1 /*******************************************************************************
3 * Module Name: utmutex - local mutex support
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2006, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <acpi/acpi.h>
46 #define _COMPONENT ACPI_UTILITIES
47 ACPI_MODULE_NAME("utmutex")
49 /* Local prototypes */
50 static acpi_status
acpi_ut_create_mutex(acpi_mutex_handle mutex_id
);
52 static acpi_status
acpi_ut_delete_mutex(acpi_mutex_handle mutex_id
);
54 /*******************************************************************************
56 * FUNCTION: acpi_ut_mutex_initialize
62 * DESCRIPTION: Create the system mutex objects.
64 ******************************************************************************/
66 acpi_status
acpi_ut_mutex_initialize(void)
71 ACPI_FUNCTION_TRACE("ut_mutex_initialize");
74 * Create each of the predefined mutex objects
76 for (i
= 0; i
< NUM_MUTEX
; i
++) {
77 status
= acpi_ut_create_mutex(i
);
78 if (ACPI_FAILURE(status
)) {
79 return_ACPI_STATUS(status
);
83 status
= acpi_os_create_lock(&acpi_gbl_gpe_lock
);
84 return_ACPI_STATUS(status
);
87 /*******************************************************************************
89 * FUNCTION: acpi_ut_mutex_terminate
95 * DESCRIPTION: Delete all of the system mutex objects.
97 ******************************************************************************/
99 void acpi_ut_mutex_terminate(void)
103 ACPI_FUNCTION_TRACE("ut_mutex_terminate");
106 * Delete each predefined mutex object
108 for (i
= 0; i
< NUM_MUTEX
; i
++) {
109 (void)acpi_ut_delete_mutex(i
);
112 acpi_os_delete_lock(acpi_gbl_gpe_lock
);
116 /*******************************************************************************
118 * FUNCTION: acpi_ut_create_mutex
120 * PARAMETERS: mutex_iD - ID of the mutex to be created
124 * DESCRIPTION: Create a mutex object.
126 ******************************************************************************/
128 static acpi_status
acpi_ut_create_mutex(acpi_mutex_handle mutex_id
)
130 acpi_status status
= AE_OK
;
132 ACPI_FUNCTION_TRACE_U32("ut_create_mutex", mutex_id
);
134 if (mutex_id
> MAX_MUTEX
) {
135 return_ACPI_STATUS(AE_BAD_PARAMETER
);
138 if (!acpi_gbl_mutex_info
[mutex_id
].mutex
) {
139 status
= acpi_os_create_semaphore(1, 1,
142 acpi_gbl_mutex_info
[mutex_id
].thread_id
=
143 ACPI_MUTEX_NOT_ACQUIRED
;
144 acpi_gbl_mutex_info
[mutex_id
].use_count
= 0;
147 return_ACPI_STATUS(status
);
150 /*******************************************************************************
152 * FUNCTION: acpi_ut_delete_mutex
154 * PARAMETERS: mutex_iD - ID of the mutex to be deleted
158 * DESCRIPTION: Delete a mutex object.
160 ******************************************************************************/
162 static acpi_status
acpi_ut_delete_mutex(acpi_mutex_handle mutex_id
)
166 ACPI_FUNCTION_TRACE_U32("ut_delete_mutex", mutex_id
);
168 if (mutex_id
> MAX_MUTEX
) {
169 return_ACPI_STATUS(AE_BAD_PARAMETER
);
172 status
= acpi_os_delete_semaphore(acpi_gbl_mutex_info
[mutex_id
].mutex
);
174 acpi_gbl_mutex_info
[mutex_id
].mutex
= NULL
;
175 acpi_gbl_mutex_info
[mutex_id
].thread_id
= ACPI_MUTEX_NOT_ACQUIRED
;
177 return_ACPI_STATUS(status
);
180 /*******************************************************************************
182 * FUNCTION: acpi_ut_acquire_mutex
184 * PARAMETERS: mutex_iD - ID of the mutex to be acquired
188 * DESCRIPTION: Acquire a mutex object.
190 ******************************************************************************/
192 acpi_status
acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id
)
197 ACPI_FUNCTION_NAME("ut_acquire_mutex");
199 if (mutex_id
> MAX_MUTEX
) {
200 return (AE_BAD_PARAMETER
);
203 this_thread_id
= acpi_os_get_thread_id();
205 #ifdef ACPI_MUTEX_DEBUG
209 * Mutex debug code, for internal debugging only.
