<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - local static object not Thread safe on Ubuntu 16 clang 3.7"
href="https://bugs.llvm.org/show_bug.cgi?id=43632">43632</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>local static object not Thread safe on Ubuntu 16 clang 3.7
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>3.7
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>elia.mirov@gm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Hi,
We are using Clang 3.7 with flag -- -std=c++14
We found an issue with Singleton thread safe.
In our code we implemented “Meyers Singleton” as described in
<a href="https://www.modernescpp.com/index.php/thread-safe-initialization-of-data">https://www.modernescpp.com/index.php/thread-safe-initialization-of-data</a>
This is thread safe implementation guaranteed by std C++ 11 and has by far
better performance according to
<a href="https://www.modernescpp.com/index.php/thread-safe-initialization-of-a-singleton">https://www.modernescpp.com/index.php/thread-safe-initialization-of-a-singleton</a>
However, this implementation is not thread safe if using libc++ 11
compilation, as we happen to know now, and we had to add a lock_guard to
overcome this issue.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>