Browse Source
git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5376 42af7a65-404d-4744-a932-0658087f49c3sbg
patacongo
12 years ago
5 changed files with 152 additions and 3 deletions
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/****************************************************************************
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* sched/pause.c |
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* |
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* Copyright (C) 2012 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 <unistd.h> |
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#include <signal.h> |
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/****************************************************************************
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* Preprocessor Definitions |
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****************************************************************************/ |
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/****************************************************************************
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* Private Type Definitions |
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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: pause |
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* |
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* Description: |
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* The pause() function will suspend the calling thread until delivery of a |
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* non-blocked signal. |
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* |
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* Input Parameters: |
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* None |
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* |
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* Returned Value: |
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* Since pause() suspends thread execution indefinitely unless interrupted
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* a signal, there is no successful completion return value. A value of -1 |
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* will always be returned and errno set to indicate the error (EINTR). |
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* |
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* POSIX compatibility: |
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* In the POSIX description of this function is the pause() function will |
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* suspend the calling thread until delivery of a signal whose action is |
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* either to execute a signal-catching function or to terminate the |
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* process. This implementation only waits for any non-blocked signal |
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* to be recieved. |
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* |
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****************************************************************************/ |
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int pause(void) |
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{ |
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sigset_t set; |
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struct siginfo value; |
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/* Set up for the sleep. Using the empty set means that we are not
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* waiting for any particualar signal. However, any unmasked signal |
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* can still awaken sigtimedwait(). |
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*/ |
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(void)sigemptyset(&set); |
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/* sigtwaitinfo() cannot succeed. It should always return error EINTR
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* meaning that some unblocked signal was caught. |
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*/ |
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return sigwaitinfo(&set, &value); |
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} |
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