Commit | Line | Data |
---|---|---|
7e30abe3 MD |
1 | #ifndef _URCU_SYSTEM_H |
2 | #define _URCU_SYSTEM_H | |
3 | ||
4 | /* | |
5 | * system.h | |
6 | * | |
7 | * System definitions. | |
8 | * | |
9 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
10 | * | |
11 | * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED | |
12 | * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. | |
13 | * | |
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. | |
19 | */ | |
20 | ||
21 | #include <urcu/compiler.h> | |
22 | #include <urcu/arch.h> | |
23 | ||
24 | /* | |
25 | * Identify a shared load. A smp_rmc() or smp_mc() should come before the load. | |
26 | */ | |
27 | #define _LOAD_SHARED(p) ACCESS_ONCE(p) | |
28 | ||
29 | /* | |
30 | * Load a data from shared memory, doing a cache flush if required. | |
31 | */ | |
32 | #define LOAD_SHARED(p) \ | |
33 | ({ \ | |
34 | smp_rmc(); \ | |
35 | _LOAD_SHARED(p); \ | |
36 | }) | |
37 | ||
38 | /* | |
39 | * Identify a shared store. A smp_wmc() or smp_mc() should follow the store. | |
40 | */ | |
41 | #define _STORE_SHARED(x, v) ({ ACCESS_ONCE(x) = (v); }) | |
42 | ||
43 | /* | |
44 | * Store v into x, where x is located in shared memory. Performs the required | |
45 | * cache flush after writing. Returns v. | |
46 | */ | |
47 | #define STORE_SHARED(x, v) \ | |
48 | ({ \ | |
49 | _STORE_SHARED(x, v); \ | |
50 | smp_wmc(); \ | |
51 | (v); \ | |
52 | }) | |
53 | ||
54 | #endif /* _URCU_SYSTEM_H */ |