116 lines
3.9 KiB
C
116 lines
3.9 KiB
C
/****************************************************************************
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* sched/pthread/pthread_getschedparam.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 <sys/types.h>
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#include <pthread.h>
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#include <sched.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/sched.h>
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#include "pthread/pthread.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_getschedparam
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*
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* Description:
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* The pthread_getschedparam() functions will get the scheduling policy and
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* parameters of threads. For SCHED_FIFO and SCHED_RR, the only required
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* member of the sched_param structure is the priority sched_priority.
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*
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* The pthread_getschedparam() function will retrieve the scheduling
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* policy and scheduling parameters for the thread whose thread ID is
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* given by 'thread' and will store those values in 'policy' and 'param',
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* respectively. The priority value returned from pthread_getschedparam()
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* will be the value specified by the most recent pthread_setschedparam(),
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* pthread_setschedprio(), or pthread_create() call affecting the target
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* thread. It will not reflect any temporary adjustments to its priority
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* (such as might result of any priority inheritance, for example).
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*
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* The policy parameter may have the value SCHED_FIFO, or SCHED_RR
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* (SCHED_OTHER and SCHED_SPORADIC, in particular, are not supported).
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* The SCHED_FIFO and SCHED_RR policies will have a single scheduling
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* parameter, sched_priority.
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*
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* Input Parameters:
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* thread - The ID of thread whose scheduling parameters will be queried.
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* policy - The location to store the thread's scheduling policy.
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* param - The location to store the thread's priority.
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*
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* Returned Value:
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* 0 if successful. Otherwise, the error code ESRCH if the value specified
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* by thread does not refer to an existing thread.
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*
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* Assumptions:
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*
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****************************************************************************/
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int pthread_getschedparam(pthread_t thread, FAR int *policy,
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FAR struct sched_param *param)
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{
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int ret;
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sinfo("Thread ID=%d policy=%p param=%p\n", thread, policy, param);
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if (policy == NULL || param == NULL)
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{
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ret = EINVAL;
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}
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else
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{
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/* Get the scheduler parameters of the thread. */
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ret = nxsched_get_param((pid_t)thread, param);
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if (ret < 0)
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{
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ret = -ret;
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}
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else
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{
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/* Get the scheduler policy. */
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ret = nxsched_get_scheduler((pid_t)thread);
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if (ret < 0)
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{
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ret = -ret;
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}
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else
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{
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*policy = ret;
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ret = OK;
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}
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}
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}
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sinfo("Returning %d\n", ret);
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return ret;
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}
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