From 6ad519ce8e8367f61187998dc8bb88dce60e7098 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sat, 17 Sep 2016 13:46:30 +0200
Subject: VST threading: prevent concurrent effSetChunk and process()

This is a potential fix for unreliable preset load/restore.
(http://mixbus.harrisonconsoles.com/forum/thread-1970-post-21486.html#pid21486)

Since a Glib Mutex can't be copy-constructed an explicit copy c'tor
is needed.
---
 libs/ardour/ardour/vst_plugin.h | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'libs/ardour/ardour/vst_plugin.h')

diff --git a/libs/ardour/ardour/vst_plugin.h b/libs/ardour/ardour/vst_plugin.h
index e56b9c005c..182b432692 100644
--- a/libs/ardour/ardour/vst_plugin.h
+++ b/libs/ardour/ardour/vst_plugin.h
@@ -40,6 +40,7 @@ class LIBARDOUR_API VSTPlugin : public Plugin
 {
 public:
 	VSTPlugin (AudioEngine &, Session &, VSTHandle *);
+	VSTPlugin (const VSTPlugin& other);
 	virtual ~VSTPlugin ();
 
 	void activate ();
@@ -119,6 +120,8 @@ protected:
 	framepos_t _transport_frame;
 	float      _transport_speed;
 	mutable std::map <uint32_t, float> _parameter_defaults;
+
+	Glib::Threads::Mutex _state_lock;
 };
 
 }
-- 
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