1 /* ----------------------------------------------------------------------------
2 * Copyright (c) Huawei Technologies Co., Ltd. 2021-2021. All rights reserved.
3 * Description: LiteOS USB Driver Config Data Stream HeadFile
4 * Author: Yannik Li
5 * Create: 2021-02-21
6 * Redistribution and use in source and binary forms, with or without modification,
7 * are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 * conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
11 * of conditions and the following disclaimer in the documentation and/or other materials
12 * provided with the distribution.
13 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
14 * to endorse or promote products derived from this software without specific prior written
15 * permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
18 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 * --------------------------------------------------------------------------- */
28 /* ----------------------------------------------------------------------------
29 * Notice of Export Control Law
30 * ===============================================
31 * Huawei LiteOS may be subject to applicable export control laws and regulations, which might
32 * include those applicable to Huawei LiteOS of U.S. and the country in which you are located.
33 * Import, export and usage of Huawei LiteOS in any manner by you shall be in compliance with such
34 * applicable export control laws and regulations.
35 * --------------------------------------------------------------------------- */
36
37 #ifndef LITEOS_OBJ_REF_H
38 #define LITEOS_OBJ_REF_H
39
40 /************************************************************************************
41 * Included Files
42 ************************************************************************************/
43
44 #include "gadget/usbdev.h"
45 #include "asm/atomic.h"
46 #include <linux/spinlock.h>
47 #include <linux/list.h>
48
49 /************************************************************************************
50 * Public Functions
51 ************************************************************************************/
52
53 #ifdef __cplusplus
54 #if __cplusplus
55 //extern "C" {
56 #endif /* __cplusplus */
57 #endif /* __cplusplus */
58
59 struct obj_ref {
60 atomic_t refcount;
61 };
62
objref_init(struct obj_ref * ref,int val)63 static inline void objref_init(struct obj_ref *ref, int val)
64 {
65 atomic_set(&ref->refcount, val);
66 }
67
objref_get(struct obj_ref * ref)68 static inline void objref_get(struct obj_ref *ref)
69 {
70 atomic_inc(&ref->refcount);
71 }
72
objref_put(struct obj_ref * ref,void (* release)(struct obj_ref * ref))73 static inline int objref_put(struct obj_ref *ref, void (*release)(struct obj_ref *ref))
74 {
75 if (atomic_dec_and_test(&ref->refcount))
76 {
77 release(ref);
78 return 1;
79 }
80 return 0;
81 }
82
objref_read(struct obj_ref * ref)83 static inline uint32_t objref_read(struct obj_ref *ref)
84 {
85 return atomic_read(&ref->refcount);
86 }
87
88 #ifdef __cplusplus
89 #if __cplusplus
90 //}
91 #endif /* __cplusplus */
92 #endif /* __cplusplus */
93
94 #endif /* LITEOS_OBJ_REF_H */
95