Add logic to send SIGCHLD to all members of a task group
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5564 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
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a35fcc5970
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c9752dfb87
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@ -4025,3 +4025,8 @@
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poll_interrupt() must cat call net_lostconnection() when a
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loss of connection is reported. Otherwise, the system will
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not know that the connection has been lost.
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* sched/group_create.c, group_join.c, and group_leave.c: Add
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support for task groups.
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* sched/group_signal.c and task_exithook.c: Send signal to all
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members for the parent task group.
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@ -70,7 +70,7 @@
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/* In any event, we don't need group members if support for pthreads is disabled */
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#ifdef CONFIG_PTHREADS_DISABLE
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#ifdef CONFIG_DISABLE_PTHREAD
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# undef HAVE_GROUP_MEMBERS
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#endif
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@ -87,7 +87,11 @@ SCHED_SRCS += sched_waitid.c sched_wait.c
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endif
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endif
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GRP_SRCS = group_create.c group_join.c group_leave.c
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GRP_SRCS = group_create.c group_join.c group_leave.c
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ifneq ($(CONFIG_DISABLE_SIGNALS),y)
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GRP_SRCS += group_signal.c
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endif
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ENV_SRCS = env_getenvironptr.c env_dup.c env_share.c env_release.c
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ENV_SRCS += env_findvar.c env_removevar.c
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@ -0,0 +1,135 @@
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/*****************************************************************************
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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 <debug.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 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_signal(FAR _TCB *tcb, FAR siginfo_t *info)
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{
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#ifdef HAVE_GROUP_MEMBERS
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FAR struct task_group_s *group;
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FAR _TCB *gtcb;
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int i;
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DEBUGASSERT(tcb && tcb->group && info);
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group = tcb->group;
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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 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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@ -275,13 +275,21 @@ int task_reparent(pid_t ppid, pid_t chpid);
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#ifdef HAVE_TASK_GROUP
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int group_allocate(FAR _TCB *tcb);
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int group_initialize(FAR _TCB *tcb);
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int group_bind(FAR _TCB *tcb);
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int group_join(FAR _TCB *tcb);
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void group_leave(FAR _TCB *tcb);
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#ifndef CONFIG_DISABLE_SIGNALS
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int group_signal(FAR _TCB *tcb, FAR siginfo_t *info);
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#else
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# define group_allocate(tcb) (0)
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# define group_initialize(tcb) (0)
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# define group_join(tcb) (0)
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# define group_signal(tcb,info) (0)
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#endif
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#else
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# define group_allocate(tcb) (0)
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# define group_initialize(tcb) (0)
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# define group_bind(tcb) (0)
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# define group_join(tcb) (0)
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# define group_leave(tcb)
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# define group_signal(tcb,info) (0)
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#endif
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#ifdef CONFIG_SCHED_CHILD_STATUS
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@ -259,7 +259,11 @@ static inline void task_sigchild(FAR _TCB *ptcb, FAR _TCB *ctcb, int status)
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* can provide the correct si_code value with the signal.
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*/
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#ifdef HAVE_GROUP_MEMBERS
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(void)group_signal(ptcb, &info);
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#else
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(void)sig_received(ptcb, &info);
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#endif
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}
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}
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#else
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