1 /*
2 * Copyright (c) 2004-2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2002-2005 Mellanox Technologies LTD. All rights reserved.
4 * Copyright (c) 1996-2003 Intel Corporation. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 *
34 */
35
36 /*
37 * Abstract:
38 * Implementation specific header files for atomic operations.
39 */
40
41 #ifndef _CL_ATOMIC_OSD_H_
42 #define _CL_ATOMIC_OSD_H_
43
44 #include <complib/cl_types.h>
45 #include <complib/cl_spinlock.h>
46
47 #ifdef __cplusplus
48 # define BEGIN_C_DECLS extern "C" {
49 # define END_C_DECLS }
50 #else /* !__cplusplus */
51 # define BEGIN_C_DECLS
52 # define END_C_DECLS
53 #endif /* __cplusplus */
54
55 BEGIN_C_DECLS
56
57 extern cl_spinlock_t cl_atomic_spinlock;
58
cl_atomic_inc(IN atomic32_t * const p_value)59 static inline int32_t cl_atomic_inc(IN atomic32_t * const p_value)
60 {
61 int32_t new_val;
62
63 cl_spinlock_acquire(&cl_atomic_spinlock);
64 new_val = *p_value + 1;
65 *p_value = new_val;
66 cl_spinlock_release(&cl_atomic_spinlock);
67 return (new_val);
68 }
69
cl_atomic_dec(IN atomic32_t * const p_value)70 static inline int32_t cl_atomic_dec(IN atomic32_t * const p_value)
71 {
72 int32_t new_val;
73
74 cl_spinlock_acquire(&cl_atomic_spinlock);
75 new_val = *p_value - 1;
76 *p_value = new_val;
77 cl_spinlock_release(&cl_atomic_spinlock);
78 return (new_val);
79 }
80
81 static inline int32_t
cl_atomic_add(IN atomic32_t * const p_value,IN const int32_t increment)82 cl_atomic_add(IN atomic32_t * const p_value, IN const int32_t increment)
83 {
84 int32_t new_val;
85
86 cl_spinlock_acquire(&cl_atomic_spinlock);
87 new_val = *p_value + increment;
88 *p_value = new_val;
89 cl_spinlock_release(&cl_atomic_spinlock);
90 return (new_val);
91 }
92
93 static inline int32_t
cl_atomic_sub(IN atomic32_t * const p_value,IN const int32_t decrement)94 cl_atomic_sub(IN atomic32_t * const p_value, IN const int32_t decrement)
95 {
96 int32_t new_val;
97
98 cl_spinlock_acquire(&cl_atomic_spinlock);
99 new_val = *p_value - decrement;
100 *p_value = new_val;
101 cl_spinlock_release(&cl_atomic_spinlock);
102 return (new_val);
103 }
104
105 END_C_DECLS
106 #endif /* _CL_ATOMIC_OSD_H_ */
107