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