289 lines
8.3 KiB
HTML
289 lines
8.3 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>pthread_signal_to_cancel_np()--Convert Signals to Cancel
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Requests</title>
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Begin Header Records ========================================== -->
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<!-- NETMG2 SCRIPT A converted by B2H R4.1 (346) (CMS) by HOLTJM at -->
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<!-- RCHVMW2 on 29 Jan 1999 at 10:01:37 -->
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<!--File Edited November 2001 -->
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<!--End Header Records -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!-- Java sync-link -->
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>pthread_signal_to_cancel_np()--Convert Signals to Cancel Requests</h2>
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<div class="box" style="width: 70%;">
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<br>
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Syntax:
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<pre>
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#include <pthread.h>
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int pthread_signal_to_cancel_np(sigset_t *set, pthread_t *thread);
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</pre>
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Service Program Name: QP0WPTHR<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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Signal Safe: No<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>pthread_signal_to_cancel_np</strong>() function causes a
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<strong>pthread_cancel</strong>() to be delivered to the target thread when the
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first signal specified in set arrives.</p>
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<p>All threads in the process should have the signals specified by <em>set</em>
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blocked from the time of the call to
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<strong>pthread_signal_to_cancel_np</strong>() until the time when the
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<strong>pthread_cancel</strong>() is delivered to the target thread.</p>
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<p>If <strong>pthread_signal_to_cancel_np</strong>() has been called, but a
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signal has not yet been converted to a <strong>pthread_cancel</strong>(), a
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subsequent call to <strong>pthread_signal_to_cancel_np</strong>() overrides the
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first call.</p>
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<p>The <strong>pthread_signal_to_cancel_np</strong>() function creates a
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service thread (called the SignalToCancel thread) to perform the signal to
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cancel conversion. This conversion occurs asynchronously to the thread that
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called <strong>pthread_signal_to_cancel_np</strong>().</p>
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<p>The SignalToCancel thread blocks all signals and performs a
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<strong>sigwait</strong>() on the <em>set</em> of signals specified by set.
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When <strong>sigwait</strong>() returns, indicating that one of the signals in
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set was synchronously received, the SignalToCancel thread calls
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<strong>pthread_cancel</strong>() using the <em>thread</em> specified as the
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target.</p>
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<p>Since the SignalToCancel thread processing occurs asynchronously, the caller
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of <strong>pthread_signal_to_cancel_np</strong>() is not notified of errors
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that may occur during the processing of the SignalToCancel thread. If the
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target thread has terminated or the signals specified by set are not valid, the
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caller of <strong>pthread_signal_to_cancel_np</strong>() is not notified.</p>
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<p><strong>Note:</strong> This function is not portable.</p>
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<br>
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<h3>Authorities and Locks</h3>
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<p>None.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>set</strong></dt>
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<dd>(Input) The set of signals that will be converted to pthread_cancel()
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requests</dd>
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<dt><strong>thread</strong></dt>
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<dd>(Input) The thread that will be canceled when a signal in set arrives</dd>
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</dl>
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<br>
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<h3>Return Value</h3>
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<dl>
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<dt><strong>0</strong></dt>
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<dd><strong>pthread_signal_to_cancel_np</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_signal_to_cancel_np</strong>() was not successful.
