merging r/w locks

From: Date: Tue, 09 Sep 2025 08:14:31 +0000
Subject: merging r/w locks
Groups: php.internals 
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Hi internals,

Is there any hope to have https://github.com/php/php-src/pull/16565
merged before 8.5? It's too late to address all the locks, but having it as part of the ABI
would be nice so we can start fixing them for 8.6/9.0. In FrankenPHP, if something takes a lock, it
can significantly affect performance. By using r/w locks instead of exclusive locks, we can use
shared locks when reading instead of exclusive locks.

— Rob

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