90 lines
3.0 KiB
C
90 lines
3.0 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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/****************************************************************************
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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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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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if ((tcb->flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_KERNEL)
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{
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group_kill_children(tcb);
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}
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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 up_exit().
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*
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* REVISIT: Tt should not be necessary to call this here, but releasing the
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* task group (especially the group file list) requires that it is done
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* here.
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*
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* The reason? up_exit removes the current process from the ready-to-run
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* list and trying to execute code that depends on this_task() crashes at
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* once, or does something very naughty.
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*/
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nxtask_exithook(tcb, status);
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up_exit(status);
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}
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