2015-10-03 15:25:53 +02:00
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/****************************************************************************
|
2014-08-08 22:06:42 +02:00
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|
|
* sched/group/group_signal.c
|
2013-01-25 21:00:37 +01:00
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|
*
|
2016-02-18 15:34:11 +01:00
|
|
|
* Copyright (C) 2013, 2016 Gregory Nutt. All rights reserved.
|
2013-01-25 21:00:37 +01:00
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|
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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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*
|
2015-10-03 15:25:53 +02:00
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|
****************************************************************************/
|
2013-01-25 21:00:37 +01:00
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2015-10-03 15:25:53 +02:00
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/****************************************************************************
|
2013-01-25 21:00:37 +01:00
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|
* Included Files
|
2015-10-03 15:25:53 +02:00
|
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|
****************************************************************************/
|
2013-01-25 21:00:37 +01:00
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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>
|
2013-01-26 18:28:20 +01:00
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#include <errno.h>
|
2013-01-25 21:00:37 +01:00
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#include <debug.h>
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2014-08-09 01:53:55 +02:00
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#include "sched/sched.h"
|
2014-08-08 22:06:42 +02:00
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#include "group/group.h"
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2014-08-08 20:44:44 +02:00
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#include "signal/signal.h"
|
2013-01-25 21:00:37 +01:00
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#if defined(HAVE_TASK_GROUP) && !defined(CONFIG_DISABLE_SIGNALS)
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2015-10-03 15:25:53 +02:00
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|
/****************************************************************************
|
2013-01-25 21:00:37 +01:00
|
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* Private Types
|
2015-10-03 15:25:53 +02:00
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****************************************************************************/
|
2013-01-25 21:00:37 +01:00
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2013-02-06 16:43:28 +01:00
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#ifdef HAVE_GROUP_MEMBERS
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struct group_signal_s
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|
|
|
{
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FAR siginfo_t *siginfo; /* Signal to be dispatched */
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FAR struct tcb_s *dtcb; /* Default, valid TCB */
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FAR struct tcb_s *utcb; /* TCB with this signal unblocked */
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FAR struct tcb_s *atcb; /* This TCB was awakened */
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FAR struct tcb_s *ptcb; /* This TCB received the signal */
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};
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#endif
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2015-10-03 15:25:53 +02:00
|
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|
/****************************************************************************
|
2013-01-25 21:00:37 +01:00
|
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|
* Private Functions
|
2015-10-03 15:25:53 +02:00
|
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****************************************************************************/
|
2013-01-25 21:00:37 +01:00
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2015-10-03 15:25:53 +02:00
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/****************************************************************************
|
2013-02-06 16:43:28 +01:00
|
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|
* Name: group_signal_handler
|
2013-01-25 21:00:37 +01:00
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|
*
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|
|
* Description:
|
2013-02-06 16:43:28 +01:00
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* Callback from group_foreachchild that handles one member of the group.
|
2013-01-25 21:00:37 +01:00
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|
*
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|
|
* Parameters:
|
2013-02-06 16:43:28 +01:00
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* pid - The ID of the group member that may be signalled.
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|
* arg - A pointer to a struct group_signal_s instance.
