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1 | /** |
2 | * @file IxOsalOsSemaphore.c (eCos) | |
3 | * | |
4 | * @brief Implementation for semaphore and mutex. | |
5 | * | |
6 | * | |
7 | * @par | |
8 | * IXP400 SW Release version 1.5 | |
9 | * | |
10 | * -- Copyright Notice -- | |
11 | * | |
12 | * @par | |
13 | * Copyright 2001-2005, Intel Corporation. | |
14 | * All rights reserved. | |
15 | * | |
16 | * @par | |
17 | * Redistribution and use in source and binary forms, with or without | |
18 | * modification, are permitted provided that the following conditions | |
19 | * are met: | |
20 | * 1. Redistributions of source code must retain the above copyright | |
21 | * notice, this list of conditions and the following disclaimer. | |
22 | * 2. Redistributions in binary form must reproduce the above copyright | |
23 | * notice, this list of conditions and the following disclaimer in the | |
24 | * documentation and/or other materials provided with the distribution. | |
25 | * 3. Neither the name of the Intel Corporation nor the names of its contributors | |
26 | * may be used to endorse or promote products derived from this software | |
27 | * without specific prior written permission. | |
28 | * | |
29 | * @par | |
30 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' | |
31 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
32 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
33 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE | |
34 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
35 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
36 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
37 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
38 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
39 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
40 | * SUCH DAMAGE. | |
41 | * | |
42 | * @par | |
43 | * -- End of Copyright Notice -- | |
44 | */ | |
45 | ||
46 | #include "IxOsal.h" | |
47 | #include "IxNpeMhReceive_p.h" | |
48 | ||
49 | /* Define a large number */ | |
50 | #define IX_OSAL_MAX_LONG (0x7FFFFFFF) | |
51 | ||
52 | /* Max timeout in MS, used to guard against possible overflow */ | |
53 | #define IX_OSAL_MAX_TIMEOUT_MS (IX_OSAL_MAX_LONG/HZ) | |
54 | ||
55 | ||
56 | PUBLIC IX_STATUS | |
57 | ixOsalSemaphoreInit (IxOsalSemaphore * sid, UINT32 start_value) | |
58 | { | |
59 | diag_printf("%s called\n", __FUNCTION__); | |
60 | return IX_SUCCESS; | |
61 | } | |
62 | ||
63 | /** | |
64 | * DESCRIPTION: If the semaphore is 'empty', the calling thread is blocked. | |
65 | * If the semaphore is 'full', it is taken and control is returned | |
66 | * to the caller. If the time indicated in 'timeout' is reached, | |
67 | * the thread will unblock and return an error indication. If the | |
68 | * timeout is set to 'IX_OSAL_WAIT_NONE', the thread will never block; | |
69 | * if it is set to 'IX_OSAL_WAIT_FOREVER', the thread will block until | |
70 | * the semaphore is available. | |
71 | * | |
72 | * | |
73 | */ | |
74 | ||
75 | ||
76 | PUBLIC IX_STATUS | |
77 | ixOsalSemaphoreWait (IxOsalOsSemaphore * sid, INT32 timeout) | |
78 | { | |
79 | diag_printf("%s called\n", __FUNCTION__); | |
80 | return IX_SUCCESS; | |
81 | } | |
82 | ||
83 | /* | |
84 | * Attempt to get semaphore, return immediately, | |
85 | * no error info because users expect some failures | |
86 | * when using this API. | |
87 | */ | |
88 | PUBLIC IX_STATUS | |
89 | ixOsalSemaphoreTryWait (IxOsalSemaphore * sid) | |
90 | { | |
91 | diag_printf("%s called\n", __FUNCTION__); | |
92 | return IX_FAIL; | |
93 | } | |
94 | ||
95 | /** | |
96 | * | |
97 | * DESCRIPTION: This function causes the next available thread in the pend queue | |
