54 lines
3.3 KiB
HTML
54 lines
3.3 KiB
HTML
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<meta name="DC.Title" content="Communications considerations for multithreaded programming" />
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<meta name="abstract" content="The only threadsafe communications protocol supported on i5/OS is sockets." />
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<title>Communications considerations for multithreaded programming</title>
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<body id="rzahwcmn-cmnco"><a name="rzahwcmn-cmnco"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Communications considerations for multithreaded programming</h1>
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<div><p>The only threadsafe communications protocol supported on <span class="keyword">i5/OS™</span> is sockets.</p>
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<div class="section"><div class="p">The use of sockets is subject to the following restrictions: <ul><li>Socket APIs:<p>The majority of the sockets interfaces
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are threadsafe, but most of the network routines are not due to the use of
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static storage. These routines have been replaced with threadsafe <em>_r</em> counterparts.
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For example, you should replace calls to <span class="apiname">gethostbyaddr()</span> with <span class="apiname">gethostbyaddr_r()</span>.
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The <em>_r</em> routines are compatible with the UNIX<sup>®</sup> definition. All <em>_r</em> functions
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reside in the existing service program <span class="filepath">QSOSRV2</span>.</p>
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</li>
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<li>AnyNet<sup>®</sup> using
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sockets:<p>AnyNet using sockets is considered threadsafe and
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is supported in multithread programs. However, this support has not undergone
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any formal testing.</p>
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</li>
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</ul>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahwas4co.htm" title="All programs have at least one thread, referred to as the initial thread. In a program with multiple threads, each thread runs its code independently of the other threads in the program.">Threads on i5/OS</a></div>
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