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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sharing-managed"></a>Managed modules</h2></div></div></div>
<p><code class="literal">p11-kit</code> wraps PKCS#11 modules to manage
them and customize their functionality so that they are able
to be shared between multiple callers in the same process.</p>
<p>Each caller that uses the
<a class="link" href="p11-kit-Modules.html#p11-kit-modules-load" title="p11_kit_modules_load ()"><code class="function">p11_kit_modules_load()</code></a>
or <a class="link" href="p11-kit-Modules.html#p11-kit-module-load" title="p11_kit_module_load ()"><code class="function">p11_kit_module_load()</code></a>
function gets independent wrapped PKCS#11 module(s). This is unless a caller
or module configuration specifies that a module should be used in an
unmanaged fashion.</p>
<p>When modules are managed, the following aspects are wrapped and
coordinated:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>Calls to <code class="literal">C_Initialize</code> and
<code class="literal">C_Finalize</code> can be called by multiple
callers.</p>
<p>The first time that the managed module
<code class="literal">C_Initialize</code> is called, the PKCS#11 module's actual
<code class="literal">C_Initialize</code> function is called. Subsequent calls by
other callers will cause <code class="literal">p11-kit</code> to increment an
internal initialization count, rather than calling
<code class="literal">C_Initialize</code> again.</p>
<p>Multiple callers can call the managed
<code class="literal">C_Initialize</code> function concurrently from different
threads and <code class="literal">p11-kit</code> will guarantee that this managed
in a thread-safe manner.</p>
</li>
<li class="listitem">
<p>When the managed module <code class="literal">C_Finalize</code> is used
to finalize a module, each time it is called it decrements the internal
initialization count for that module. When the internal initialization
count reaches zero, the module's actual <code class="literal">C_Finalize</code>
function is called.</p>
<p>Multiple callers can call the managed <code class="literal">C_Finalize</code>
function concurrently from different threads and <code class="literal">p11-kit</code>
will guarantee that this managed in a thread-safe manner.</p>
</li>
<li class="listitem"><p>Call to <code class="literal">C_CloseAllSessions</code> only close the
sessions that the caller of the managed module has opened. This allows the
<code class="literal">C_CloseAllSessions</code> function to be used without closing
sessions for other callers of the same PKCS#11 module.</p></li>
<li class="listitem"><p>Managed modules have ability to log PKCS#11 method calls for debugging
purposes. See the <a class="link" href="pkcs11-conf.html#option-log-calls"><code class="literal">log-calls = yes</code></a>
module configuration option.</p></li>
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