144 lines
5.4 KiB
C
144 lines
5.4 KiB
C
/************************************************************************
|
|
* 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"
|
|
|
|
/************************************************************************
|
|
* Pre-processor 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();
|
|
}
|
|
|