From 1153b97ace78afe69979d6aa0545486a5b01bb78 Mon Sep 17 00:00:00 2001
From: Matt <m.moninger.h@gmail.com>
Date: Sun, 31 Mar 2019 16:51:55 +0200
Subject: [PATCH] Use thread_local to protect globals from data race

---
 src/openrct2/drawing/Drawing.cpp | 8 ++++----
 src/openrct2/drawing/Drawing.h   | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/openrct2/drawing/Drawing.cpp b/src/openrct2/drawing/Drawing.cpp
index 30f9dda4a0..a2caf9e958 100644
--- a/src/openrct2/drawing/Drawing.cpp
+++ b/src/openrct2/drawing/Drawing.cpp
@@ -19,11 +19,11 @@
 #include "../world/Water.h"
 
 // HACK These were originally passed back through registers
-int32_t gLastDrawStringX;
-int32_t gLastDrawStringY;
+thread_local int32_t gLastDrawStringX;
+thread_local int32_t gLastDrawStringY;
 
-int16_t gCurrentFontSpriteBase;
-uint16_t gCurrentFontFlags;
+thread_local int16_t gCurrentFontSpriteBase;
+thread_local uint16_t gCurrentFontFlags;
 
 uint8_t gGamePalette[256 * 4];
 uint32_t gPaletteEffectFrame;
diff --git a/src/openrct2/drawing/Drawing.h b/src/openrct2/drawing/Drawing.h
index d56404fd90..0e98f3358c 100644
--- a/src/openrct2/drawing/Drawing.h
+++ b/src/openrct2/drawing/Drawing.h
@@ -237,8 +237,8 @@ struct rct_size16
 
 #define MAX_SCROLLING_TEXT_MODES 38
 
-extern int16_t gCurrentFontSpriteBase;
-extern uint16_t gCurrentFontFlags;
+extern thread_local int16_t gCurrentFontSpriteBase;
+extern thread_local uint16_t gCurrentFontFlags;
 
 extern rct_palette_entry gPalette[256];
 extern uint8_t gGamePalette[256 * 4];
@@ -250,8 +250,8 @@ extern uint8_t gOtherPalette[256];
 extern uint8_t text_palette[];
 extern const translucent_window_palette TranslucentWindowPalettes[COLOUR_COUNT];
 
-extern int32_t gLastDrawStringX;
-extern int32_t gLastDrawStringY;
+extern thread_local int32_t gLastDrawStringX;
+extern thread_local int32_t gLastDrawStringY;
 
 extern uint32_t gPickupPeepImage;
 extern int32_t gPickupPeepX;