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/**
* @file
*
* @brief Seize Mutex with Blocking
* @ingroup ScoreMutex
*/
/*
* COPYRIGHT (c) 1989-2006.
* 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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/coremuteximpl.h>
#include <rtems/score/statesimpl.h>
#include <rtems/score/thread.h>
Status_Control _CORE_mutex_Seize_interrupt_blocking(
CORE_mutex_Control *the_mutex,
Thread_Control *executing,
Watchdog_Interval timeout,
Thread_queue_Context *queue_context
)
{
Thread_Control *holder;
#if !defined(RTEMS_SMP)
/*
* We must disable thread dispatching here since we enable the interrupts for
* priority inheritance mutexes.
*/
_Thread_Dispatch_disable();
#endif
holder = the_mutex->holder;
#if !defined(RTEMS_SMP)
/*
* To enable interrupts here works only since exactly one executing thread
* exists and only threads are allowed to seize and surrender mutexes with
* the priority inheritance protocol. On SMP configurations more than one
* executing thread may exist, so here we must not release the lock, since
* otherwise the current holder may be no longer the holder of the mutex
* once we released the lock.
*/
_CORE_mutex_Release( the_mutex, queue_context );
#endif
_Thread_Inherit_priority( holder, executing );
#if defined(RTEMS_SMP)
_Thread_queue_Context_set_expected_level( queue_context, 1 );
#else
_ISR_lock_ISR_disable( &queue_context->Lock_context );
_CORE_mutex_Acquire_critical( the_mutex, queue_context );
_Thread_queue_Context_set_expected_level( queue_context, 2 );
#endif
_Thread_queue_Enqueue_critical(
&the_mutex->Wait_queue.Queue,
CORE_MUTEX_TQ_OPERATIONS,
executing,
STATES_WAITING_FOR_MUTEX,
timeout,
queue_context
);
#if !defined(RTEMS_SMP)
_Thread_Dispatch_enable( _Per_CPU_Get() );
#endif
return _Thread_Wait_get_status( executing );
}
Status_Control _CORE_mutex_Seize_no_protocol_slow(
CORE_mutex_Control *the_mutex,
const Thread_queue_Operations *operations,
Thread_Control *executing,
bool wait,
Watchdog_Interval timeout,
Thread_queue_Context *queue_context
)
{
if ( wait ) {
_Thread_queue_Context_set_expected_level( queue_context, 1 );
_Thread_queue_Enqueue_critical(
&the_mutex->Wait_queue.Queue,
operations,
executing,
STATES_WAITING_FOR_MUTEX,
timeout,
queue_context
);
return _Thread_Wait_get_status( executing );
} else {
_CORE_mutex_Release( the_mutex, queue_context );
return STATUS_UNAVAILABLE;
}
}
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