static/netbsd/man4/sem.4 4.html


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<table class="head">
  <tr>
    <td class="head-ltitle">SEM(4)</td>
    <td class="head-vol">Device Drivers Manual</td>
    <td class="head-rtitle">SEM(4)</td>
  </tr>
</table>
<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<p class="Pp"><code class="Nm">sem</code> &#x2014; <span class="Nd">POSIX
    semaphores</span></p>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<p class="Pp">The POSIX semaphore code is included by default in all
  kernels.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">The <code class="Nm">sem</code> facility provides system calls
    used by the standard C library (libc) to implement POSIX semaphores.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
  ALSO</a></h1>
<p class="Pp"><a class="Xr">config(1)</a>, <a class="Xr">sem_destroy(3)</a>,
    <a class="Xr">sem_getvalue(3)</a>, <a class="Xr">sem_init(3)</a>,
    <a class="Xr">sem_open(3)</a>, <a class="Xr">sem_post(3)</a>,
    <a class="Xr">sem_wait(3)</a>, <a class="Xr">options(4)</a></p>
</section>
<section class="Sh">
<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
<p class="Pp">The <code class="Nm">sem</code> facility appeared as a kernel
    option in <span class="Ux">NetBSD 2.0</span> and became non-optional in
    <span class="Ux">NetBSD 7.0</span>.</p>
</section>
</div>
<table class="foot">
  <tr>
    <td class="foot-date">August 20, 2015</td>
    <td class="foot-os">NetBSD 10.1</td>
  </tr>
</table>