1 /*
2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 * conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 * of conditions and the following disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 * to endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifndef _LOS_CIRBUF_PRI_H
33 #define _LOS_CIRBUF_PRI_H
34
35 #include "los_typedef.h"
36 #include "los_spinlock.h"
37
38 #ifdef __cplusplus
39 #if __cplusplus
40 extern "C" {
41 #endif /* __cplusplus */
42 #endif /* __cplusplus */
43
44 typedef enum {
45 CBUF_UNUSED,
46 CBUF_USED
47 } CirBufStatus;
48
49 typedef struct {
50 UINT32 startIdx;
51 UINT32 endIdx;
52 UINT32 size;
53 UINT32 remain;
54 SPIN_LOCK_S lock;
55 CirBufStatus status;
56 CHAR *fifo;
57 } CirBuf;
58
LOS_CirBufLock(CirBuf * cirbufCB,UINT32 * intSave)59 STATIC INLINE VOID LOS_CirBufLock(CirBuf *cirbufCB, UINT32 *intSave)
60 {
61 if (cirbufCB == NULL) {
62 return;
63 }
64 LOS_SpinLockSave(&cirbufCB->lock, intSave);
65 }
66
LOS_CirBufUnlock(CirBuf * cirbufCB,UINT32 intSave)67 STATIC INLINE VOID LOS_CirBufUnlock(CirBuf *cirbufCB, UINT32 intSave)
68 {
69 if (cirbufCB == NULL) {
70 return;
71 }
72 LOS_SpinUnlockRestore(&cirbufCB->lock, intSave);
73 }
74
75 extern UINT32 LOS_CirBufInit(CirBuf *cirbufCB, CHAR *fifo, UINT32 size);
76 extern VOID LOS_CirBufDeinit(CirBuf *cirbufCB);
77 extern UINT32 LOS_CirBufWrite(CirBuf *cirbufCB, const CHAR *buf, UINT32 size);
78 extern UINT32 LOS_CirBufRead(CirBuf *cirbufCB, CHAR *buf, UINT32 size);
79 extern UINT32 LOS_CirBufUsedSize(CirBuf *cirbufCB);
80
81 #ifdef __cplusplus
82 #if __cplusplus
83 }
84 #endif /* __cplusplus */
85 #endif /* __cplusplus */
86
87 #endif /* _LOS_CIRBUF_PRI_H */
88