X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=compiler.h;h=717465c4d8570ce443e8cec4bb5b1abe3f3a0765;hp=fb09ca2b9b238ceec418ba5c21c660b4cebcb7fd;hb=2dc5fa0f7cfbfb0a64a7a67b39626650e863f16a;hpb=d8429b11e257939635c5dc4786756effdc38b494

diff --git a/compiler.h b/compiler.h
index fb09ca2..717465c 100644
--- a/compiler.h
+++ b/compiler.h
@@ -25,6 +25,11 @@
  * IBM's contributions to this file may be relicensed under LGPLv2 or later.
  */
 
+#define likely()	__builtin_expect(!!(x), 1)
+#define unlikely()	__builtin_expect(!!(x), 0)
+
+#define	barrier()	asm volatile("" : : : "memory");
+
 /*
  * Instruct the compiler to perform only a single access to a variable
  * (prohibits merging and refetching). The compiler is also forbidden to reorder
@@ -37,5 +42,6 @@
  * use is to mediate communication between process-level code and irq/NMI
  * handlers, all running on the same CPU.
  */
+#define ACCESS_ONCE(x)	(*(volatile typeof(x) *)&x)
 
 #endif /* _COMPILER_H */