From f2278392473823eb5fbc4535f2728cac5637a59f Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Wed, 22 May 2024 19:44:17 +0200
Subject: [PATCH] Vapor: thread-safe export abort

Prevent concurrent processing while running finalize_export.
---
 libs/ardour/export_handler.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libs/ardour/export_handler.cc b/libs/ardour/export_handler.cc
index a7f2b4ed9e..d90c9cfb46 100644
--- a/libs/ardour/export_handler.cc
+++ b/libs/ardour/export_handler.cc
@@ -125,6 +125,7 @@ ExportHandler::ExportHandler (Session & session)
 ExportHandler::~ExportHandler ()
 {
 	if (export_status->aborted () && !current_timespan->vapor ().empty () && session.surround_master ()) {
+		Glib::Threads::Mutex::Lock l (export_status->lock());
 		session.surround_master ()->surround_return ()->finalize_export ();
 	}
 	graph_builder->cleanup (export_status->aborted () );