211 * Deadlock prevention. Check if this thread owns any mutexes of value
212 * greater than or equal to this one. If so, the thread has violated
213 * the mutex ordering rule. This indicates a coding error somewhere in
214 * the ACPI subsystem code.
216 for (i
= mutex_id
; i
< MAX_MUTEX
; i
++) {
217 if (acpi_gbl_mutex_info
[i
].thread_id
== this_thread_id
) {
219 ACPI_REPORT_ERROR(("Mutex [%s] already acquired by this thread [%X]\n", acpi_ut_get_mutex_name(mutex_id
), this_thread_id
));
221 return (AE_ALREADY_ACQUIRED
);
224 ACPI_REPORT_ERROR(("Invalid acquire order: Thread %X owns [%s], wants [%s]\n", this_thread_id
, acpi_ut_get_mutex_name(i
), acpi_ut_get_mutex_name(mutex_id
)));
226 return (AE_ACQUIRE_DEADLOCK
);
232 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
233 "Thread %X attempting to acquire Mutex [%s]\n",
234 this_thread_id
, acpi_ut_get_mutex_name(mutex_id
)));
236 status
= acpi_os_wait_semaphore(acpi_gbl_mutex_info
[mutex_id
].mutex
,
237 1, ACPI_WAIT_FOREVER
);
238 if (ACPI_SUCCESS(status
)) {
239 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
240 "Thread %X acquired Mutex [%s]\n",
242 acpi_ut_get_mutex_name(mutex_id
)));
244 acpi_gbl_mutex_info
[mutex_id
].use_count
++;
245 acpi_gbl_mutex_info
[mutex_id
].thread_id
= this_thread_id
;
247 ACPI_REPORT_ERROR(("Thread %X could not acquire Mutex [%X] %s\n", this_thread_id
, mutex_id
, acpi_format_exception(status
)));
253 /*******************************************************************************
255 * FUNCTION: acpi_ut_release_mutex
257 * PARAMETERS: mutex_iD - ID of the mutex to be released
261 * DESCRIPTION: Release a mutex object.
263 ******************************************************************************/
265 acpi_status
acpi_ut_release_mutex(acpi_mutex_handle mutex_id
)
270 ACPI_FUNCTION_NAME("ut_release_mutex");
272 this_thread_id
= acpi_os_get_thread_id();
273 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
274 "Thread %X releasing Mutex [%s]\n", this_thread_id
,
275 acpi_ut_get_mutex_name(mutex_id
)));
277 if (mutex_id
> MAX_MUTEX
) {
278 return (AE_BAD_PARAMETER
);
282 * Mutex must be acquired in order to release it!
284 if (acpi_gbl_mutex_info
[mutex_id
].thread_id
== ACPI_MUTEX_NOT_ACQUIRED
) {
285 ACPI_REPORT_ERROR(("Mutex [%X] is not acquired, cannot release\n", mutex_id
));
287 return (AE_NOT_ACQUIRED
);
289 #ifdef ACPI_MUTEX_DEBUG
293 * Mutex debug code, for internal debugging only.
295 * Deadlock prevention. Check if this thread owns any mutexes of value
296 * greater than this one. If so, the thread has violated the mutex
297 * ordering rule. This indicates a coding error somewhere in
298 * the ACPI subsystem code.
300 for (i
= mutex_id
; i
< MAX_MUTEX
; i
++) {
301 if (acpi_gbl_mutex_info
[i
].thread_id
== this_thread_id
) {
306 ACPI_REPORT_ERROR(("Invalid release order: owns [%s], releasing [%s]\n", acpi_ut_get_mutex_name(i
), acpi_ut_get_mutex_name(mutex_id
)));
308 return (AE_RELEASE_DEADLOCK
);
314 /* Mark unlocked FIRST */
316 acpi_gbl_mutex_info
[mutex_id
].thread_id
= ACPI_MUTEX_NOT_ACQUIRED
;
319 acpi_os_signal_semaphore(acpi_gbl_mutex_info
[mutex_id
].mutex
, 1);
321 if (ACPI_FAILURE(status
)) {
322 ACPI_REPORT_ERROR(("Thread %X could not release Mutex [%X] %s\n", this_thread_id
, mutex_id
, acpi_format_exception(status
)));
324 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
325 "Thread %X released Mutex [%s]\n",
327 acpi_ut_get_mutex_name(mutex_id
)));