Reinsert missing test_urcu_*.c files (missing in rename)
[urcu.git] / urcu / compiler.h
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1#ifndef _URCU_COMPILER_H
2#define _URCU_COMPILER_H
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3
4/*
5 * compiler.h
6 *
7 * Compiler definitions.
8 *
6982d6d7 9 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
af02d47e 10 *
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11 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
12 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
af02d47e 13 *
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14 * Permission is hereby granted to use or copy this program
15 * for any purpose, provided the above notices are retained on all copies.
16 * Permission to modify the code and to distribute modified code is granted,
17 * provided the above notices are retained, and a notice that the code was
18 * modified is included with the above copyright notice.
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19 */
20
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21#include <stddef.h> /* for offsetof */
22
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23#define likely(x) __builtin_expect(!!(x), 1)
24#define unlikely(x) __builtin_expect(!!(x), 0)
2dc5fa0f 25
5481ddb3 26#define cmm_barrier() asm volatile("" : : : "memory")
2dc5fa0f 27
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28/*
29 * Instruct the compiler to perform only a single access to a variable
30 * (prohibits merging and refetching). The compiler is also forbidden to reorder
6cf3827c 31 * successive instances of CMM_ACCESS_ONCE(), but only when the compiler is aware of
af02d47e 32 * particular ordering. Compiler ordering can be ensured, for example, by
6cf3827c 33 * putting two CMM_ACCESS_ONCE() in separate C statements.
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34 *
35 * This macro does absolutely -nothing- to prevent the CPU from reordering,
36 * merging, or refetching absolutely anything at any time. Its main intended
37 * use is to mediate communication between process-level code and irq/NMI
38 * handlers, all running on the same CPU.
39 */
6cf3827c 40#define CMM_ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
af02d47e 41
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42#ifndef caa_max
43#define caa_max(a,b) ((a)>(b)?(a):(b))
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44#endif
45
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46#ifndef caa_min
47#define caa_min(a,b) ((a)<(b)?(a):(b))
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48#endif
49
1b27a772 50#if defined(__SIZEOF_LONG__)
06f22bdb 51#define CAA_BITS_PER_LONG (__SIZEOF_LONG__ * 8)
1b27a772 52#elif defined(_LP64)
06f22bdb 53#define CAA_BITS_PER_LONG 64
1b27a772 54#else
06f22bdb 55#define CAA_BITS_PER_LONG 32
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56#endif
57
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58/*
59 * caa_container_of - Get the address of an object containing a field.
60 *
61 * @ptr: pointer to the field.
62 * @type: type of the object.
63 * @member: name of the field within the object.
64 */
65#define caa_container_of(ptr, type, member) \
453629a9 66 ({ \
b194c06e 67 const typeof(((type *) NULL)->member) * __ptr = (ptr); \
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68 (type *)((char *)__ptr - offsetof(type, member)); \
69 })
70
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71#define CAA_BUILD_BUG_ON_ZERO(cond) (sizeof(struct { int:-!!(cond); }))
72#define CAA_BUILD_BUG_ON(cond) ((void)BUILD_BUG_ON_ZERO(cond))
73
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74/*
75 * __rcu is an annotation that documents RCU pointer accesses that need
76 * to be protected by a read-side critical section. Eventually, a static
77 * checker will be able to use this annotation to detect incorrect RCU
78 * usage.
79 */
80#define __rcu
81
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82#ifdef __cplusplus
83#define URCU_FORCE_CAST(type, arg) (reinterpret_cast<type>(arg))
84#else
85#define URCU_FORCE_CAST(type, arg) ((type) (arg))
86#endif
87
ec4e58a3 88#endif /* _URCU_COMPILER_H */
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