|
2013-01-25 21:00:37 +01:00
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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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*
|
2015-10-03 15:25:53 +02:00
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****************************************************************************/
|
2013-01-25 21:00:37 +01:00
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#ifdef HAVE_GROUP_MEMBERS
|
2013-02-06 16:43:28 +01:00
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static int group_signal_handler(pid_t pid, FAR void *arg)
|
|
|
|
{
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FAR struct group_signal_s *info = (FAR struct group_signal_s *)arg;
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|
FAR struct tcb_s *tcb;
|
2013-02-05 20:50:37 +01:00
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|
FAR sigactq_t *sigact;
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|
int ret;
|
2013-01-25 21:00:37 +01:00
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|
2013-02-06 16:43:28 +01:00
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/* Get the TCB associated with the group member */
|
2013-01-25 21:00:37 +01:00
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|
|
2013-02-06 16:43:28 +01:00
|
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|
tcb = sched_gettcb(pid);
|
2016-12-04 13:52:08 +01:00
|
|
|
DEBUGASSERT(tcb != NULL && tcb->group != NULL && info != NULL);
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|
|
2013-02-06 16:43:28 +01:00
|
|
|
if (tcb)
|
|
|
|
{
|
|
|
|
/* Set this one as the default if we have not already set the default. */
|
2013-01-25 21:00:37 +01:00
|
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|
2013-02-06 16:43:28 +01:00
|
|
|
if (!info->dtcb)
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|
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|
{
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info->dtcb = tcb;
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|
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|
}
|
2013-01-25 21:00:37 +01:00
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2013-02-06 16:43:28 +01:00
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/* Is the thread waiting for this signal (in this case, the signal is
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|
* probably blocked).
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*/
|
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|
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if (sigismember(&tcb->sigwaitmask, info->siginfo->si_signo) && !info->atcb)
|
2013-01-25 21:00:37 +01:00
|
|
|
{
|
2013-02-06 16:43:28 +01:00
|
|
|
/* Yes.. This means that the task is suspended, waiting for this
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|
|
|
* signal to occur. Stop looking and use this TCB. The
|
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|
|
* requirement is this: If a task group receives a signal and
|
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|
|
* more than one thread is waiting on that signal, then one and
|
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|
|
* only one indeterminate thread out of that waiting group will
|
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|
|
* receive the signal.
|
2013-01-25 21:00:37 +01:00
|
|
|
*/
|
|
|
|
|
This change renames all internal, private NuttX signal-related functions to use the prefix nxsig_ so that they cannot be confused with application interfaces that begin, primarily, with sig_
This is analogous to similar renaming that was done previously for semaphores.
Squashed commit of the following:
sched/signal: Fix a few compile warnings introduced by naming changes.
sched/signal: Rename all private, internal signl functions to use the nxsig_ prefix.
sched/signal: Rename sig_removependingsignal, sig_unmaskpendingsignal, and sig_mqnotempty to nxsig_remove_pendingsignal, nxsig_unmask_pendingsignal, and nxsig_mqnotempty to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_findaction and sig_lowest to nxsig_find_action and nxsig_lowest to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_allocatepingsigaction and sig_deliver to nxsig_alloc_pendingsigaction and nxsig_deliver to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_cleanup, sig_release, sig_releasependingaction, and sig_releasependingsignal to nxsig_cleanup, nxsig_release, nxsig_release_pendingaction, and nxsig_release_pendingsignal to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_tcbdispatch and sig_dispatch to nxsig_tcbdispatch and nxsig_dispatch to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_releaseaction and sig_pendingset to nxsig_release_action and nxsig_pendingset to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_initialize and sig_allocateactionblock to nxsig_initialize and nxsig_alloc_actionblock to make it clear that these are OS internal interfaces.
2017-10-05 21:25:25 +02:00
|
|
|
ret = nxsig_tcbdispatch(tcb, info->siginfo);
|
2013-02-06 16:43:28 +01:00
|
|
|
if (ret < 0)
|
2013-02-05 20:50:37 +01:00
|
|
|
{
|
2013-02-06 16:43:28 +01:00
|
|
|
return ret;
|
2013-02-05 20:50:37 +01:00
|
|
|
}
|
|
|
|
|
2013-02-06 16:43:28 +01:00
|
|
|
/* Limit to one thread */
|
2013-02-05 20:50:37 +01:00
|
|
|
|
2013-02-06 16:43:28 +01:00
|
|
|
info->atcb = tcb;
|
2016-05-12 01:42:59 +02:00
|
|
|
if (info->ptcb != NULL)
|
2013-02-05 20:50:37 +01:00
|
|
|
{
|
2013-02-06 16:43:28 +01:00
|
|
|
return 1; /* Terminate the search */
|
|
|
|
}
|
|
|
|
}
|
2013-02-05 20:50:37 +01:00
|
|
|
|
2013-02-06 16:43:28 +01:00
|
|
|
/* Is this signal unblocked on this thread? */
|
2013-02-05 20:50:37 +01:00
|
|
|
|
2013-02-06 16:43:28 +01:00
|
|
|
if (!sigismember(&tcb->sigprocmask, info->siginfo->si_signo) &&
|
|
|
|
!info->ptcb && tcb != info->atcb)
|
|
|
|
{
|
|
|
|
/* Yes.. remember this TCB if we have not encountered any
|
|
|
|
* other threads that have the signal unblocked.
