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