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/************************************************************************
* sched/signal/sig_unmaskpendingsignal.c
*
* Copyright (C) 2007, 2009, 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#include <sched.h>
#include "sched/sched.h"
#include "signal/signal.h"
/************************************************************************
* Definitions
************************************************************************/
/************************************************************************
* Private Type Declarations
************************************************************************/
/************************************************************************
* Global Variables
************************************************************************/
/************************************************************************
* Private Variables
************************************************************************/
/************************************************************************
* Private Function Prototypes
************************************************************************/
/************************************************************************
* Public Functions
************************************************************************/
/************************************************************************
* Name: sig_unmaskpendingsignal
*
* 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 sig_unmaskpendingsignal(void)
{
FAR struct tcb_s *rtcb = (FAR struct tcb_s*)g_readytorun.head;
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) & sig_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 = sig_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 = sig_removependingsignal(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.
*/
sig_tcbdispatch(rtcb, &pendingsig->info);
/* Then remove it from the pending signal list */
sig_releasependingsignal(pendingsig);
}
}
}
sched_unlock();
}
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