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/*****************************************************************************
* sched/group_signal.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 <assert.h>
#include <signal.h>
#include <debug.h>
#include "os_internal.h"
#include "group_internal.h"
#include "sig_internal.h"
#if defined(HAVE_TASK_GROUP) && !defined(CONFIG_DISABLE_SIGNALS)
/*****************************************************************************
* Pre-processor Definitions
*****************************************************************************/
/*****************************************************************************
* Private Types
*****************************************************************************/
/*****************************************************************************
* Private Data
*****************************************************************************/
/*****************************************************************************
* Private Functions
*****************************************************************************/
/*****************************************************************************
* Public Functions
*****************************************************************************/
/*****************************************************************************
* Name: group_signal
*
* Description:
* Send a signal to every member of the group to which task belongs.
*
* Parameters:
* tcb - The tcb of one task in the task group that needs to be signalled.
*
* Return Value:
* 0 (OK) on success; a negated errno value on failure.
*
* Assumptions:
* Called during task terminatino in a safe context. No special precautions
* are required here.
*
*****************************************************************************/
int group_signal(FAR _TCB *tcb, FAR siginfo_t *info)
{
#ifdef HAVE_GROUP_MEMBERS
FAR struct task_group_s *group;
FAR _TCB *gtcb;
int i;
DEBUGASSERT(tcb && tcb->group && info);
group = tcb->group;
/* Make sure that pre-emption is disabled to that we signal all of teh
* members of the group before any of them actually run.
*/
sched_lock();
/* Send the signal to each member of the group */
for (i = 0; i < group->tg_nmembers; i++)
{
gtcb = sched_gettcb(group->tg_members[i]);
DEBUGASSERT(gtcb);
if (gtcb)
{
/* Use the sig_received interface so that it does not muck with
* the siginfo_t.
*/
#ifdef CONFIG_DEBUG
int ret = sig_received(gtcb, info);
DEBUGASSERT(ret == 0);
#else
(void)sig_received(gtcb, info);
#endif
}
}
/* Re-enable pre-emption an return success */
sched_unlock();
return OK;
#else
return sig_received(tcb, info);
#endif
}
#endif /* HAVE_TASK_GROUP && !CONFIG_DISABLE_SIGNALS */
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