<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/94154>94154</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Is PassRegistry still not thread-safe?
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          falhumai96
      </td>
    </tr>
</table>

<pre>
    https://llvm.org/doxygen/classllvm_1_1PassRegistry.html#details

I'm looking at the details for this class, and I saw a note saying that this class is not thread-safe. However, looking at the class declaration in the headr file in private member fields and also looking at the .CPP file for the implementation, I noticed that all methods are being locked by a reader-writer lock. So, is the note outdated or does it still hold that statement?

The .CPP implementation for LLVM 19: https://llvm.org/doxygen/PassRegistry_8cpp_source.html for reference.

Also, speaking of which, I have a question regarding LLVM initialization (which internally they call PassRegistry). I understand that llvm initialization functions (e.g. initializeNativeTarget) must be called before any other llvm functions (e.g. JIT related code) and I understand that they can be called multiple times by the calling clients, but are the initialization functions thread-safe themselves? Meaning, can two threads call these functions safely, or are they only allowed to be called by one parent thread (e.g. the main thread)?
</pre>
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