X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=compiler.h;fp=compiler.h;h=0000000000000000000000000000000000000000;hb=ec4e58a3aba2084440012f8ccac3a31eb6101183;hp=99972f30e2ba89726f663c78261f4e9203b6d026;hpb=2f873279bc92fac32e6549d6eb72f3197c7048ac;p=urcu.git diff --git a/compiler.h b/compiler.h deleted file mode 100644 index 99972f3..0000000 --- a/compiler.h +++ /dev/null @@ -1,50 +0,0 @@ -#ifndef _COMPILER_H -#define _COMPILER_H - -/* - * compiler.h - * - * Compiler definitions. - * - * Copyright (c) 2009 Mathieu Desnoyers - * - * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED - * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. - * - * Permission is hereby granted to use or copy this program - * for any purpose, provided the above notices are retained on all copies. - * Permission to modify the code and to distribute modified code is granted, - * provided the above notices are retained, and a notice that the code was - * modified is included with the above copyright notice. - */ - -#define likely(x) __builtin_expect(!!(x), 1) -#define unlikely(x) __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 - * successive instances of ACCESS_ONCE(), but only when the compiler is aware of - * particular ordering. Compiler ordering can be ensured, for example, by - * putting two ACCESS_ONCE() in separate C statements. - * - * This macro does absolutely -nothing- to prevent the CPU from reordering, - * merging, or refetching absolutely anything at any time. Its main intended - * 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) - -#if (__GNUC__ == 4) -#define __compiler_offsetof(a, b) __builtin_offsetof(a, b) -#endif - -#ifdef __compiler_offsetof -#define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER) -#else -#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) -#endif - -#endif /* _COMPILER_H */