110 lines
4.2 KiB
C
110 lines
4.2 KiB
C
/****************************************************************************
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* sched/pthread/pthread_setschedparam.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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_setschedparam
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*
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* Description:
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* The pthread_setschedparam() functions will set the scheduling policy
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* and parameters of threads. For SCHED_FIFO and SCHED_RR, the only
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* required member of the sched_param structure is the priority
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* sched_priority.
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*
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* The pthread_setschedparam() function will set the scheduling policy
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* and associated scheduling parameters for the thread whose thread ID
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* is given by 'thread' to the policy and associated parameters provided
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* in 'policy' and 'param', respectively.
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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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* If the pthread_setschedparam() function fails, the scheduling parameters
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* will not be changed for the target thread.
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*
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* Input Parameters:
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* thread - The ID of thread whose scheduling parameters will be modified.
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* policy - The new scheduling policy of the thread. Either SCHED_FIFO or
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* SCHED_RR. SCHED_OTHER and SCHED_SPORADIC are not supported.
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* param - Provides the new priority of the thread.
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*
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* Returned Value:
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* 0 if successful. Otherwise, an error code identifying the cause of the
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* failure:
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*
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* EINVAL The value specified by 'policy' or one of the scheduling
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* parameters associated with the scheduling policy 'policy' is
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* invalid.
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* ENOTSUP An attempt was made to set the policy or scheduling parameters
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* to an unsupported value (SCHED_OTHER and SCHED_SPORADIC in
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* particular are not supported)
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* EPERM The caller does not have the appropriate permission to set
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* either the scheduling parameters or the scheduling policy of
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* the specified thread. Or, the implementation does not allow
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* the application to modify one of the parameters to the value
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* specified.
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* ESRCH The value specified by thread does not refer to a existing
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* thread.
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*
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****************************************************************************/
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int pthread_setschedparam(pthread_t thread, int policy,
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FAR const struct sched_param *param)
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{
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int ret;
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sinfo("thread ID=%d policy=%d param=%p\n", thread, policy, param);
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/* Let nxsched_set_scheduler do all of the work */
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ret = nxsched_set_scheduler((pid_t)thread, policy, param);
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if (ret < 0)
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{
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/* If nxsched_set_scheduler() fails, return the positive errno value */
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ret = -ret;
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}
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return ret;
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}
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