8935ac4cc3
Gregory Nutt has submitted the SGA and we can mograte the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
133 lines
4.1 KiB
C
133 lines
4.1 KiB
C
/****************************************************************************
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* sched/sched/sched_getscheduler.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 <sched.h>
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#include <errno.h>
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#include <nuttx/sched.h>
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#include <nuttx/arch.h>
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#include "sched/sched.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsched_get_scheduler
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*
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* Description:
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* sched_getscheduler() returns the scheduling policy currently
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* applied to the task identified by pid. If pid equals zero, the
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* policy of the calling task will be retrieved.
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*
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* This functions is identical to the function sched_getscheduler(),
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* differing only in its return value: This function does not modify
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* the errno variable.
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*
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* This is a non-standard, internal OS function and is not intended for
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* use by application logic. Applications should use the standard
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* sched_getscheduler().
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*
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* Input Parameters:
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* pid - the task ID of the task to query. If pid is zero, the
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* calling task is queried.
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*
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* Returned Value:
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* On success, sched_getscheduler() returns the policy for the task
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* (either SCHED_FIFO or SCHED_RR). On error, a negated errno value
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* returned:
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*
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* ESRCH The task whose ID is pid could not be found.
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*
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****************************************************************************/
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int nxsched_get_scheduler(pid_t pid)
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{
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FAR struct tcb_s *tcb;
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int policy;
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/* Verify that the PID corresponds to a real task */
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if (pid == 0)
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{
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tcb = this_task();
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}
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else
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{
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tcb = nxsched_get_tcb(pid);
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}
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if (tcb == NULL)
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{
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return -ESRCH;
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}
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/* Return the scheduling policy from the TCB. NOTE that the user-
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* interpretable values are 1 based; the TCB values are zero-based.
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*/
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policy = (tcb->flags & TCB_FLAG_POLICY_MASK) >> TCB_FLAG_POLICY_SHIFT;
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return policy + 1;
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}
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/****************************************************************************
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* Name: sched_getscheduler
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*
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* Description:
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* sched_getscheduler() returns the scheduling policy currently
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* applied to the task identified by pid. If pid equals zero, the
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* policy of the calling task will be retrieved.
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*
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* sched_getscheduler() is a simply wrapper around nxsched_get_scheduler()
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* that sets the errno value in the event of an error.
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*
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* Input Parameters:
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* pid - the task ID of the task to query. If pid is zero, the
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* calling task is queried.
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*
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* Returned Value:
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* On success, sched_getscheduler() returns the policy for the task
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* (either SCHED_FIFO or SCHED_RR). On error, ERROR (-1) is
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* returned, and errno is set appropriately:
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*
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* ESRCH The task whose ID is pid could not be found.
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*
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****************************************************************************/
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int sched_getscheduler(pid_t pid)
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{
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int ret = nxsched_get_scheduler(pid);
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if (ret < 0)
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{
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set_errno(-ret);
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ret = ERROR;
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}
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return ret;
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}
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