98 | * to be unblocked. If no thread is pending on this semaphore, the | |
99 | * semaphore becomes 'full'. | |
100 | */ | |
101 | PUBLIC IX_STATUS | |
102 | ixOsalSemaphorePost (IxOsalSemaphore * sid) | |
103 | { | |
104 | diag_printf("%s called\n", __FUNCTION__); | |
105 | return IX_SUCCESS; | |
106 | } | |
107 | ||
108 | PUBLIC IX_STATUS | |
109 | ixOsalSemaphoreGetValue (IxOsalSemaphore * sid, UINT32 * value) | |
110 | { | |
111 | diag_printf("%s called\n", __FUNCTION__); | |
112 | return IX_FAIL; | |
113 | } | |
114 | ||
115 | PUBLIC IX_STATUS | |
116 | ixOsalSemaphoreDestroy (IxOsalSemaphore * sid) | |
117 | { | |
118 | diag_printf("%s called\n", __FUNCTION__); | |
119 | return IX_FAIL; | |
120 | } | |
121 | ||
122 | /**************************** | |
123 | * Mutex | |
124 | ****************************/ | |
125 | ||
126 | static void drv_mutex_init(IxOsalMutex *mutex) | |
127 | { | |
128 | *mutex = 0; | |
129 | } | |
130 | ||
131 | static void drv_mutex_destroy(IxOsalMutex *mutex) | |
132 | { | |
133 | *mutex = -1; | |
134 | } | |
135 | ||
136 | static int drv_mutex_trylock(IxOsalMutex *mutex) | |
137 | { | |
472d5460 | 138 | int result = true; |
ba94a1bb WD |
139 | |
140 | if (*mutex == 1) | |
472d5460 | 141 | result = false; |
ba94a1bb WD |
142 | |
143 | return result; | |
144 | } | |
145 | ||
146 | static void drv_mutex_unlock(IxOsalMutex *mutex) | |
147 | { | |
148 | if (*mutex == 1) | |
149 | printf("Trying to unlock unlocked mutex!"); | |
150 | ||
151 | *mutex = 0; | |
152 | } | |
153 | ||
154 | PUBLIC IX_STATUS | |
155 | ixOsalMutexInit (IxOsalMutex * mutex) | |
156 | { | |
157 | drv_mutex_init(mutex); | |
158 | return IX_SUCCESS; | |
159 | } | |
160 | ||
161 | PUBLIC IX_STATUS | |
162 | ixOsalMutexLock (IxOsalMutex * mutex, INT32 timeout) | |
163 | { | |
164 | int tries; | |
165 | ||
166 | if (timeout == IX_OSAL_WAIT_NONE) { | |
167 | if (drv_mutex_trylock(mutex)) | |
168 | return IX_SUCCESS; | |
169 | else | |
170 | return IX_FAIL; | |
171 | } | |
172 | ||
173 | tries = (timeout * 1000) / 50; | |
174 | while (1) { | |
175 | if (drv_mutex_trylock(mutex)) | |
176 | return IX_SUCCESS; | |
177 | if (timeout != IX_OSAL_WAIT_FOREVER && tries-- <= 0) | |
178 | break; | |
179 | udelay(50); | |
180 | } | |
181 | return IX_FAIL; | |
182 | } | |
183 | ||
184 | PUBLIC IX_STATUS | |
185 | ixOsalMutexUnlock (IxOsalMutex * mutex) | |
186 | { | |
187 | drv_mutex_unlock(mutex); | |
188 | return IX_SUCCESS; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Attempt to get mutex, return immediately, | |
193 | * no error info because users expect some failures | |
194 | * when using this API. | |
195 | */ | |
196 | PUBLIC IX_STATUS | |
197 | ixOsalMutexTryLock (IxOsalMutex * mutex) | |
198 | { | |
199 | if (drv_mutex_trylock(mutex)) | |
200 | return IX_SUCCESS; | |
201 | return IX_FAIL; | |
202 | } | |
203 | ||
204 | PUBLIC IX_STATUS | |
205 | ixOsalMutexDestroy (IxOsalMutex * mutex) | |
206 | { | |
207 | drv_mutex_destroy(mutex); | |
208 | return IX_SUCCESS; | |
209 | } | |
210 | ||
211 | PUBLIC IX_STATUS | |
212 | ixOsalFastMutexInit (IxOsalFastMutex * mutex) | |
213 | { | |
214 | return ixOsalMutexInit(mutex); | |
215 | } | |
216 | ||
217 | PUBLIC IX_STATUS ixOsalFastMutexTryLock(IxOsalFastMutex *mutex) | |
218 | { | |
219 | return ixOsalMutexTryLock(mutex); | |
220 | } | |
221 | ||
222 | ||
223 | PUBLIC IX_STATUS | |
224 | ixOsalFastMutexUnlock (IxOsalFastMutex * mutex) | |
225 | { | |
226 | return ixOsalMutexUnlock(mutex); | |
227 | } | |
228 | ||
229 | PUBLIC IX_STATUS | |
230 | ixOsalFastMutexDestroy (IxOsalFastMutex * mutex) | |
231 | { | |
232 | return ixOsalMutexDestroy(mutex); | |
233 | } |