70 lines
3.2 KiB
HTML
70 lines
3.2 KiB
HTML
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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 APIs cause asynchronous signals initialization</title>
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<!-- Begin Header Records ========================================== -->
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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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<!-- Change History: -->
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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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<h2>Pthread APIs cause asynchronous signals initialization</h2>
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<p>When a job is running in i5/OS, by default it is not enabled for POSIX
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signals. The system never delivers a Posix signal to a job that is not enabled
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for signals.</p>
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<p>The job is initialized for signals with the default POSIX signals
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environment when any thread in the job calls any API defined to implicitly
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enable signals. The main categories of APIs that enable signals are the signals
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APIs themselves and some process-related APIs related to signals. For example,
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some of the APIs that enable signals are <strong>Qp0sEnableSignals()</strong>,
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<strong>kill()</strong>, <strong>sigaction()</strong>, <strong>sigprocmask()</strong>,
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<strong>getpid()</strong>, and <strong>spawn()</strong>. After the initialization
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for signals occurs within a job, the system can deliver signals to that job if
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they are generated by another job or by the system.</p>
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<p>When a program in a job uses Pthreads, that job is automatically enabled for
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signals when the Pthreads service program is loaded (either dynamically or
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statically). Loading the service program that contains the Pthread APIs causes
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the job to be initialized for signals, regardless of whether the application
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actually calls the pthread APIs. All pthread programs can implicitly receive
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signals if another job or the system generates a signal for the threaded
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job.</p>
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<p>If the application calls <strong>Qp0sDisableSignals()</strong> to disable
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signals for the job, the Pthreads APIs do not function correctly. Do not use
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<strong>Qp0sDisableSignals()</strong> in a threaded job.</p>
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<p>For more information about signals and the APIs mentioned in this section,
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see <a href="unix5a1.htm">Signal APIs</a> and <a href="unix11.htm">Process-Related
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APIs</a>.</p>
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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">
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<a href="rzah4mst.htm">Pthread APIs</a> |
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<a href="aplist.htm">APIs by 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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