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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScoreThread
*
* @brief This source file contains the implementation of
* _Thread_Scheduler_process_requests().
*/
/*
* Copyright (c) 2016 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/threadimpl.h>
#include <rtems/score/schedulerimpl.h>
#if defined(RTEMS_SMP)
static void _Thread_Scheduler_withdraw_nodes(
Thread_Control *the_thread,
Scheduler_Node *scheduler_node
)
{
while ( scheduler_node != NULL ) {
Scheduler_Node *next;
const Scheduler_Control *scheduler;
ISR_lock_Context lock_context;
next = scheduler_node->Thread.Scheduler_node.next;
#if defined(RTEMS_DEBUG)
scheduler_node->Thread.Scheduler_node.next = NULL;
#endif
scheduler = _Scheduler_Node_get_scheduler( scheduler_node );
_Scheduler_Acquire_critical( scheduler, &lock_context );
( *scheduler->Operations.withdraw_node )(
scheduler,
the_thread,
scheduler_node,
THREAD_SCHEDULER_READY
);
_Scheduler_Release_critical( scheduler, &lock_context );
scheduler_node = next;
}
}
void _Thread_Scheduler_process_requests( Thread_Control *the_thread )
{
ISR_lock_Context lock_context;
Scheduler_Node *scheduler_node;
_Thread_Scheduler_acquire_critical( the_thread, &lock_context );
scheduler_node = the_thread->Scheduler.requests;
if ( scheduler_node != NULL ) {
Scheduler_Node *remove;
the_thread->Scheduler.requests = NULL;
remove = NULL;
do {
Scheduler_Node_request request;
Scheduler_Node *next;
request = scheduler_node->Thread.request;
scheduler_node->Thread.request = SCHEDULER_NODE_REQUEST_NOT_PENDING;
next = scheduler_node->Thread.next_request;
#if defined(RTEMS_DEBUG)
scheduler_node->Thread.next_request = NULL;
#endif
if ( request == SCHEDULER_NODE_REQUEST_ADD ) {
++the_thread->Scheduler.helping_nodes;
_Chain_Append_unprotected(
&the_thread->Scheduler.Scheduler_nodes,
&scheduler_node->Thread.Scheduler_node.Chain
);
} else if ( request == SCHEDULER_NODE_REQUEST_REMOVE ) {
--the_thread->Scheduler.helping_nodes;
_Chain_Extract_unprotected(
&scheduler_node->Thread.Scheduler_node.Chain
);
scheduler_node->Thread.Scheduler_node.next = remove;
remove = scheduler_node;
} else {
_Assert( request == SCHEDULER_NODE_REQUEST_NOTHING );
}
scheduler_node = next;
} while ( scheduler_node != NULL );
_Thread_Scheduler_release_critical( the_thread, &lock_context );
_Thread_Scheduler_withdraw_nodes( the_thread, remove );
} else {
_Thread_Scheduler_release_critical( the_thread, &lock_context );
}
}
#endif
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