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<title>Constructs a new SyncSharedMemory object</title>
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<h1 class="refname">SyncSharedMemory::__construct</h1>
<p class="verinfo">(PECL sync >= 1.1.0)</p><p class="refpurpose"><span class="refname">SyncSharedMemory::__construct</span> — <span class="dc-title">Constructs a new SyncSharedMemory object</span></p>
</div>
<div class="refsect1 description" id="refsect1-syncsharedmemory.construct-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="methodname"><strong>SyncSharedMemory::__construct</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$name</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$size</code></span>
)</div>
<p class="para rdfs-comment">
Constructs a named shared memory object.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-syncsharedmemory.construct-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<code class="parameter">name</code></dt>
<dd>
<p class="para">
The name of the shared memory object.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
If the name already exists, it must be able to be opened by the current user
that the process is running as or an exception will be thrown with a meaningless
error message.
</p>
</p></blockquote>
</dd>
<dt>
<code class="parameter">size</code></dt>
<dd>
<p class="para">
The size, in bytes, of shared memory to reserve.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
The amount of memory cannot be resized later. Request sufficient storage up front.
</p>
</p></blockquote>
</dd>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-syncsharedmemory.construct-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
The new SyncSharedMemory object. An exception is thrown if the shared memory
object cannot be created or opened.
</p>
</div>
<div class="refsect1 examples" id="refsect1-syncsharedmemory.construct-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-4606">
<p><strong>Example #1 <span class="function"><strong>SyncSharedMemory::__construct()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// You will probably need to protect shared memory with other synchronization objects.<br />// Shared memory goes away when the last reference to it disappears.<br /></span><span style="color: #0000BB">$mem </span><span style="color: #007700">= new </span><span style="color: #0000BB">SyncSharedMemory</span><span style="color: #007700">(</span><span style="color: #DD0000">"AppReportName"</span><span style="color: #007700">, </span><span style="color: #0000BB">1024</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">$mem</span><span style="color: #007700">-></span><span style="color: #0000BB">first</span><span style="color: #007700">())<br />{<br /> </span><span style="color: #FF8000">// Do first time initialization work here.<br /></span><span style="color: #007700">}<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">$mem</span><span style="color: #007700">-></span><span style="color: #0000BB">write</span><span style="color: #007700">(</span><span style="color: #0000BB">json_encode</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"name" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"my_report.txt"</span><span style="color: #007700">)));<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-syncsharedmemory.construct-seealso">
<h3 class="title">See Also</h3>
<ul class="simplelist">
<li class="member"><span class="methodname"><a href="syncsharedmemory.first.html" class="methodname" rel="rdfs-seeAlso">SyncSharedMemory::first()</a> - Check to see if the object is the first instance system-wide of named shared memory</span></li>
<li class="member"><span class="methodname"><a href="syncsharedmemory.size.html" class="methodname" rel="rdfs-seeAlso">SyncSharedMemory::size()</a> - Returns the size of the named shared memory</span></li>
<li class="member"><span class="methodname"><a href="syncsharedmemory.write.html" class="methodname" rel="rdfs-seeAlso">SyncSharedMemory::write()</a> - Copy data to named shared memory</span></li>
<li class="member"><span class="methodname"><a href="syncsharedmemory.read.html" class="methodname" rel="rdfs-seeAlso">SyncSharedMemory::read()</a> - Copy data from named shared memory</span></li>
</ul>
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