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<title>struct _rtl_ModuleCount</title>
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<a href="../names/index.html" alt="Global Namespace in C++"><font size="+1"><b>::</b></font></a> <div class="title"><h2>struct _rtl_ModuleCount</h2>
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<dl>
<dt>Base Classes</dt>
<dd>None.</dd>
</dl>
<dl>
<dt>Known Derived Classes</dt>
<dd>None.</dd>
</dl>
<br>
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<td width="25%" class="flagname">virtual</td>
<td width="25%" class="flagname">abstract</td>
<td width="25%" class="flagname">interface</td>
<td width="25%" class="flagname">template</td>
</tr>
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<td class="flagno">NO</td>
<td class="flagno">NO</td>
<td class="flagno">NO</td>
<td class="flagno">NO</td>
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<dl>
<dt>Description</dt>
<dd>Pointers to <code>rtl_ModuleCount</code> are passed as arguments to the default factory creator
functions: <code>createSingleComponentFactory</code>, <code>createSingleFactory</code>,
<code>createOneInstanceFactory</code>.
The factory implementation is calling <code>rtl_ModuleCount.acquire</code> when it is being
constructed and it is calling <code>rtl_ModuleCount.release</code>. The implementations of
<code>acquire</code>
and <code>release</code> should influence the return value of <code>component_canUnload</code>
in a way that it
returns <code>sal_False</code> after <code>acquire</code> has been called. That is the module will not be unloaded
once a default factory has been created. A call to <code>release</code> may cause
<code>component_canUnload</code> to return <code>sal_False</code>, but only if there are
no object alive which
originated from the module. These objects are factory instances and the service instances
which have been created by these factories.
<p>
It is not necessary to synchronize <code>acquire</code> and <code>release</code> as a whole.
Simply sychronize the
access to a counter variable, e.g. the <code>rtl_moduleCount_release</code> implementation:
<pre>
extern "C" void rtl_moduleCount_acquire(rtl_ModuleCount * that )
{
rtl_StandardModuleCount* pMod= (rtl_StandardModuleCount*)that;
osl_incrementInterlockedCount( &pMod->counter);
}
</pre>
The SAL library offers functions that can be used for <code>acquire</code> and <code>release</code>. See struct
<code>_rtl_StandardModuleCount</code>.
</dd>
</dl>
<dl>
<dt>File</dt>
<dd>unload.h</dd>
</dl>
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