33e30239f1
reason: In the kernel, we are planning to remove all occurrences of up_cpu_pause as one of the steps to simplify the implementation of critical sections. The goal is to enable spin_lock_irqsave to encapsulate critical sections, thereby facilitating the replacement of critical sections(big lock) with smaller spin_lock_irqsave(small lock) Signed-off-by: hujun5 <hujun5@xiaomi.com>
100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/****************************************************************************
|
|
* sched/task/exit.c
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <debug.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/fs/fs.h>
|
|
|
|
#include "task/task.h"
|
|
#include "group/group.h"
|
|
#include "sched/sched.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: _exit
|
|
*
|
|
* Description:
|
|
* This function causes the currently executing task to cease
|
|
* to exist. This is a special case of task_delete() where the task to
|
|
* be deleted is the currently executing task. It is more complex because
|
|
* a context switch must be perform to the next ready to run task.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void _exit(int status)
|
|
{
|
|
FAR struct tcb_s *tcb = this_task();
|
|
|
|
/* Only the lower 8-bits of status are used */
|
|
|
|
status &= 0xff;
|
|
|
|
#ifdef HAVE_GROUP_MEMBERS
|
|
/* Kill all of the children of the group, preserving only this thread.
|
|
* exit() is normally called from the main thread of the task. pthreads
|
|
* exit through a different mechanism.
|
|
*/
|
|
|
|
if ((tcb->flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_KERNEL)
|
|
{
|
|
group_kill_children(tcb);
|
|
}
|
|
|
|
#endif
|
|
|
|
/* Make sure that we are in a critical section with local interrupts.
|
|
* The IRQ state will be restored when the next task is started.
|
|
*/
|
|
|
|
enter_critical_section();
|
|
|
|
/* Perform common task termination logic. This will get called again later
|
|
* through logic kicked off by up_exit().
|
|
*
|
|
* REVISIT: Tt should not be necessary to call this here, but releasing the
|
|
* task group (especially the group file list) requires that it is done
|
|
* here.
|
|
*
|
|
* The reason? up_exit removes the current process from the ready-to-run
|
|
* list and trying to execute code that depends on this_task() crashes at
|
|
* once, or does something very naughty.
|
|
*/
|
|
|
|
tcb->flags |= TCB_FLAG_EXIT_PROCESSING;
|
|
|
|
nxtask_exithook(tcb, status);
|
|
|
|
up_exit(status);
|
|
}
|