/usr/include/urcu/compiler.h is in liburcu-dev 0.6.7-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 | #ifndef _URCU_COMPILER_H
#define _URCU_COMPILER_H
/*
* compiler.h
*
* Compiler definitions.
*
* Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* 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.
*/
#include <stddef.h> /* for offsetof */
#define caa_likely(x) __builtin_expect(!!(x), 1)
#define caa_unlikely(x) __builtin_expect(!!(x), 0)
#define cmm_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 CMM_ACCESS_ONCE(), but only when the compiler is aware of
* particular ordering. Compiler ordering can be ensured, for example, by
* putting two CMM_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 CMM_ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
#ifndef caa_max
#define caa_max(a,b) ((a)>(b)?(a):(b))
#endif
#ifndef caa_min
#define caa_min(a,b) ((a)<(b)?(a):(b))
#endif
#if defined(__SIZEOF_LONG__)
#define CAA_BITS_PER_LONG (__SIZEOF_LONG__ * 8)
#elif defined(_LP64)
#define CAA_BITS_PER_LONG 64
#else
#define CAA_BITS_PER_LONG 32
#endif
/*
* caa_container_of - Get the address of an object containing a field.
*
* @ptr: pointer to the field.
* @type: type of the object.
* @member: name of the field within the object.
*/
#define caa_container_of(ptr, type, member) \
({ \
const typeof(((type *) NULL)->member) * __ptr = (ptr); \
(type *)((char *)__ptr - offsetof(type, member)); \
})
#define CAA_BUILD_BUG_ON_ZERO(cond) (sizeof(struct { int:-!!(cond); }))
#define CAA_BUILD_BUG_ON(cond) ((void)BUILD_BUG_ON_ZERO(cond))
/*
* __rcu is an annotation that documents RCU pointer accesses that need
* to be protected by a read-side critical section. Eventually, a static
* checker will be able to use this annotation to detect incorrect RCU
* usage.
*/
#define __rcu
#ifdef __cplusplus
#define URCU_FORCE_CAST(type, arg) (reinterpret_cast<type>(arg))
#else
#define URCU_FORCE_CAST(type, arg) ((type) (arg))
#endif
#endif /* _URCU_COMPILER_H */
|