09e5dca965
In order to ensure the detached thread obtain the correct return value from pthread_join()/pthread_cancel(), the detached thread will create joininfo to save the detached status after thread destroyed. If there are too many of detached threads in the process group, the joininfo will consume too much memory. This is not friendly to embedded MCU devices. This commit keep the semantics as #11898 was introduced, will no longer save joininfo for detached threads to avoid wasting memory. Signed-off-by: chao an <anchao@lixiang.com>
108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/****************************************************************************
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* sched/pthread/pthread_detach.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 <stdbool.h>
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#include <pthread.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include "sched/sched.h"
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#include "group/group.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_detach
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*
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* Description:
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* A thread object may be "detached" to specify that the return value
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* and completion status will not be requested.
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*
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* The caller's task/thread must belong to the same "task group" as the
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* pthread is (or was) a member of. The thread may or may not still
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* be running.
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*
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* Input Parameters:
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* thread
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*
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* Returned Value:
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* 0 if successful. Otherwise, an error code.
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*
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* Assumptions:
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*
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****************************************************************************/
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int pthread_detach(pthread_t thread)
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{
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FAR struct tcb_s *rtcb = this_task();
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FAR struct task_group_s *group = rtcb->group;
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FAR struct task_join_s *join;
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FAR struct tcb_s *tcb;
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int ret;
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nxrmutex_lock(&group->tg_joinlock);
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tcb = nxsched_get_tcb((pid_t)thread);
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if (tcb == NULL || (tcb->flags & TCB_FLAG_JOIN_COMPLETED) != 0)
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{
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/* Destroy the join information */
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ret = pthread_findjoininfo(group, (pid_t)thread, &join, false);
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if (ret == OK)
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{
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pthread_destroyjoin(group, join);
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}
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else
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{
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ret = ESRCH;
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}
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goto errout;
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}
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if ((group != tcb->group) ||
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(tcb->flags & TCB_FLAG_DETACHED) != 0)
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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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tcb->flags |= TCB_FLAG_DETACHED;
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ret = OK;
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}
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errout:
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nxrmutex_unlock(&group->tg_joinlock);
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sinfo("Returning %d\n", ret);
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return ret;
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}
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