From 41c2f7a68bf41b0114a640a039bd8bf411988d23 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Wed, 15 May 2024 11:07:03 -0400
Subject: atomic: Add atomic_{thread,signal}_fence() wrappers

---
 src/atomic.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/atomic.h b/src/atomic.h
index f1a6bea..7d32e73 100644
--- a/src/atomic.h
+++ b/src/atomic.h
@@ -8,6 +8,7 @@
 #ifndef BFS_ATOMIC_H
 #define BFS_ATOMIC_H
 
+#include "sanity.h"
 #include <stdatomic.h>
 
 /**
@@ -82,4 +83,22 @@
 #define fetch_and(obj, arg, order) \
 	atomic_fetch_and_explicit(obj, arg, memory_order_##order)
 
+/**
+ * Shorthand for atomic_thread_fence().
+ */
+#if SANITIZE_THREAD
+// TSan doesn't support fences: https://github.com/google/sanitizers/issues/1415
+#  define thread_fence(obj, order) \
+	fetch_add(obj, 0, order)
+#else
+#  define thread_fence(obj, order) \
+	atomic_thread_fence(memory_order_##order)
+#endif
+
+/**
+ * Shorthand for atomic_signal_fence().
+ */
+#define signal_fence(order) \
+	atomic_signal_fence(memory_order_##order)
+
 #endif // BFS_ATOMIC_H
-- 
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