118 lines
3.9 KiB
C
118 lines
3.9 KiB
C
/****************************************************************************
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* sched/signal/sig_unmaskpendingsignal.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <nuttx/signal.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 = nxsig_pendingset(rtcb);
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nxsig_nandset(&unmaskedset, &unmaskedset, &rtcb->sigprocmask);
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if (sigisemptyset(&unmaskedset))
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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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nxsig_delset(&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 (!sigisemptyset(&unmaskedset));
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sched_unlock();
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return true;
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}
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