8198ba6a6d
This is analogous to similar renaming that was done previously for semaphores.
Squashed commit of the following:
sched/signal: Fix a few compile warnings introduced by naming changes.
sched/signal: Rename all private, internal signl functions to use the nxsig_ prefix.
sched/signal: Rename sig_removependingsignal, sig_unmaskpendingsignal, and sig_mqnotempty to nxsig_remove_pendingsignal, nxsig_unmask_pendingsignal, and nxsig_mqnotempty to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_findaction and sig_lowest to nxsig_find_action and nxsig_lowest to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_allocatepingsigaction and sig_deliver to nxsig_alloc_pendingsigaction and nxsig_deliver to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_cleanup, sig_release, sig_releasependingaction, and sig_releasependingsignal to nxsig_cleanup, nxsig_release, nxsig_release_pendingaction, and nxsig_release_pendingsignal to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_tcbdispatch and sig_dispatch to nxsig_tcbdispatch and nxsig_dispatch to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_releaseaction and sig_pendingset to nxsig_release_action and nxsig_pendingset to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_initialize and sig_allocateactionblock to nxsig_initialize and nxsig_alloc_actionblock to make it clear that these are OS internal interfaces.
165 lines
5.6 KiB
C
165 lines
5.6 KiB
C
/****************************************************************************
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* sched/signal/sig_suspend.c
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*
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* Copyright (C) 2007-2009, 2013, 2016 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 <signal.h>
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#include <assert.h>
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#include <debug.h>
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#include <sched.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/cancelpt.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: sigsuspend
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*
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* Description:
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*
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* The sigsuspend() function replaces the signal mask of the task with the
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* set of signals pointed to by the argument 'set' and then suspends the
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* process until delivery of a signal to the task.
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*
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* If the effect of the set argument is to unblock a pending signal, then
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* no wait is performed.
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*
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* The original signal mask is restored when this function returns.
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*
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* Waiting for an empty signal set stops a task without freeing any
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* resources.
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*
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* Parameters:
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* set - signal mask to use while suspended.
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*
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* Return Value:
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* -1 (ERROR) always
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*
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* Assumptions:
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*
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* POSIX Compatibility:
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* int sigsuspend(const sigset_t *set);
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*
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* POSIX states that sigsuspend() "suspends the process until delivery of
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* a signal whose action is either to execute a signal-catching function
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* or to terminate the process." Only the deliver of a signal is required
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* in the present implementation (even if the signal is ignored).
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*
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****************************************************************************/
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int sigsuspend(FAR const sigset_t *set)
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{
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FAR struct tcb_s *rtcb = this_task();
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sigset_t intersection;
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sigset_t saved_sigprocmask;
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FAR sigpendq_t *sigpend;
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irqstate_t flags;
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int unblocksigno;
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/* sigsuspend() is a cancellation point */
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(void)enter_cancellation_point();
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/* Several operations must be performed below: We must determine if any
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* signal is pending and, if not, wait for the signal. Since signals can
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* be posted from the interrupt level, there is a race condition that
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* can only be eliminated by disabling interrupts!
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*/
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sched_lock(); /* Not necessary */
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flags = enter_critical_section();
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/* Check if there is a pending signal corresponding to one of the
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* signals that will be unblocked by the new sigprocmask.
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*/
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intersection = ~(*set) & nxsig_pendingset(rtcb);
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if (intersection != NULL_SIGNAL_SET)
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{
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/* One or more of the signals in intersections is sufficient to cause
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* us to not wait. Pick the lowest numbered signal and mark it not
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* pending.
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*/
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unblocksigno = nxsig_lowest(&intersection);
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sigpend = nxsig_remove_pendingsignal(rtcb, unblocksigno);
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ASSERT(sigpend);
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nxsig_release_pendingsignal(sigpend);
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leave_critical_section(flags);
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}
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else
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{
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/* Its time to wait. Save a copy of the old sigprocmask and install
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* the new (temporary) sigprocmask
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*/
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saved_sigprocmask = rtcb->sigprocmask;
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rtcb->sigprocmask = *set;
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rtcb->sigwaitmask = NULL_SIGNAL_SET;
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/* And wait until one of the unblocked signals is posted */
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up_block_task(rtcb, TSTATE_WAIT_SIG);
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/* We are running again, restore the original sigprocmask */
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rtcb->sigprocmask = saved_sigprocmask;
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leave_critical_section(flags);
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/* Now, handle the (rare?) case where (a) a blocked signal was received
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* while the task was suspended but (b) restoring the original
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* sigprocmask will unblock the signal.
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*/
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nxsig_unmask_pendingsignal();
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}
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sched_unlock();
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leave_cancellation_point();
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return ERROR; /* ??REVISIT: Always returns ERROR?? */
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}
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