From aa347029da5b7964f649964700e0390f84020d98 Mon Sep 17 00:00:00 2001
From: Gert Wollny <gert.wollny@collabora.com>
Date: Mon, 8 Apr 2024 14:59:30 +0200
Subject: [PATCH] futex: disable futexes when compiling with tsan

Thread sanitizer doesn't support futexes, so don't use them in this case
and fall back to standard mutexes. With that we can avoid tsan reporting
a large number of false positives.

v2: use #if instead of #ifdef to test the value of the define

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28650>
---
 src/util/futex.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/util/futex.h b/src/util/futex.h
index 31e56b916ff..b7ce0884155 100644
--- a/src/util/futex.h
+++ b/src/util/futex.h
@@ -24,6 +24,9 @@
 #ifndef UTIL_FUTEX_H
 #define UTIL_FUTEX_H
 
+#if THREAD_SANITIZER
+#define UTIL_FUTEX_SUPPORTED 0
+#else
 #if defined(HAVE_LINUX_FUTEX_H) && defined(__linux__)
 #define UTIL_FUTEX_SUPPORTED 1
 #elif defined(__FreeBSD__)
@@ -35,6 +38,7 @@
 #else
 #define UTIL_FUTEX_SUPPORTED 0
 #endif
+#endif
 
 #if UTIL_FUTEX_SUPPORTED
 #include <stdint.h>