118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/****************************************************************************
|
|
* sched/group/group_suspendchildren.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 <sys/types.h>
|
|
#include <stdint.h>
|
|
#include <sched.h>
|
|
#include <pthread.h>
|
|
|
|
#include <nuttx/sched.h>
|
|
|
|
#include "sched/sched.h"
|
|
#include "group/group.h"
|
|
|
|
#ifdef HAVE_GROUP_MEMBERS
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: group_suspend_children_handler
|
|
*
|
|
* Description:
|
|
* Callback from group_foreachchild that handles one member of the group.
|
|
*
|
|
* Input Parameters:
|
|
* pid - The ID of the group member that may be suspended.
|
|
* arg - The PID of the thread to be retained.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) always
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int group_suspend_children_handler(pid_t pid, FAR void *arg)
|
|
{
|
|
FAR struct tcb_s *rtcb;
|
|
|
|
/* Suspend all threads except for the one specified by the argument */
|
|
|
|
if (pid != (pid_t)((uintptr_t)arg))
|
|
{
|
|
/* Suspend this thread if it is still alive. */
|
|
|
|
rtcb = nxsched_get_tcb(pid);
|
|
if (rtcb != NULL)
|
|
{
|
|
nxsched_suspend(rtcb);
|
|
}
|
|
}
|
|
|
|
/* Always return zero. We need to visit each member of the group. */
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: group_suspend_children
|
|
*
|
|
* Description:
|
|
* Suspend all children of a task except for the specified task. This is
|
|
* SIGTSTP/SIGSTOP default signal action logic. When the main task is
|
|
* suspended, all of its child pthreads must also be suspended.
|
|
*
|
|
* Input Parameters:
|
|
* tcb - TCB of the task to be retained.
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
int group_suspend_children(FAR struct tcb_s *tcb)
|
|
{
|
|
int ret;
|
|
|
|
/* Lock the scheduler so that there this thread will not lose priority
|
|
* until all of its children are suspended.
|
|
*/
|
|
|
|
sched_lock();
|
|
ret = group_foreachchild(tcb->group, group_suspend_children_handler,
|
|
(FAR void *)((uintptr_t)tcb->pid));
|
|
sched_unlock();
|
|
return ret;
|
|
}
|
|
|
|
#endif /* HAVE_GROUP_MEMBERS */
|