123 lines
4.3 KiB
HTML
123 lines
4.3 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>i5/OS Pthreads versus the POSIX standard, the Single UNIX
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Specification, and other threads implementations</title>
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<!-- File Edited November 2001 -->
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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>i5/OS Pthreads versus the POSIX standard, the Single UNIX Specification,
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and other threads implementations</h2>
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<p>Although the Pthread interfaces described in this document are based on a
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subset of the APIs defined in the POSIX standard and the Single UNIX
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Specification, the implementation of these APIs is not compliant with these
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standards. This means that applications written in other versions of threads
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are not necessarily portable to i5/OS. Below is a list of the differences
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between the Pthread APIs and other threads implementations.</p>
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<ul>
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<li><a href="concep10.htm" target="text">All thread definitions in
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pthread.h</a></li>
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<li><a href="concep11.htm" target="text">Unsupported preprocessor and feature
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test macros</a></li>
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<li><a href="users_98.htm" target="text">Unsupported APIs</a></li>
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<li><a href="concep13.htm" target="text">Unsupported constants</a></li>
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<li><a href="concep14.htm" target="text">Unsupported cancellation
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points</a></li>
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<li><a href="concep15.htm" target="text">Unsupported sysconf() configuration
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variables</a></li>
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<li><a href="concep16.htm" target="text">Thread priority and
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scheduling</a></li>
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<li><a href="concep17.htm" target="text">Thread ID vs. Pthread Handle
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(pthread_t)</a></li>
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<li><a href="concep18.htm" target="text">Thread ID value and size</a></li>
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<li><a href="concep19.htm" target="text">Mutexes return EDEADLK when re-locked
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by owner</a></li>
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<li><a href="concep20.htm" target="text">Return values from thread start
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routines are not integers</a></li>
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<li><a href="concep21.htm" target="text">Threads do not necessarily start
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before pthread_create() returns</a></li>
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<li><a href="concep22.htm" target="text">Initial thread is special, cannot
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pthread_exit()</a></li>
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<li><a href="concep23.htm" target="text">Pthread APIs cause asynchronous
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signals initialization</a></li>
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<li><a href="concep24.htm" target="text">Not all jobs can create threads;
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pthread_create() fails with EBUSY</a></li>
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<li><a href="concep25.htm" target="text">Read/write locks are
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recursive</a></li>
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<li><a href="concep26.htm" target="text">Shared read/write locks are released
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at thread termination</a></li>
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<li><a href="concep26.htm#293561" target="text">Read/write locks can be
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upgraded / downgraded</a></li>
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<li><a href="concep27.htm" target="text">Read/write locks do not favor
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writers</a></li>
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<li><a href="concep28.htm" target="text">Spawn API provides more POSIX-like
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process model</a></li>
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<li><a href="concep29.htm" target="text">C++ destructors and Pthread
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termination</a></li>
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<li><a href="concep30.htm" target="text">Unhandled exceptions terminate the
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thread (not the process)</a></li>
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<li><a href="concep31.htm" target="text">Exceptions vs. Asynchronous signals
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vs. ANSI C signals</a></li>
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<li><a href="mutexes.htm">Mutexes can be named to aid in application
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debug</a></li>
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</ul>
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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="#Top_Of_Page">Top</a> |
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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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