From 31b7e18d7dac5c8a8ab45822ac9ec2451ffb3693 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sun, 6 Feb 2022 00:45:49 +0100
Subject: [PATCH] Fix edge-case race initialize_latencies() vs process()

Due to _init_countdown when the engine starts, it is
extremely unlikely that Session::initialize_latencies(),
which is invoked by AudioEngine::Running runs concurrently
with Session::process, but at least in theory it would be possible.
---
 libs/ardour/session.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index 3603b7c8c0..b3a8c146d6 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -6641,8 +6641,10 @@ Session::missing_filesources (DataType dt) const
 void
 Session::initialize_latencies ()
 {
+	block_processing ();
 	update_latency (false);
 	update_latency (true);
+	unblock_processing ();
 }
 
 void