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Diffstat (limited to 'nuttx/sched/sig_suspend.c')
| -rw-r--r-- | nuttx/sched/sig_suspend.c | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/nuttx/sched/sig_suspend.c b/nuttx/sched/sig_suspend.c deleted file mode 100644 index 09f47dee9..000000000 --- a/nuttx/sched/sig_suspend.c +++ /dev/null @@ -1,180 +0,0 @@ -/**************************************************************************** - * sched/sig_suspend.c - * - * Copyright (C) 2007-2009 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 <signal.h> -#include <assert.h> -#include <debug.h> -#include <sched.h> - -#include <nuttx/arch.h> - -#include "os_internal.h" -#include "sig_internal.h" - -/**************************************************************************** - * Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Type Declarations - ****************************************************************************/ - -/**************************************************************************** - * Global Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: sigsuspend - * - * Description: - * - * The sigsuspend() function replaces the signal mask of the task with the - * set of signals pointed to by the argument 'set' and then suspends the - * process until delivery of a signal to the task. - * - * If the effect of the set argument is to unblock a pending signal, then - * no wait is performed. - * - * The original signal mask is restored when this function returns. - * - * Waiting for an empty signal set stops a task without freeing any - * resources. - * - * Parameters: - * set - signal mask to use while suspended. - * - * Return Value: - * -1 (ERROR) always - * - * Assumptions: - * - * POSIX Compatibility: - * int sigsuspend(const sigset_t *set); - * - * POSIX states that sigsuspend() "suspends the process until delivery of - * a signal whose action is either to execute a signal-catching function - * or to terminate the process." Only the deliver of a signal is required - * in the present implementation (even if the signal is ignored). - * - ****************************************************************************/ - -int sigsuspend(FAR const sigset_t *set) -{ - FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head; - sigset_t intersection; - sigset_t saved_sigprocmask; - FAR sigpendq_t *sigpend; - irqstate_t saved_state; - int unblocksigno; - - /* Several operations must be performed below: We must determine if any - * signal is pending and, if not, wait for the signal. Since signals can - * be posted from the interrupt level, there is a race condition that - * can only be eliminated by disabling interrupts! - */ - - sched_lock(); /* Not necessary */ - saved_state = irqsave(); - - /* Check if there is a pending signal corresponding to one of the - * signals that will be unblocked by the new sigprocmask. - */ - - intersection = ~(*set) & sig_pendingset(rtcb); - if (intersection != NULL_SIGNAL_SET) - { - /* One or more of the signals in intersections is sufficient to cause - * us to not wait. Pick the lowest numbered signal and mark it not - * pending. - */ - - unblocksigno = sig_lowest(&intersection); - sigpend = sig_removependingsignal(rtcb, unblocksigno); - if (!sigpend) - { - PANIC(OSERR_FAILEDTOREMOVESIGNAL); - } - - sig_releasependingsignal(sigpend); - irqrestore(saved_state); - } - else - { - /* Its time to wait. Save a copy of the old sigprocmask and install - * the new (temporary) sigprocmask - */ - - saved_sigprocmask = rtcb->sigprocmask; - rtcb->sigprocmask = *set; - rtcb->sigwaitmask = NULL_SIGNAL_SET; - - /* And wait until one of the unblocked signals is posted */ - - up_block_task(rtcb, TSTATE_WAIT_SIG); - - /* We are running again, restore the original sigprocmask */ - - rtcb->sigprocmask = saved_sigprocmask; - irqrestore(saved_state); - - /* Now, handle the (rare?) case where (a) a blocked signal was received - * while the task was suspended but (b) restoring the original - * sigprocmask will unblock the signal. - */ - - sig_unmaskpendingsignal(); - } - - sched_unlock(); - return ERROR; -} |