/usr/include/urcu/system.h is in liburcu-dev 0.9.1-3.
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 | #ifndef _URCU_SYSTEM_H
#define _URCU_SYSTEM_H
/*
* system.h
*
* System definitions.
*
* Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*/
#include <urcu/compiler.h>
#include <urcu/arch.h>
/*
* Identify a shared load. A cmm_smp_rmc() or cmm_smp_mc() should come
* before the load.
*/
#define _CMM_LOAD_SHARED(p) CMM_ACCESS_ONCE(p)
/*
* Load a data from shared memory, doing a cache flush if required.
*/
#define CMM_LOAD_SHARED(p) \
__extension__ \
({ \
cmm_smp_rmc(); \
_CMM_LOAD_SHARED(p); \
})
/*
* Identify a shared store. A cmm_smp_wmc() or cmm_smp_mc() should
* follow the store.
*/
#define _CMM_STORE_SHARED(x, v) __extension__ ({ CMM_ACCESS_ONCE(x) = (v); })
/*
* Store v into x, where x is located in shared memory. Performs the
* required cache flush after writing. Returns v.
*/
#define CMM_STORE_SHARED(x, v) \
__extension__ \
({ \
__typeof__(x) _v = _CMM_STORE_SHARED(x, v); \
cmm_smp_wmc(); \
_v = _v; /* Work around clang "unused result" */ \
})
#endif /* _URCU_SYSTEM_H */
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