From 35c7fd9d8320a9d97723591eb6ee48974f6be528 Mon Sep 17 00:00:00 2001
From: JP Cimalando <jpcima@users.noreply.github.com>
Date: Mon, 1 Jul 2019 17:55:12 +0200
Subject: dosbox: thread-safe global initialization

---
 src/chips/dosbox/dbopl.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'src/chips/dosbox/dbopl.cpp')

diff --git a/src/chips/dosbox/dbopl.cpp b/src/chips/dosbox/dbopl.cpp
index d1ab82f..5b4bf53 100644
--- a/src/chips/dosbox/dbopl.cpp
+++ b/src/chips/dosbox/dbopl.cpp
@@ -1507,11 +1507,15 @@ void Chip::Setup( Bit32u rate ) {
 	}
 }
 
-static bool doneTables = false;
+static volatile bool doneTables = false;
+static Mutex mutexTables;
+
 void InitTables( void ) {
 	if ( doneTables )
 		return;
-	doneTables = true;
+	MutexHolder lock( mutexTables );
+	if ( doneTables )
+		return;
 #if ( DBOPL_WAVE == WAVE_HANDLER ) || ( DBOPL_WAVE == WAVE_TABLELOG )
 	//Exponential volume table, same as the real adlib
 	for ( int i = 0; i < 256; i++ ) {
@@ -1661,6 +1665,7 @@ void InitTables( void ) {
 		}
 	}
 #endif
+	doneTables = true;
 }
 
 Bit32u Handler::WriteAddr( Bit32u port, Bit8u val ) {
-- 
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