8021dfece6
Summary: implement the right semantics: 1. getpid should return the main thread id 2. gettid should return the current thread id Refer to: https://github.com/apache/incubator-nuttx/issues/2499 https://github.com/apache/incubator-nuttx/pull/2518 Signed-off-by: qinwei1 <qinwei1@xiaomi.com>
91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/****************************************************************************
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* libs/libc/unistd/lib_getpriority.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/resource.h>
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#include <sched.h>
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#include <unistd.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: getpriority
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*
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* Description:
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* The getpriority() function shall obtain the nice value of a process,
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* process group, or user.
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*
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* Input Parameters:
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* which - PRIO_PROCESS, PRIO_PGRP, or PRIO_USER, ignored in current
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* implementation.
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* who - Process id is interpreted relative to "which"
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*
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* Returned Value:
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* Upon successful completion, getpriority() shall return an integer in
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* the range -{NZERO} to {NZERO}-1. Otherwise, -1 shall be returned and
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* errno set to indicate the error. The following errors may be
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* reported:
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*
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* - ESRCH: No process was located using the which and who values
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* specified.
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* - EINVAL: which was not one of PRIO_PROCESS, PRIO_PGRP, or
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* PRIO_USER.
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*
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* Assumptions:
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*
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****************************************************************************/
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int getpriority(int which, id_t who)
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{
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struct sched_param param;
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int ret;
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if (which > PRIO_USER || which < PRIO_PROCESS)
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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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if (who == 0)
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{
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who = gettid();
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}
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ret = sched_getparam(who, ¶m);
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if (ret < 0)
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{
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return ret;
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}
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/* Since -1 is a legal return value, clear errno to avoid the chaos */
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set_errno(0);
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return NZERO - param.sched_priority;
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}
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