120 lines
4.5 KiB
C
120 lines
4.5 KiB
C
/****************************************************************************
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* pthread_getschedparam.c
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*
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* Copyright (C) 2007, 2008, 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_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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* 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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* Return 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=0x%p param=0x%p\n", thread, policy, param);
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if (!policy || !param)
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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 schedparams of the thread. */
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ret = sched_getparam((pid_t)thread, param);
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if (ret != OK)
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{
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ret = EINVAL;
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}
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/* Return the policy. */
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*policy = sched_getscheduler((pid_t)thread);
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if (*policy == ERROR)
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{
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ret = get_errno();
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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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