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/**
* @file
*
* @ingroup RTEMSScoreThreadQueue
*
* @brief This source file contains the implementation of
* _Thread_queue_Flush_default_filter(),
* _Thread_queue_Flush_status_object_was_deleted(),
* _Thread_queue_Flush_status_unavailable(), and
* _Thread_queue_Flush_critical().
*/
/*
* 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.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/threadimpl.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/status.h>
Thread_Control *_Thread_queue_Flush_default_filter(
Thread_Control *the_thread,
Thread_queue_Queue *queue,
Thread_queue_Context *queue_context
)
{
(void) queue;
(void) queue_context;
return the_thread;
}
Thread_Control *_Thread_queue_Flush_status_object_was_deleted(
Thread_Control *the_thread,
Thread_queue_Queue *queue,
Thread_queue_Context *queue_context
)
{
the_thread->Wait.return_code = STATUS_OBJECT_WAS_DELETED;
(void) queue;
(void) queue_context;
return the_thread;
}
Thread_Control *_Thread_queue_Flush_status_unavailable(
Thread_Control *the_thread,
Thread_queue_Queue *queue,
Thread_queue_Context *queue_context
)
{
the_thread->Wait.return_code = STATUS_UNAVAILABLE;
(void) queue;
(void) queue_context;
return the_thread;
}
size_t _Thread_queue_Flush_critical(
Thread_queue_Queue *queue,
const Thread_queue_Operations *operations,
Thread_queue_Flush_filter filter,
Thread_queue_Context *queue_context
)
{
size_t flushed;
size_t priority_updates;
Chain_Control unblock;
Chain_Node *node;
Chain_Node *tail;
flushed = 0;
priority_updates = 0;
_Chain_Initialize_empty( &unblock );
while ( true ) {
Thread_queue_Heads *heads;
Thread_Control *first;
bool do_unblock;
heads = queue->heads;
if ( heads == NULL ) {
break;
}
first = ( *operations->first )( heads );
first = ( *filter )( first, queue, queue_context );
if ( first == NULL ) {
break;
}
/*
* We do not have enough space in the queue context to collect all priority
* updates, so clear it each time and accumulate the priority updates.
*/
_Thread_queue_Context_clear_priority_updates( queue_context );
do_unblock = _Thread_queue_Extract_locked(
queue,
operations,
first,
queue_context
);
if ( do_unblock ) {
Scheduler_Node *scheduler_node;
scheduler_node = _Thread_Scheduler_get_home_node( first );
_Chain_Append_unprotected(
&unblock,
&scheduler_node->Wait.Priority.Node.Node.Chain
);
}
priority_updates +=
_Thread_queue_Context_get_priority_updates( queue_context );
++flushed;
}
node = _Chain_First( &unblock );
tail = _Chain_Tail( &unblock );
if ( node != tail ) {
Per_CPU_Control *cpu_self;
cpu_self = _Thread_queue_Dispatch_disable( queue_context );
_Thread_queue_Queue_release( queue, &queue_context->Lock_context.Lock_context );
do {
Scheduler_Node *scheduler_node;
Thread_Control *the_thread;
Chain_Node *next;
next = _Chain_Next( node );
scheduler_node = SCHEDULER_NODE_OF_WAIT_PRIORITY_NODE( node );
the_thread = _Scheduler_Node_get_owner( scheduler_node );
_Thread_Remove_timer_and_unblock( the_thread, queue );
node = next;
} while ( node != tail );
if ( priority_updates != 0 ) {
Thread_Control *owner;
ISR_lock_Context lock_context;
owner = queue->owner;
_Assert( owner != NULL );
_Thread_State_acquire( owner, &lock_context );
_Scheduler_Update_priority( owner );
_Thread_State_release( owner, &lock_context );
}
_Thread_Dispatch_enable( cpu_self );
} else {
_Thread_queue_Queue_release( queue, &queue_context->Lock_context.Lock_context );
}
return flushed;
}
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