124 lines
5.0 KiB
C
124 lines
5.0 KiB
C
/****************************************************************************
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* sched/pthread/pthread_setschedparam.c
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*
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* Copyright (C) 2007, 2008, 2012, 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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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 "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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* 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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* Return 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 either
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* the scheduling parameters or the scheduling policy of the
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* specified thread. Or, the implementation does not allow the
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* 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 thread.
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*
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* Assumptions:
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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=0x%p\n", thread, policy, param);
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/* Set the errno to some non-zero value (failsafe) */
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set_errno(EINVAL);
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/* Let sched_setscheduler do all of the work */
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ret = sched_setscheduler((pid_t)thread, policy, param);
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if (ret != OK)
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{
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/* If sched_setscheduler() fails, return the errno */
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ret = get_errno();
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}
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return ret;
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}
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