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/*
* Thread Queue Handler
*
*
* COPYRIGHT (c) 1989-2008.
* 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 <rtems/system.h>
#include <rtems/score/chain.h>
#include <rtems/score/isr.h>
#include <rtems/score/object.h>
#include <rtems/score/states.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#include <rtems/score/tqdata.h>
/*PAGE
*
* _Thread_queue_Dequeue
*
* This routine removes a thread from the specified threadq. If the
* threadq discipline is FIFO, it unblocks a thread, and cancels its
* timeout timer. Priority discipline is processed elsewhere.
*
* Input parameters:
* the_thread_queue - pointer to threadq
*
* Output parameters:
* returns - thread dequeued or NULL
*
* INTERRUPT LATENCY:
* check sync
*/
Thread_Control *_Thread_queue_Dequeue(
Thread_queue_Control *the_thread_queue
)
{
Thread_Control *(*dequeue_p)( Thread_queue_Control * );
Thread_Control *the_thread;
ISR_Level level;
Thread_blocking_operation_States sync_state;
if ( the_thread_queue->discipline == THREAD_QUEUE_DISCIPLINE_PRIORITY )
dequeue_p = _Thread_queue_Dequeue_priority;
else /* must be THREAD_QUEUE_DISCIPLINE_FIFO */
dequeue_p = _Thread_queue_Dequeue_fifo;
the_thread = (*dequeue_p)( the_thread_queue );
_ISR_Disable( level );
if ( !the_thread ) {
sync_state = the_thread_queue->sync_state;
if ( (sync_state == THREAD_BLOCKING_OPERATION_TIMEOUT) ||
(sync_state == THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED) ) {
the_thread_queue->sync_state = THREAD_BLOCKING_OPERATION_SATISFIED;
the_thread = _Thread_Executing;
}
}
_ISR_Enable( level );
return the_thread;
}
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