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<TITLE>Tcl API Reference -- ns_sema</TITLE>
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<a name="81850">
</a><h3>ns_sema</h3>
<a name="81851">
</a><h4>Overview</h4>
<p><a name="81852">
</a>Manage semaphores</p>
<a name="81853">
</a><h4>Syntax</h4>
<p><a name="81854">
</a><b>ns_sema create</b> ?<i>count</i>?</p>
<p><a name="133166">
</a><b>ns_sema destroy</b> <i>semaid</i></p>
<p><a name="81855">
</a><b>ns_sema release</b> <i>semaid</i> ?<i>count</i>?</p>
<p><a name="81856">
</a><b>ns_sema wait</b> <i>semaid</i></p>
<a name="81858">
</a><h4>Description</h4>
<p><a name="81859">
</a><b>ns_sema create</b> initializes a semaphore and returns an ID for it. If the <i>count</i> argument is specified, the semaphore is initialized with that count. The default for <i>count</i> is 0.</p>
<p><a name="133170">
</a><b>ns_sema destroy</b> frees the resources associated with the specified semaphore. The <i>semaid</i> argument is the ID returned by <b>ns_sema create</b> when the semaphore was created.</p>
<p><a name="81860">
</a><b>ns_sema release</b> increments the count of the specified semaphore. By default, the semaphore is incremented 1 (one) time. If the <i>count</i> argument is specified, the semaphore is incremented <i>count</i> times. The <i>semaid</i> argument is the ID returned by <b>ns_sema create</b> when the semaphore was created.</p>
<p><a name="81861">
</a><b>ns_sema wait</b> waits for the count of the specified semaphore to be greater than 0 (zero). If it is greater than 0, the count is decremented and processing continues. If it is not greater than 0, it is blocked until this is possible. The <i>semaid</i> argument is the ID returned by <b>ns_sema create</b> when the semaphore was created.</p>
<a name="86824">
</a><h4>See Also</h4>
<p><a name="86834">
</a>Ns_InitializeSemaphore</p>
<p><a name="86826">
</a>Ns_DestroySemaphore</p>
<p><a name="86828">
</a>Ns_ReleaseSemaphore</p>
<p><a name="86829">
</a>Ns_WaitForSemaphore</p>
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