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138 lines
5.1 KiB
138 lines
5.1 KiB
/************************************************************************ |
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* sched/sig_unmaskpendingsignal.c |
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* |
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* Copyright (C) 2007, 2009 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 "os_internal.h" |
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#include "sig_internal.h" |
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/************************************************************************ |
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* Definitions |
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************************************************************************/ |
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/************************************************************************ |
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* Private Type Declarations |
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************************************************************************/ |
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/************************************************************************ |
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* Global Variables |
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************************************************************************/ |
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/************************************************************************ |
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* Private Variables |
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************************************************************************/ |
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/************************************************************************ |
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* Private Function Prototypes |
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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: sig_unmaskpendingsignal |
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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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void sig_unmaskpendingsignal(void) |
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{ |
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FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head; |
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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) & sig_pendingset(rtcb); |
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/* Loop while there are unmasked pending signals to be processed. */ |
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while (unmaskedset != NULL_SIGNAL_SET) |
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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 = sig_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 = sig_removependingsignal(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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sig_received(rtcb, &pendingsig->info); |
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/* Then remove it from the pending signal list */ |
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sig_releasependingsignal(pendingsig); |
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} |
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} |
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} |
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sched_unlock(); |
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} |
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