1550747400
modify the return value according to posix standard
------------
SCHED_GET_PRIORITY_MAX(2)
NAME
sched_get_priority_max, sched_get_priority_min - get static priority range
RETURN VALUE
On success, sched_get_priority_max() and sched_get_priority_min() return the
maximum/minimum priority value for the named scheduling policy.
On error, -1 is returned, and errno is set appropriately.
ERRORS
EINVAL The argument policy does not identify a defined scheduling policy.
Signed-off-by: chao an <anchao@xiaomi.com>
63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
/****************************************************************************
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* libs/libc/sched/sched_getprioritymax.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 <assert.h>
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#include <nuttx/arch.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ched_get_priority_max
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*
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* Description:
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* This function returns the value of the highest possible
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* task priority for a specified scheduling policy.
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*
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* Input Parameters:
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* policy - Scheduling policy requested.
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*
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* Returned Value:
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* The maximum priority value or -1 (ERROR)
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* (errno is not set)
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*
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* Assumptions:
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*
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****************************************************************************/
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int sched_get_priority_max(int policy)
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{
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if (policy < SCHED_FIFO || policy > SCHED_OTHER)
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{
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set_errno(EINVAL);
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return ERROR;
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}
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return SCHED_PRIORITY_MAX;
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}
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