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/****************************************************************************
* sched/group_killchildren.c
*
* Copyright (C) 2013 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 <sched.h>
#include "group_internal.h"
#if HAVE_GROUP_MEMBERS
/****************************************************************************
* Private Functions
****************************************************************************/
/*****************************************************************************
* Name: group_killchildren_handler
*
* Description:
* Callback from group_foreachchild that handles one member of the group.
*
* Parameters:
* pid - The ID of the group member that may be signalled.
* arg - The PID of the thread to be retained.
*
* Return Value:
* 0 (OK) on success; a negated errno value on failure.
*
*****************************************************************************/
static int group_killchildren_handler(pid_t pid, FAR void *arg)
{
int ret = OK;
/* Is this the pthread that we are looking for? */
if (pid != (pid_t)((uintptr_t)arg))
{
/* Yes.. cancel it */
ret = pthread_cancel(pid);
}
return ret;
}
/****************************************************************************
* 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. When the main task is restarted,
* all of its child pthreads must be terminated.
*
* Parameters:
* tcb - TCB of the task to be retained.
*
* Return Value:
* None
*
* Assumptions:
*
****************************************************************************/
int group_killchildren(FAR struct task_tcb_s *tcb)
{
return group_foreachchild(tcb->cmn.group, group_killchildren_handler,
(FAR void *)((uintptr_t)tcb->cmn.pid));
}
#endif /* HAVE_GROUP_MEMBERS */
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