92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/****************************************************************************
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* sched/sched/sched_reprioritize.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 <stdint.h>
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#include <sched.h>
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#include <errno.h>
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#include <nuttx/sched.h>
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#include "sched/sched.h"
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#ifdef CONFIG_PRIORITY_INHERITANCE
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsched_reprioritize
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*
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* Description:
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* This function sets the priority of a specified task.
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*
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* NOTE: Setting a task's priority to the same value has a similar effect
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* to sched_yield() -- The task will be moved to after all other tasks
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* with the same priority.
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*
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* Input Parameters:
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* tcb - the TCB of task to reprioritize.
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* sched_priority - The new task priority
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*
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* Returned Value:
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* On success, sched_reporioritize() returns 0 (OK). On error, a negated
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* errno value is returned.
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*
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* EINVAL The parameter 'param' is invalid or does not make sense for the
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* current scheduling policy.
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* EPERM The calling task does not have appropriate privileges.
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* ESRCH The task whose ID is pid could not be found.
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*
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****************************************************************************/
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int nxsched_reprioritize(FAR struct tcb_s *tcb, int sched_priority)
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{
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/* This function is equivalent to nxsched_set_priority() BUT it also has
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* the side effect of discarding all priority inheritance history. This
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* is done only on explicit, user-initiated reprioritization.
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*/
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int ret = nxsched_set_priority(tcb, sched_priority);
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if (ret == 0)
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{
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/* Reset the base_priority -- the priority that the thread would return
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* to once it posts the semaphore.
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*/
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tcb->base_priority = (uint8_t)sched_priority;
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/* Discard any pending reprioritizations as well */
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#if CONFIG_SEM_NNESTPRIO > 0
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tcb->npend_reprio = 0;
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#endif
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}
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return ret;
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}
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#endif /* CONFIG_PRIORITY_INHERITANCE */
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