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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> |
| <li class="listitem"><p>Managed modules have the ability to be remoted to another machine or |
| isolated in their own process. |
| See the <a class="link" href="pkcs11-conf.html#option-remote"><code class="literal">remote = ...</code></a> |
| module configuration option.</p></li> |
| </ul></div> |
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