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