int sem_post(
sem_t *sem
)
{
register POSIX_Semaphore_Control *the_semaphore;
Objects_Locations location;
the_semaphore = _POSIX_Semaphore_Get( sem, &location );
switch ( location ) {
case OBJECTS_LOCAL:
_CORE_semaphore_Surrender(
&the_semaphore->Semaphore,
the_semaphore->Object.id,
#if defined(RTEMS_MULTIPROCESSING)
NULL /* XXX need to define a routine to handle this case */
#else
NULL
#endif
);
_Thread_Enable_dispatch();
return 0;
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
#endif
case OBJECTS_ERROR:
break;
}
rtems_set_errno_and_return_minus_one( EINVAL );
}
int sem_post(
sem_t *sem
)
{
POSIX_Semaphore_Control *the_semaphore;
Objects_Locations location;
the_semaphore = _POSIX_Semaphore_Get( sem, &location );
switch ( location ) {
case OBJECTS_LOCAL:
_CORE_semaphore_Surrender(
&the_semaphore->Semaphore,
the_semaphore->Object.id,
#if defined(RTEMS_MULTIPROCESSING)
NULL /* POSIX Semaphores are local only */
#else
NULL
#endif
);
_Objects_Put( &the_semaphore->Object );
return 0;
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
#endif
case OBJECTS_ERROR:
break;
}
rtems_set_errno_and_return_minus_one( EINVAL );
}
void _MPCI_Announce ( void )
{
_Thread_Disable_dispatch();
(void) _CORE_semaphore_Surrender( &_MPCI_Semaphore, 0, 0 );
_Thread_Enable_dispatch();
}
rtems_status_code rtems_semaphore_release(
rtems_id id
)
{
Semaphore_Control *the_semaphore;
Objects_Locations location;
CORE_mutex_Status mutex_status;
CORE_semaphore_Status semaphore_status;
rtems_attribute attribute_set;
ISR_lock_Context lock_context;
the_semaphore = _Semaphore_Get_interrupt_disable(
id,
&location,
&lock_context
);
switch ( location ) {
case OBJECTS_LOCAL:
attribute_set = the_semaphore->attribute_set;
#if defined(RTEMS_SMP)
if ( _Attributes_Is_multiprocessor_resource_sharing( attribute_set ) ) {
MRSP_Status mrsp_status;
mrsp_status = _MRSP_Surrender(
&the_semaphore->Core_control.mrsp,
_Thread_Executing,
&lock_context
);
return _Semaphore_Translate_MRSP_status_code( mrsp_status );
} else
#endif
if ( !_Attributes_Is_counting_semaphore( attribute_set ) ) {
mutex_status = _CORE_mutex_Surrender(
&the_semaphore->Core_control.mutex,
_Semaphore_Core_mutex_mp_support,
id,
&lock_context
);
return _Semaphore_Translate_core_mutex_return_code( mutex_status );
} else {
semaphore_status = _CORE_semaphore_Surrender(
&the_semaphore->Core_control.semaphore,
_Semaphore_Core_mutex_mp_support,
id,
&lock_context
);
return
_Semaphore_Translate_core_semaphore_return_code( semaphore_status );
}
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
return _Semaphore_MP_Send_request_packet(
SEMAPHORE_MP_RELEASE_REQUEST,
id,
0, /* Not used */
MPCI_DEFAULT_TIMEOUT
);
#endif
case OBJECTS_ERROR:
break;
}
return RTEMS_INVALID_ID;
}
rtems_status_code rtems_semaphore_release( rtems_id id )
{
Semaphore_Control *the_semaphore;
Thread_queue_Context queue_context;
Thread_Control *executing;
Status_Control status;
the_semaphore = _Semaphore_Get( id, &queue_context );
if ( the_semaphore == NULL ) {
#if defined(RTEMS_MULTIPROCESSING)
return _Semaphore_MP_Release( id );
#else
return RTEMS_INVALID_ID;
#endif
}
executing = _Thread_Executing;
_Thread_queue_Context_set_MP_callout(
&queue_context,
_Semaphore_Core_mutex_mp_support
);
switch ( the_semaphore->variant ) {
case SEMAPHORE_VARIANT_MUTEX_INHERIT_PRIORITY:
status = _CORE_recursive_mutex_Surrender(
&the_semaphore->Core_control.Mutex.Recursive,
executing,
&queue_context
);
break;
case SEMAPHORE_VARIANT_MUTEX_PRIORITY_CEILING:
status = _CORE_ceiling_mutex_Surrender(
&the_semaphore->Core_control.Mutex,
executing,
&queue_context
);
break;
case SEMAPHORE_VARIANT_MUTEX_NO_PROTOCOL:
_CORE_recursive_mutex_Surrender_no_protocol(
&the_semaphore->Core_control.Mutex.Recursive,
_Semaphore_Get_operations( the_semaphore ),
executing,
&queue_context
);
status = STATUS_SUCCESSFUL;
break;
case SEMAPHORE_VARIANT_SIMPLE_BINARY:
status = _CORE_semaphore_Surrender(
&the_semaphore->Core_control.Semaphore,
_Semaphore_Get_operations( the_semaphore ),
1,
&queue_context
);
_Assert(
status == STATUS_SUCCESSFUL
|| status == STATUS_MAXIMUM_COUNT_EXCEEDED
);
status = STATUS_SUCCESSFUL;
break;
#if defined(RTEMS_SMP)
case SEMAPHORE_VARIANT_MRSP:
status = _MRSP_Surrender(
&the_semaphore->Core_control.MRSP,
executing,
&queue_context
);
break;
#endif
default:
_Assert( the_semaphore->variant == SEMAPHORE_VARIANT_COUNTING );
status = _CORE_semaphore_Surrender(
&the_semaphore->Core_control.Semaphore,
_Semaphore_Get_operations( the_semaphore ),
UINT32_MAX,
&queue_context
);
break;
}
return _Status_Get( status );
}
