111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/****************************************************************************
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* sched/task/exit.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 <stdlib.h>
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#include <unistd.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/fs/fs.h>
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#include "task/task.h"
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#include "group/group.h"
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#include "sched/sched.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: _exit
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*
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* Description:
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* This function causes the currently executing task to cease
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* to exist. This is a special case of task_delete() where the task to
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* be deleted is the currently executing task. It is more complex because
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* a context switch must be perform to the next ready to run task.
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*
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****************************************************************************/
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void _exit(int status)
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{
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up_exit(status);
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}
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/****************************************************************************
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* Name: exit
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*
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* Description:
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* The exit() function causes normal process termination and the value of
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* status & 0377 to be returned to the parent.
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*
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* All functions registered with atexit() and on_exit() are called, in the
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* reverse order of their registration.
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*
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* All open streams are flushed and closed.
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*
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****************************************************************************/
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void exit(int status)
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{
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FAR struct tcb_s *tcb = this_task();
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/* Only the lower 8-bits of status are used */
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status &= 0xff;
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#ifdef HAVE_GROUP_MEMBERS
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/* Kill all of the children of the group, preserving only this thread.
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* exit() is normally called from the main thread of the task. pthreads
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* exit through a different mechanism.
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*/
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group_kill_children(tcb);
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#endif
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#if !defined(CONFIG_DISABLE_PTHREAD) && !defined(CONFIG_PTHREAD_MUTEX_UNSAFE)
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/* Recover any mutexes still held by the canceled thread */
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pthread_mutex_inconsistent(tcb);
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#endif
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/* Perform common task termination logic. This will get called again later
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* through logic kicked off by _exit(). However, we need to call it before
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* calling _exit() in order to handle atexit() and on_exit() callbacks and
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* so that we can flush buffered I/O (both of which may required
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* suspending).
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*/
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nxtask_exithook(tcb, status, false);
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/* Then "really" exit. Only the lower 8 bits of the exit status are
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* used.
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*/
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_exit(status);
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}
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