread_mutex_t *mutex -) -{ - return _POSIX_Condition_variables_Wait_support( - cond, - mutex, - THREAD_QUEUE_WAIT_FOREVER, - FALSE - ); -} - -/*PAGE - * - * 11.4.4 Waiting on a Condition, P1003.1c/Draft 10, p. 105 - */ - -int pthread_cond_timedwait( - pthread_cond_t *cond, - pthread_mutex_t *mutex, - const struct timespec *abstime -) -{ - Watchdog_Interval timeout; - struct timespec current_time; - struct timespec difference; - boolean already_timedout = FALSE; - - if ( !abstime ) - return EINVAL; - - /* - * The abstime is a walltime. We turn it into an interval. - */ - - (void) clock_gettime( CLOCK_REALTIME, ¤t_time ); - - /* XXX probably some error checking should go here */ - - _POSIX_Timespec_subtract( ¤t_time, abstime, &difference ); - - if ( ( difference.tv_sec < 0 ) || ( ( difference.tv_sec == 0 ) && - ( difference.tv_nsec < 0 ) ) ) - already_timedout = TRUE; - - timeout = _POSIX_Timespec_to_interval( &difference ); - - return _POSIX_Condition_variables_Wait_support( - cond, - mutex, - timeout, - already_timedout - ); -} -- cgit v1.2.3