81 lines
3.3 KiB
C
81 lines
3.3 KiB
C
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/****************************************************************************
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* libs/libc/pthread/pthread_attr_setscope.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 <pthread.h>
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#include <errno.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_attr_setscope
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*
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* Description:
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* The function sets the contention scope attribute of the thread
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* attributes object referred to by attr to the value specified in scope.
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* The contention scope attributes defines the set of threads against
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* which a thread competes for resources such as the CPU.
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*
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* POSIX.1 specifies two possible values for scope:
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* PTHREAD_SCOPE_SYSTEM:
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* The thread competes for resources with all other threads in all
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* processes on the system that are in the same scheduling allocation
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* domain (a group of one or more processors).
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* PTHREAD_SCOPE_SYSTEM threads are scheduled relative to one another
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* according to their scheduling policy and priority.
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*
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* PTHREAD_SCOPE_PROCESS
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* The thread competes for resources with all other threads in the
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* same process that were also created with the PTHREAD_SCOPE_PROCESS
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* contention scope. PTHREAD_SCOPE_PROCESS threads are scheduled relative
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* to other threads in the process according to their scheduling policy
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* and priority. POSIX.1 leaves it unspecified how these threads contend
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* with other threads in other process on the system or with other
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* threads in the same process that were created with the
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* PTHREAD_SCOPE_SYSTEM contention scope.
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*
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* Input Parameters:
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* attr - The pointer to pthread attr.
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* scope - contention scope.
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*
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* Returned Value:
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* On success, these functions return 0; on error, they return a nonzero
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* error number.
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*
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****************************************************************************/
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int pthread_attr_setscope(FAR pthread_attr_t *attr, int scope)
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{
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switch (scope)
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{
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case PTHREAD_SCOPE_SYSTEM:
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return 0;
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case PTHREAD_SCOPE_PROCESS:
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return ENOTSUP;
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default:
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return EINVAL;
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}
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}
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