65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/****************************************************************************
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* sched/sched/sched_yield.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/arch.h>
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#include "sched/sched.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sched_yield
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*
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* Description:
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* This function forces the calling task to give up the CPU (only to other
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* tasks at the same priority).
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* 0 (OK) or -1 (ERROR) (errno is not set)
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*
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* Assumptions:
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*
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****************************************************************************/
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int sched_yield(void)
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{
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FAR struct tcb_s *rtcb = this_task();
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int ret;
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/* This equivalent to just resetting the task priority to its current value
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* since this will cause the task to be rescheduled behind any other tasks
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* at the same priority.
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*/
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ret = nxsched_set_priority(rtcb, rtcb->sched_priority);
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return ret < 0 ? ERROR : OK;
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}
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