131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/****************************************************************************
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* sched/group/group_suspendchildren.c
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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_suspendchildren_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_suspendchildren_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 = sched_gettcb(pid);
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if (rtcb != NULL)
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{
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sched_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_suspendchildren
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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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* SIGSTP/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_suspendchildren(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_suspendchildren_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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