1 /*
2 * Copyright (C) 2006 iptelorg GmbH
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 /**
18 * @defgroup atomic Kamailio atomic operations
19 * @brief Kamailio atomic operations and memory barriers support
20 *
21 * Kamailio atomic operations and memory barriers support for different CPU
22 * architectures implemented in assembler. It also provides some generic
23 * fallback code for architectures not currently supported.
24 */
25
26 /**
27 * @file
28 * @brief Common part for all the atomic operations
29 *
30 * Common part for all the atomic operations (atomic_t and common operations)
31 * see atomic_ops.h for more info.
32 * @ingroup atomic
33 */
34
35 #ifndef __atomic_common
36 #define __atomic_common
37
38 /**
39 * @brief atomic_t defined as a struct to easily catch non atomic operations on it.
40 *
41 * atomic_t defined as a struct to easily catch non atomic operations on it,
42 * e.g. atomic_t foo; foo++ will generate a compile error.
43 */
44 typedef struct{ volatile int val; } atomic_t;
45
46
47 /**
48 * @name Atomic load and store operations
49 * Atomic store and load operations are atomic on all cpus, note however that they
50 * don't include memory barriers so if you want to use atomic_{get,set}
51 * to implement mutexes you must use the mb_* versions or explicitely use
52 * the barriers
53 */
54
55 /*@{ */
56
57 #define atomic_set_int(pvar, i) (*(int*)(pvar)=i)
58 #define atomic_set_long(pvar, i) (*(long*)(pvar)=i)
59 #define atomic_get_int(pvar) (*(int*)(pvar))
60 #define atomic_get_long(pvar) (*(long*)(pvar))
61
62 #define atomic_set(at_var, value) (atomic_set_int(&((at_var)->val), (value)))
63
atomic_get(atomic_t * v)64 inline static int atomic_get(atomic_t *v)
65 {
66 return atomic_get_int(&(v->val));
67 }
68
69 /*@} */
70
71 #endif
72