130 lines
4.6 KiB
C
130 lines
4.6 KiB
C
/****************************************************************************
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* sched/signal/sig_unmaskpendingsignal.c
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*
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* Copyright (C) 2007, 2009, 2013, 2017 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 "sched/sched.h"
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#include "signal/signal.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsig_unmask_pendingsignal
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*
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* Description:
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* Based upon the current setting of the sigprocmask, this function
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* unmasks and processes any pending signals. This function should
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* be called whenever the sigprocmask is changed.
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*
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****************************************************************************/
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bool nxsig_unmask_pendingsignal(void)
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{
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FAR struct tcb_s *rtcb = this_task();
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sigset_t unmaskedset;
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FAR sigpendq_t *pendingsig;
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int signo;
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/* Prohibit any context switches until we are done with this.
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* We may still be performing signal operations from interrupt
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* handlers, however, none of the pending signals that we
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* are concerned with here should be effected.
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*/
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sched_lock();
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/* Get the set of pending signals that were just unmasked. The
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* following operation should be safe because the sigprocmask
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* can only be changed on this thread of execution.
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*/
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unmaskedset = ~(rtcb->sigprocmask) & nxsig_pendingset(rtcb);
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if (unmaskedset == NULL_SIGNAL_SET)
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{
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sched_unlock();
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return false;
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}
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/* Loop while there are unmasked pending signals to be processed. */
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do
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{
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/* Pending signals will be processed from lowest numbered signal
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* to highest
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*/
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signo = nxsig_lowest(&unmaskedset);
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if (signo != ERROR)
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{
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/* Remove the signal from the set of unmasked signals. NOTE:
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* this implicitly assumes that only one instance for a given
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* signal number is pending.
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*/
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sigdelset(&unmaskedset, signo);
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/* Remove the pending signal from the list of pending signals */
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if ((pendingsig = nxsig_remove_pendingsignal(rtcb, signo)) != NULL)
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{
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/* If there is one, then process it like a normal signal.
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* Since the signal was pending, then unblocked on this
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* thread, we can skip the normal group signal dispatching
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* rules; there can be no other recipient for the signal
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* other than this thread.
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*/
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nxsig_tcbdispatch(rtcb, &pendingsig->info);
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/* Then remove it from the pending signal list */
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nxsig_release_pendingsignal(pendingsig);
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}
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}
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}
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while (unmaskedset != NULL_SIGNAL_SET);
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sched_unlock();
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return true;
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}
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