FM-TOWNS AUDIO: fix thread lockups and cleanup

- fixed lockup situation in imuse destructor (only concerning the fm-towns driver)
- fixed lockup situation when AudioCDManager functions get called
(in both cases both the main thread and the mixer thread would get locked in different mutex belonging to the other thread)

1 files changed, 6 insertions, 3 deletions

diff --git a/engines/scumm/player_towns.cpp b/engines/scumm/player_towns.cpp
index 5d49478cb0..15b2f65797 100644
--- a/engines/scumm/player_towns.cpp
+++ b/engines/scumm/player_towns.cpp
@@ -581,11 +581,14 @@ Player_Towns_v2::Player_Towns_v2(ScummEngine *vm, Audio::Mixer *mixer, IMuse *im
 }
 
 Player_Towns_v2::~Player_Towns_v2() {
-	delete _intf;
-	_intf = 0;
-
+	// Avoid lockup in imuse.cpp, line 78
+	_intf->lockInternal();
 	if (_imuseDispose)
 		delete _imuse;
+	_intf->unlockInternal();
+
+	delete _intf;
+	_intf = 0;
 
 	delete[] _sblData;
 	delete[] _soundOverride;