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<title>GNU libgomp: GOMP_RTEMS_THREAD_POOLS</title>
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Previous: <a href="GOMP_005fSPINCOUNT.html#GOMP_005fSPINCOUNT" accesskey="p" rel="prev">GOMP_SPINCOUNT</a>, Up: <a href="Environment-Variables.html#Environment-Variables" accesskey="u" rel="up">Environment Variables</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Library-Index.html#Library-Index" title="Index" rel="index">Index</a>]</p>
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<a name="GOMP_005fRTEMS_005fTHREAD_005fPOOLS-_002d_002d-Set-the-RTEMS-specific-thread-pools"></a>
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<h3 class="section">3.19 <code>GOMP_RTEMS_THREAD_POOLS</code> – Set the RTEMS specific thread pools</h3>
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<a name="index-Environment-Variable-18"></a>
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<a name="index-Implementation-specific-setting-5"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p>This environment variable is only used on the RTEMS real-time operating system.
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It determines the scheduler instance specific thread pools. The format for
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<code>GOMP_RTEMS_THREAD_POOLS</code> is a list of optional
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<code><thread-pool-count>[$<priority>]@<scheduler-name></code> configurations
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separated by <code>:</code> where:
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</p><ul>
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<li> <code><thread-pool-count></code> is the thread pool count for this scheduler
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instance.
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</li><li> <code>$<priority></code> is an optional priority for the worker threads of a
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thread pool according to <code>pthread_setschedparam</code>. In case a priority
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value is omitted, then a worker thread will inherit the priority of the OpenMP
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master thread that created it. The priority of the worker thread is not
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changed after creation, even if a new OpenMP master thread using the worker has
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a different priority.
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</li><li> <code>@<scheduler-name></code> is the scheduler instance name according to the
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RTEMS application configuration.
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</li></ul>
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<p>In case no thread pool configuration is specified for a scheduler instance,
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then each OpenMP master thread of this scheduler instance will use its own
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dynamically allocated thread pool. To limit the worker thread count of the
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thread pools, each OpenMP master thread must call <code>omp_set_num_threads</code>.
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</p></dd>
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<dt><em>Example</em>:</dt>
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<dd><p>Lets suppose we have three scheduler instances <code>IO</code>, <code>WRK0</code>, and
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<code>WRK1</code> with <code>GOMP_RTEMS_THREAD_POOLS</code> set to
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<code>"1@WRK0:3$4@WRK1"</code>. Then there are no thread pool restrictions for
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scheduler instance <code>IO</code>. In the scheduler instance <code>WRK0</code> there is
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one thread pool available. Since no priority is specified for this scheduler
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instance, the worker thread inherits the priority of the OpenMP master thread
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that created it. In the scheduler instance <code>WRK1</code> there are three thread
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pools available and their worker threads run at priority four.
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</p></dd>
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</dl>
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Previous: <a href="GOMP_005fSPINCOUNT.html#GOMP_005fSPINCOUNT" accesskey="p" rel="prev">GOMP_SPINCOUNT</a>, Up: <a href="Environment-Variables.html#Environment-Variables" accesskey="u" rel="up">Environment Variables</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Library-Index.html#Library-Index" title="Index" rel="index">Index</a>]</p>
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