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- /****************************************************************************
- * sched/group/group_killchildren.c
- *
- * Copyright (C) 2013, 2018 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * 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_killchildren_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 signaled.
- * arg - The PID of the thread to be retained.
- *
- * Returned Value:
- * 0 (OK) always
- *
- ****************************************************************************/
- static int group_killchildren_handler(pid_t pid, FAR void *arg)
- {
- FAR struct tcb_s *rtcb;
- int ret;
- /* Cancel all threads except for the one specified by the argument */
- if (pid != (pid_t)((uintptr_t)arg))
- {
- /* Cancel this thread. This is a forced cancellation. Make sure that
- * cancellation is not disabled by the task/thread. That bit will
- * prevent pthread_cancel() or task_delete() from doing what they need
- * to do.
- */
- rtcb = sched_gettcb(pid);
- if (rtcb != NULL)
- {
- /* This is a forced cancellation. Make sure that cancellation is
- * not disabled by the task/thread. That bit would prevent
- * pthread_cancel() or task_delete() from doing what they need
- * to do.
- */
- rtcb->flags &= ~TCB_FLAG_NONCANCELABLE;
- /* 'pid' could refer to the main task of the thread. That pid
- * will appear in the group member list as well!
- */
- if ((rtcb->flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_PTHREAD)
- {
- ret = pthread_cancel(pid);
- }
- else
- {
- ret = task_delete(pid);
- }
- if (ret < 0)
- {
- serr("ERROR: Failed to kill %d: %d\n", ret, pid);
- }
- }
- }
- /* Always return zero. We need to visit each member of the group*/
- return OK;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: group_killchildren
- *
- * Description:
- * Delete all children of a task except for the specified task. This is
- * used by the task restart logic and by the default signal handling
- * abnormal termination logic. When the main task is restarted or killed,
- * all of its child pthreads must be terminated.
- *
- * Input Parameters:
- * tcb - TCB of the task to be retained.
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- int group_killchildren(FAR struct task_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->cmn.group, group_killchildren_handler,
- (FAR void *)((uintptr_t)tcb->cmn.pid));
- sched_unlock();
- return ret;
- }
- #endif /* HAVE_GROUP_MEMBERS */
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