01207cc66e
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@338 42af7a65-404d-4744-a932-0658087f49c3
121 lines
4.7 KiB
C
121 lines
4.7 KiB
C
/****************************************************************************
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* pthread_schedsetprio.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 Gregory Nutt 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 <nuttx/config.h>
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#include <sys/types.h>
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#include <sched.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include "os_internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_setsetprio
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*
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* Description:
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* The pthread_setschedprio() function sets the scheduling priority for the
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* thread whose thread ID is given by 'thread' to the value given by 'prio'.
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* If the thread_setschedprio() function fails, the scheduling priority
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* of the target thread will not be changed.
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*
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* Inputs:
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* thread - the thread ID of the task to reprioritize.
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* prio - The new thread priority. The range of valid priority numbers is
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* from SCHED_PRIORITY_MIN through SCHED_PRIORITY_MAX.
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*
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* Return Value:
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* OK if successful, otherwise an error number. This function can
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* fail for the following reasons:
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*
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* EINVAL - prio is out of range.
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* ESRCH - thread ID does not correspond to any thread.
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*
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* Assumptions:
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*
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****************************************************************************/
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int pthread_setschedprio(pthread_t thread, int prio)
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{
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struct sched_param param;
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int ret;
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/* Set the errno to some non-zero value (failsafe) */
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*get_errno_ptr() = EINVAL;
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/* Call sched_setparam() to change the priority */
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param.sched_priority = prio;
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ret = sched_setparam((pid_t)thread, ¶m);
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if (ret != OK)
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{
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/* If sched_setparam() fails, return the errno */
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ret = *get_errno_ptr();
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}
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return ret;
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}
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