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1 | /** |
2 | * @file IxEthAccDBLocks_p.h | |
3 | * | |
4 | * @brief Definition of transaction lock stacks and lock utility macros | |
5 | * | |
6 | * @par | |
7 | * IXP400 SW Release version 2.0 | |
8 | * | |
9 | * -- Copyright Notice -- | |
10 | * | |
11 | * @par | |
12 | * Copyright 2001-2005, Intel Corporation. | |
13 | * All rights reserved. | |
14 | * | |
15 | * @par | |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
24 | * 3. Neither the name of the Intel Corporation nor the names of its contributors | |
25 | * may be used to endorse or promote products derived from this software | |
26 | * without specific prior written permission. | |
27 | * | |
28 | * @par | |
29 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' | |
30 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
31 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
32 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE | |
33 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
34 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
35 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
36 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
37 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
38 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
39 | * SUCH DAMAGE. | |
40 | * | |
41 | * @par | |
42 | * -- End of Copyright Notice -- | |
43 | */ | |
44 | ||
45 | #ifndef IxEthAccDBLocks_p_H | |
46 | #define IxEthAccDBLocks_p_H | |
47 | ||
48 | #include "IxOsPrintf.h" | |
49 | ||
50 | /* Lock and lock stacks */ | |
51 | typedef struct | |
52 | { | |
53 | IxOsalFastMutex* locks[MAX_LOCKS]; | |
54 | UINT32 stackPointer, basePointer; | |
55 | } LockStack; | |
56 | ||
57 | #define TRY_LOCK(mutex) \ | |
58 | { \ | |
59 | if (ixOsalFastMutexTryLock(mutex) != IX_SUCCESS) \ | |
60 | { \ | |
61 | return IX_ETH_DB_BUSY; \ | |
62 | } \ | |
63 | } | |
64 | ||
65 | ||
66 | #define UNLOCK(mutex) { ixOsalFastMutexUnlock(mutex); } | |
67 | ||
68 | #define INIT_STACK(stack) \ | |
69 | { \ | |
70 | (stack)->basePointer = 0; \ | |
71 | (stack)->stackPointer = 0; \ | |
72 | } | |
73 | ||
74 | #define PUSH_LOCK(stack, lock) \ | |
75 | { \ | |
76 | if ((stack)->stackPointer == MAX_LOCKS) \ | |
77 | { \ | |
78 | ERROR_LOG("Ethernet DB: maximum number of elements in a lock stack has been exceeded on push, heavy chaining?\n"); \ | |
79 | UNROLL_STACK(stack); \ | |
80 | \ | |
81 | return IX_ETH_DB_NOMEM; \ | |
82 | } \ | |
83 | \ | |
84 | if (ixOsalFastMutexTryLock(lock) == IX_SUCCESS) \ | |
85 | { \ | |
86 | (stack)->locks[(stack)->stackPointer++] = (lock); \ | |
87 | } \ | |
88 | else \ | |
89 | { \ | |
90 | UNROLL_STACK(stack); \ | |
91 | \ | |
92 | return IX_ETH_DB_BUSY; \ | |
93 | } \ | |
94 | } | |
95 | ||
96 | #define POP_LOCK(stack) \ | |
97 | { \ | |
98 | ixOsalFastMutexUnlock((stack)->locks[--(stack)->stackPointer]); \ | |
99 | } | |
100 | ||
101 | #define UNROLL_STACK(stack) \ | |
102 | { \ | |
103 | while ((stack)->stackPointer > (stack)->basePointer) \ | |
104 | { \ | |
105 | POP_LOCK(stack); \ | |
106 | } \ | |
107 | } | |
108 | ||
109 | #define SHIFT_STACK(stack) \ | |
110 | { \ | |
111 | if ((stack)->basePointer == MAX_LOCKS - 1) \ | |
112 | { \ | |
113 | ERROR_LOG("Ethernet DB: maximum number of elements in a lock stack has been exceeded on shift, heavy chaining?\n"); \ | |
114 | UNROLL_STACK(stack); \ | |
115 | \ | |
116 | return IX_ETH_DB_BUSY; \ | |
117 | } \ | |
118 | \ | |
119 | ixOsalFastMutexUnlock((stack)->locks[(stack)->basePointer++]); \ | |
120 | } | |
121 | ||
122 | #endif /* IxEthAccDBLocks_p_H */ |