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/*
* Schedule Simple Handler / Ready Queue Enqueue First
*
* COPYRIGHT (c) 2011.
* 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/thread.h>
#include <rtems/score/schedulersimple.h>
void _Scheduler_simple_Ready_queue_enqueue_first(
Thread_Control *the_thread
)
{
Chain_Control *ready;
Chain_Node *the_node;
Thread_Control *current;
ready = (Chain_Control *)_Scheduler.information;
current = (Thread_Control *)ready;
/*
* Do NOT need to check for end of chain because there is always
* at least one task on the ready chain -- the IDLE task. It can
* never block, should never attempt to obtain a semaphore or mutex,
* and thus will always be there.
*/
for ( the_node = _Chain_First(ready) ; ; the_node = the_node->next ) {
current = (Thread_Control *) the_node;
/* break when AT HEAD OF (or PAST) our priority */
if ( the_thread->current_priority <= current->current_priority ) {
current = (Thread_Control *)current->Object.Node.previous;
break;
}
}
/* enqueue */
_Chain_Insert_unprotected( (Chain_Node *)current, &the_thread->Object.Node );
}
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