forked from Archive/PX4-Autopilot
164 lines
5.3 KiB
C
164 lines
5.3 KiB
C
/*****************************************************************************
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* sched/group_signal.c
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*
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* Copyright (C) 2013 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 <sched.h>
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#include <assert.h>
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#include <signal.h>
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#include <errno.h>
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#include <debug.h>
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#include "os_internal.h"
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#include "group_internal.h"
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#include "sig_internal.h"
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#if defined(HAVE_TASK_GROUP) && !defined(CONFIG_DISABLE_SIGNALS)
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/*****************************************************************************
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* Pre-processor Definitions
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*****************************************************************************/
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/*****************************************************************************
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* Private Types
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*****************************************************************************/
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/*****************************************************************************
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* Private Data
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*****************************************************************************/
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/*****************************************************************************
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* Private Functions
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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_signal
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*
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* Description:
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* Send a signal to every member of the group.
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*
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* Parameters:
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* group - The task group that needs to be signalled.
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*
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* Return Value:
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* 0 (OK) on success; a negated errno value on failure.
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*
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* Assumptions:
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* Called during task terminatino in a safe context. No special precautions
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* are required here.
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*
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*****************************************************************************/
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int group_signal(FAR struct task_group_s *group, FAR siginfo_t *info)
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{
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#ifdef HAVE_GROUP_MEMBERS
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FAR _TCB *gtcb;
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int i;
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DEBUGASSERT(group && info);
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/* Make sure that pre-emption is disabled to that we signal all of teh
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* members of the group before any of them actually run.
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*/
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sched_lock();
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/* Send the signal to each member of the group */
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for (i = 0; i < group->tg_nmembers; i++)
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{
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gtcb = sched_gettcb(group->tg_members[i]);
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DEBUGASSERT(gtcb);
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if (gtcb)
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{
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/* Use the sig_received interface so that it does not muck with
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* the siginfo_t.
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*/
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#ifdef CONFIG_DEBUG
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int ret = sig_received(gtcb, info);
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DEBUGASSERT(ret == 0);
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#else
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(void)sig_received(gtcb, info);
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#endif
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}
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}
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/* Re-enable pre-emption an return success */
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sched_unlock();
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return OK;
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#else
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return -ENOSYS;
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#endif
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}
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/*****************************************************************************
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* Name: group_signalmember
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*
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* Description:
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* Send a signal to every member of the group to which task belongs.
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*
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* Parameters:
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* tcb - The tcb of one task in the task group that needs to be signalled.
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*
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* Return Value:
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* 0 (OK) on success; a negated errno value on failure.
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*
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* Assumptions:
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* Called during task terminatino in a safe context. No special precautions
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* are required here.
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*
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*****************************************************************************/
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int group_signalmember(FAR _TCB *tcb, FAR siginfo_t *info)
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{
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#ifdef HAVE_GROUP_MEMBERS
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DEBUGASSERT(tcb);
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return group_signal(tcb->group, info);
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#else
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return sig_received(tcb, info);
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#endif
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}
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#endif /* HAVE_TASK_GROUP && !CONFIG_DISABLE_SIGNALS */
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