|
|
|
|
*/
|
2013-02-05 20:50:37 +01:00
|
|
|
|
2013-02-06 16:43:28 +01:00
|
|
|
if (!info->utcb)
|
|
|
|
{
|
|
|
|
info->utcb = tcb;
|
2013-02-05 20:50:37 +01:00
|
|
|
}
|
|
|
|
|
2016-02-18 15:34:11 +01:00
|
|
|
/* Is there also a action associated with the task group? */
|
2013-02-05 20:50:37 +01:00
|
|
|
|
This change renames all internal, private NuttX signal-related functions to use the prefix nxsig_ so that they cannot be confused with application interfaces that begin, primarily, with sig_
This is analogous to similar renaming that was done previously for semaphores.
Squashed commit of the following:
sched/signal: Fix a few compile warnings introduced by naming changes.
sched/signal: Rename all private, internal signl functions to use the nxsig_ prefix.
sched/signal: Rename sig_removependingsignal, sig_unmaskpendingsignal, and sig_mqnotempty to nxsig_remove_pendingsignal, nxsig_unmask_pendingsignal, and nxsig_mqnotempty to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_findaction and sig_lowest to nxsig_find_action and nxsig_lowest to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_allocatepingsigaction and sig_deliver to nxsig_alloc_pendingsigaction and nxsig_deliver to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_cleanup, sig_release, sig_releasependingaction, and sig_releasependingsignal to nxsig_cleanup, nxsig_release, nxsig_release_pendingaction, and nxsig_release_pendingsignal to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_tcbdispatch and sig_dispatch to nxsig_tcbdispatch and nxsig_dispatch to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_releaseaction and sig_pendingset to nxsig_release_action and nxsig_pendingset to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_initialize and sig_allocateactionblock to nxsig_initialize and nxsig_alloc_actionblock to make it clear that these are OS internal interfaces.
2017-10-05 21:25:25 +02:00
|
|
|
sigact = nxsig_find_action(tcb->group, info->siginfo->si_signo);
|
2013-02-06 16:43:28 +01:00
|
|
|
if (sigact)
|
2013-02-05 20:50:37 +01:00
|
|
|
{
|
2013-02-06 16:43:28 +01:00
|
|
|
/* Yes.. then use this thread. The requirement is this:
|
|
|
|
* If a task group receives a signal then one and only one
|
|
|
|
* indeterminate thread in the task group which is not
|
|
|
|
* blocking the signal will receive the signal.
|
2013-02-05 20:50:37 +01:00
|
|
|
*/
|
|
|
|
|
This change renames all internal, private NuttX signal-related functions to use the prefix nxsig_ so that they cannot be confused with application interfaces that begin, primarily, with sig_
This is analogous to similar renaming that was done previously for semaphores.
Squashed commit of the following:
sched/signal: Fix a few compile warnings introduced by naming changes.
sched/signal: Rename all private, internal signl functions to use the nxsig_ prefix.
sched/signal: Rename sig_removependingsignal, sig_unmaskpendingsignal, and sig_mqnotempty to nxsig_remove_pendingsignal, nxsig_unmask_pendingsignal, and nxsig_mqnotempty to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_findaction and sig_lowest to nxsig_find_action and nxsig_lowest to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_allocatepingsigaction and sig_deliver to nxsig_alloc_pendingsigaction and nxsig_deliver to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_cleanup, sig_release, sig_releasependingaction, and sig_releasependingsignal to nxsig_cleanup, nxsig_release, nxsig_release_pendingaction, and nxsig_release_pendingsignal to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_tcbdispatch and sig_dispatch to nxsig_tcbdispatch and nxsig_dispatch to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_releaseaction and sig_pendingset to nxsig_release_action and nxsig_pendingset to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_initialize and sig_allocateactionblock to nxsig_initialize and nxsig_alloc_actionblock to make it clear that these are OS internal interfaces.
