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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.
*/
#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>
/*
* _Thread_queue_Enqueue_fifo
*
* This routine places a blocked thread on a FIFO thread queue.
*
* Input parameters:
* the_thread_queue - pointer to threadq
* the_thread - pointer to the thread to block
*
* Output parameters: NONE
*
* INTERRUPT LATENCY:
* only case
*/
Thread_blocking_operation_States _Thread_queue_Enqueue_fifo (
Thread_queue_Control *the_thread_queue,
Thread_Control *the_thread,
ISR_Level *level_p
)
{
Thread_blocking_operation_States sync_state;
ISR_Level level;
_ISR_Disable( level );
sync_state = the_thread_queue->sync_state;
the_thread_queue->sync_state = THREAD_BLOCKING_OPERATION_SYNCHRONIZED;
if (sync_state == THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED) {
_Chain_Append_unprotected(
&the_thread_queue->Queues.Fifo,
&the_thread->Object.Node
);
the_thread->Wait.queue = the_thread_queue;
the_thread_queue->sync_state = THREAD_BLOCKING_OPERATION_SYNCHRONIZED;
_ISR_Enable( level );
return THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED;
}
/*
* An interrupt completed the thread's blocking request.
* For example, the blocking thread could have been given
* the mutex by an ISR or timed out.
*
* WARNING! Returning with interrupts disabled!
*/
*level_p = level;
return sync_state;
}
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