forked from Imagelibrary/rtems
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*
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* Thread Queue Handler
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*
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*
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* COPYRIGHT (c) 1989-2008.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/system.h>
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#include <rtems/score/chain.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/object.h>
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#include <rtems/score/states.h>
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#include <rtems/score/thread.h>
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#include <rtems/score/threadq.h>
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#include <rtems/score/tqdata.h>
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/*PAGE
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*
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* _Thread_queue_Enqueue_fifo
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*
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* This routine places a blocked thread on a FIFO thread queue.
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*
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* Input parameters:
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* the_thread_queue - pointer to threadq
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* the_thread - pointer to the thread to block
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*
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* Output parameters: NONE
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*
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* INTERRUPT LATENCY:
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* only case
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*/
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Thread_blocking_operation_States _Thread_queue_Enqueue_fifo (
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Thread_queue_Control *the_thread_queue,
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Thread_Control *the_thread,
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ISR_Level *level_p
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)
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{
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Thread_blocking_operation_States sync_state;
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ISR_Level level;
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_ISR_Disable( level );
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sync_state = the_thread_queue->sync_state;
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the_thread_queue->sync_state = THREAD_BLOCKING_OPERATION_SYNCHRONIZED;
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if (sync_state == THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED) {
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_Chain_Append_unprotected(
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&the_thread_queue->Queues.Fifo,
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&the_thread->Object.Node
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);
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the_thread->Wait.queue = the_thread_queue;
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the_thread_queue->sync_state = THREAD_BLOCKING_OPERATION_SYNCHRONIZED;
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_ISR_Enable( level );
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return THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED;
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}
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/*
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* An interrupt completed the thread's blocking request.
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* For example, the blocking thread could have been given
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* the mutex by an ISR or timed out.
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*
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* WARNING! Returning with interrupts disabled!
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*/
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*level_p = level;
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return sync_state;
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}
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