diff options
Diffstat (limited to 'cpukit/posix/src/prwlockdestroy.c')
-rw-r--r-- | cpukit/posix/src/prwlockdestroy.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/cpukit/posix/src/prwlockdestroy.c b/cpukit/posix/src/prwlockdestroy.c new file mode 100644 index 0000000000..8b32517c37 --- /dev/null +++ b/cpukit/posix/src/prwlockdestroy.c @@ -0,0 +1,80 @@ +/* + * POSIX RWLock Manager -- Destroy a RWLock + * + * COPYRIGHT (c) 1989-2007. + * On-Line Applications Research Corporation (OAR). + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.com/license/LICENSE. + * + * $Id$ + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#include <pthread.h> +#include <errno.h> + +#include <rtems/system.h> +#include <rtems/posix/rwlock.h> + +/* + * pthread_rwlock_destroy + * + * This directive allows a thread to delete a rwlock specified by + * the rwlock id. The rwlock is freed back to the inactive + * rwlock chain. + * + * Input parameters: + * rwlock - rwlock id + * + * Output parameters: + * 0 - if successful + * error code - if unsuccessful + */ + +int pthread_rwlock_destroy( + pthread_rwlock_t *rwlock +) +{ + POSIX_RWLock_Control *the_rwlock = NULL; + Objects_Locations location; + + if ( !rwlock ) + return EINVAL; + + the_rwlock = _POSIX_RWLock_Get( rwlock, &location ); + switch ( location ) { + + case OBJECTS_LOCAL: + /* + * If there is at least one thread waiting, then do not delete it. + */ + if ( _Thread_queue_First( &the_rwlock->RWLock.Wait_queue ) != NULL ) { + _Thread_Enable_dispatch(); + return EBUSY; + } + + /* + * POSIX doesn't require behavior when it is locked. + */ + + _Objects_Close( &_POSIX_RWLock_Information, &the_rwlock->Object ); + + _POSIX_RWLock_Free( the_rwlock ); + + _Thread_Enable_dispatch(); + return 0; + +#if defined(RTEMS_MULTIPROCESSING) + case OBJECTS_REMOTE: +#endif + case OBJECTS_ERROR: + break; + } + + return EINVAL; +} |