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<em>value</em> is set to indicate the error condition.</dd>
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</dl>
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<br>
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<h3>Error Conditions</h3>
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<p>If <strong>pthread_signal_to_cancel_np</strong>() was not successful, the
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error condition returned usually indicates one of the following errors. Under
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some conditions, the value returned could indicate an error other than those
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listed here.</p>
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<dl>
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<dt><em>[EINVAL]</em></dt>
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<dd>
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<p>The value specified for the argument is not correct.</p>
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</dd>
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</dl>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li>The <<strong>pthread.h</strong>> header file. See <a href=
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"rzah4hed.htm">Header files for Pthread functions</a>.<br><br></li>
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<li><a href="users_39.htm">pthread_cancel()</a>--Cancel Thread<br><br></li>
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<li><a href="users_95.htm">pthread_kill()</a>--Send Signal to Thread<br><br></li>
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<li><a href="users_96.htm">pthread_sigmask()</a>--Set or Get Signal Mask</li>
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</ul>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<pre>
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#define _MULTI_THREADED
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#include <pthread.h>
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#include <stdio.h>
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#include <signal.h>
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#include "check.h"
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void sighand(int signo);
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void cancellationCleanup(void *parm) { printf("Thread was canceled\n"); }
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void *threadfunc(void *parm)
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{
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pthread_t self = pthread_self();
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pthread_id_np_t tid;
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int rc;
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int i=5;
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pthread_getunique_np(&self, &tid);
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printf("Thread 0x%.8x %.8x entered\n", tid);
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while (i--) {
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printf("Thread 0x%.8x %.8x looping\n",
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tid, rc, errno);
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sleep(2);
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pthread_testcancel();
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}
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printf("Thread 0x%.8x %.8x did not expect to get here\n",
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tid);
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return NULL;
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}
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int main(int argc, char **argv)
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{
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int rc;
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int i;
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pthread_t thread;
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struct sigaction actions;
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sigset_t mask;
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void *status;
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pthread_t self;
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pthread_id_np_t tid;
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printf("Enter Testcase - %s\n", argv[0]);
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printf("Set up the alarm handler for the process\n");
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memset(&actions, 0, sizeof(actions));
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sigemptyset(&actions.sa_mask);
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actions.sa_flags = 0;
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actions.sa_handler = sighand;
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rc = sigaction(SIGALRM,&actions,NULL);
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checkResults("sigaction\n", rc);
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printf("Block all signals in the parent so they can be inherited\n");
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sigfillset(&mask); /* Mask all allowed signals */
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rc = pthread_sigmask(SIG_BLOCK, &mask, NULL);
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checkResults("pthread_sigmask()\n", rc);
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printf("Create thread that inherits blocking mask\n");
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/* Thread will inherit blocking mask */
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rc = pthread_create(&thread, NULL, threadfunc, NULL);
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checkResults("pthread_create()\n", rc);
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/* Convert signals to cancels */
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rc = pthread_signal_to_cancel_np(&mask, &thread);
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checkResults("pthread_signal_to_cancel()\n", rc);
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sleep(3);
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self = pthread_self();
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pthread_getunique_np(&self, &tid);
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printf("Thread 0x%.8x %.8x sending a signal to the process\n", tid);
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kill(getpid(), SIGALRM);
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checkResults("kill()\n", rc);
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printf("Wait for masked and unmasked threads to complete\n");
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rc = pthread_join(thread, &status);
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checkResults("pthread_join()\n", rc);
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if (status != PTHREAD_CANCELED) {
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printf("Got an incorrect thread status\n");
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return 1;
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}
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printf("The target thread was canceled\n");
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printf("Main completed\n");
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return 0;
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}
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void sighand(int signo)
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{
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pthread_t self = pthread_self();
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pthread_id_np_t tid;
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pthread_getunique_np(&self, &tid);
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printf("Thread 0x%.8x %.8x in signal handler\n",
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tid);
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return;
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}
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</pre>
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<p><strong>Output:</strong></p>
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<pre>
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Enter Testcase - QP0WTEST/TPSIG2C0
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Set up the alarm handler for the process
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Block all signals in the parent so they can be inherited
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Create thread that inherits blocking mask
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Thread 0x00000000 00000007 entered
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Thread 0x00000000 00000007 looping
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Thread 0x00000000 00000007 looping
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Thread 0x00000000 00000006 sending a signal to the process
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Wait for masked and unmasked threads to complete
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The target thread was canceled
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Main completed
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</pre>
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<hr>
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API introduced: V4R3
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"rzah4mst.htm">Pthread APIs</a> | <a href="aplist.htm">APIs by
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category</a></td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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