2017-10-05 21:25:25 +02:00
|
|
|
ret = nxsig_tcbdispatch(tcb, info->siginfo);
|
2013-02-06 16:43:28 +01:00
|
|
|
if (ret < 0)
|
2013-02-05 20:50:37 +01:00
|
|
|
{
|
2013-02-06 16:43:28 +01:00
|
|
|
return ret;
|
2013-02-05 20:50:37 +01:00
|
|
|
}
|
|
|
|
|
2013-02-06 16:43:28 +01:00
|
|
|
/* Limit to one thread */
|
2013-02-05 20:50:37 +01:00
|
|
|
|
2013-02-06 16:43:28 +01:00
|
|
|
info->ptcb = tcb;
|
|
|
|
if (info->atcb != NULL)
|
2013-02-05 20:50:37 +01:00
|
|
|
{
|
2013-02-06 16:43:28 +01:00
|
|
|
return 1; /* Terminate the search */
|
2013-02-05 20:50:37 +01:00
|
|
|
}
|
|
|
|
}
|
2013-01-25 21:00:37 +01:00
|
|
|
}
|
|
|
|
}
|
2013-02-05 20:50:37 +01:00
|
|
|
|
2013-02-06 16:43:28 +01:00
|
|
|
return 0; /* Keep searching */
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2015-10-03 15:25:53 +02:00
|
|
|
/****************************************************************************
|
2013-02-06 16:43:28 +01:00
|
|
|
* Public Functions
|
2015-10-03 15:25:53 +02:00
|
|
|
****************************************************************************/
|
2013-02-06 16:43:28 +01:00
|
|
|
|
2015-10-03 15:25:53 +02:00
|
|
|
/****************************************************************************
|
2013-02-06 16:43:28 +01:00
|
|
|
* Name: group_signal
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Send a signal to every member of the group.
|
|
|
|
*
|
|
|
|
* Parameters:
|
|
|
|
* group - The task group that needs to be signalled.
|
|
|
|
*
|
|
|
|
* Return Value:
|
|
|
|
* 0 (OK) on success; a negated errno value on failure.
|
|
|
|
*
|
|
|
|
* Assumptions:
|
|
|
|
* Called during task termination in a safe context. No special precautions
|
|
|
|
* are required here. Because signals can be sent from interrupt handlers,
|
|
|
|
* this function may be called indirectly in the context of an interrupt
|
|
|
|
* handler.
|
|
|
|
*
|
2015-10-03 15:25:53 +02:00
|
|
|
****************************************************************************/
|
2013-02-06 16:43:28 +01:00
|
|
|
|
|
|
|
int group_signal(FAR struct task_group_s *group, FAR siginfo_t *siginfo)
|
|
|
|
{
|
|
|
|
#ifdef HAVE_GROUP_MEMBERS
|
|
|
|
struct group_signal_s info;
|
|
|
|
FAR struct tcb_s *tcb;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
DEBUGASSERT(group && siginfo);
|
|
|
|
|
|
|
|
info.siginfo = siginfo;
|
|
|
|
info.dtcb = NULL; /* Default, valid TCB */
|
|
|
|
info.utcb = NULL; /* TCB with this signal unblocked */
|
|
|
|
info.atcb = NULL; /* This TCB was awakened */
|
|
|
|
info.ptcb = NULL; /* This TCB received the signal */
|
|
|
|
|
|
|
|
/* Make sure that pre-emption is disabled to that we signal all of the
|
|
|
|
* members of the group before any of them actually run. (This does
|
|
|
|
* nothing if were were called from an interrupt handler).
