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/*
* Thread Queue Handler
*
*
* COPYRIGHT (c) 1989-1999.
* 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.
*
* $Id$
*/
#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_Enqueue_fifo
*
* This routine blocks a thread, places it on a thread, and optionally
* starts a timeout timer.
*
* Input parameters:
* the_thread_queue - pointer to threadq
* the_thread - pointer to the thread to block
* timeout - interval to wait
*
* Output parameters: NONE
*
* INTERRUPT LATENCY:
* only case
*/
void _Thread_queue_Enqueue_fifo (
Thread_queue_Control *the_thread_queue,
Thread_Control *the_thread,
Watchdog_Interval timeout
)
{
ISR_Level level;
Thread_queue_States sync_state;
_ISR_Disable( level );
sync_state = the_thread_queue->sync_state;
the_thread_queue->sync_state = THREAD_QUEUE_SYNCHRONIZED;
switch ( sync_state ) {
case THREAD_QUEUE_SYNCHRONIZED:
/*
* This should never happen. It indicates that someone did not
* enter a thread queue critical section.
*/
break;
case THREAD_QUEUE_NOTHING_HAPPENED:
_Chain_Append_unprotected(
&the_thread_queue->Queues.Fifo,
&the_thread->Object.Node
);
_ISR_Enable( level );
return;
case THREAD_QUEUE_TIMEOUT:
the_thread->Wait.return_code = the_thread->Wait.queue->timeout_status;
_ISR_Enable( level );
break;
case THREAD_QUEUE_SATISFIED:
if ( _Watchdog_Is_active( &the_thread->Timer ) ) {
_Watchdog_Deactivate( &the_thread->Timer );
_ISR_Enable( level );
(void) _Watchdog_Remove( &the_thread->Timer );
} else
_ISR_Enable( level );
break;
}
/*
* Global objects with thread queue's should not be operated on from an
* ISR. But the sync code still must allow short timeouts to be processed
* correctly.
*/
_Thread_Unblock( the_thread );
#if defined(RTEMS_MULTIPROCESSING)
if ( !_Objects_Is_local_id( the_thread->Object.id ) )
_Thread_MP_Free_proxy( the_thread );
#endif
}
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