|
|
|
|
*/
|
|
|
|
|
|
|
|
sched_lock();
|
|
|
|
|
|
|
|
/* Now visit each member of the group and perform signal handling checks. */
|
|
|
|
|
|
|
|
ret = group_foreachchild(group, group_signal_handler, &info);
|
|
|
|
if (ret < 0)
|
|
|
|
{
|
|
|
|
goto errout;
|
|
|
|
}
|
|
|
|
|
2013-02-05 20:50:37 +01:00
|
|
|
/* We need to dispatch the signal in any event (if nothing else so that it
|
|
|
|
* can be added to the pending signal list). If we found a thread with the
|
|
|
|
* signal unblocked, then use that thread.
|
|
|
|
*/
|
|
|
|
|
2013-02-06 16:43:28 +01:00
|
|
|
if (info.atcb == NULL && info.ptcb == NULL)
|
2013-02-05 20:50:37 +01:00
|
|
|
{
|
2013-02-06 16:43:28 +01:00
|
|
|
if (info.utcb)
|
2013-02-05 20:50:37 +01:00
|
|
|
{
|
2013-02-06 16:43:28 +01:00
|
|
|
tcb = info.utcb;
|
2013-02-05 20:50:37 +01:00
|
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}
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/* Otherwise use the default TCB. There should always be a default
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* TCB. It will have the signal blocked, but can be used to get the
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* signal to a pending state.
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*/
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2013-02-06 16:43:28 +01:00
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else /* if (info.dtcb) */
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2013-02-05 20:50:37 +01:00
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{
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2013-02-06 16:43:28 +01:00
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DEBUGASSERT(info.dtcb);
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tcb = info.dtcb;
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2013-02-05 20:50:37 +01:00
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}
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/* Now deliver the signal to the selected group member */
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This change renames all internal, private NuttX signal-related functions to use the prefix nxsig_ so that they cannot be confused with application interfaces that begin, primarily, with sig_
This is analogous to similar renaming that was done previously for semaphores.
Squashed commit of the following:
sched/signal: Fix a few compile warnings introduced by naming changes.
sched/signal: Rename all private, internal signl functions to use the nxsig_ prefix.
sched/signal: Rename sig_removependingsignal, sig_unmaskpendingsignal, and sig_mqnotempty to nxsig_remove_pendingsignal, nxsig_unmask_pendingsignal, and nxsig_mqnotempty to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_findaction and sig_lowest to nxsig_find_action and nxsig_lowest to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_allocatepingsigaction and sig_deliver to nxsig_alloc_pendingsigaction and nxsig_deliver to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_cleanup, sig_release, sig_releasependingaction, and sig_releasependingsignal to nxsig_cleanup, nxsig_release, nxsig_release_pendingaction, and nxsig_release_pendingsignal to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_tcbdispatch and sig_dispatch to nxsig_tcbdispatch and nxsig_dispatch to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_releaseaction and sig_pendingset to nxsig_release_action and nxsig_pendingset to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_initialize and sig_allocateactionblock to nxsig_initialize and nxsig_alloc_actionblock to make it clear that these are OS internal interfaces.
2017-10-05 21:25:25 +02:00
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ret = nxsig_tcbdispatch(tcb, siginfo);
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2013-02-05 20:50:37 +01:00
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}
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errout:
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2013-01-25 21:00:37 +01:00
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sched_unlock();
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2013-02-05 20:50:37 +01:00
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return ret;
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2013-01-25 21:00:37 +01:00
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#else
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2013-02-05 20:50:37 +01:00
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2013-01-26 18:28:20 +01:00
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return -ENOSYS;
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2014-04-13 22:32:20 +02:00
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2013-01-25 21:00:37 +01:00
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#endif
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}
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#endif /* HAVE_TASK_GROUP && !CONFIG_DISABLE_SIGNALS */
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