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1 // Copyright 2013 Google Inc. All Rights Reserved. | 1 // Copyright 2013 Google Inc. All Rights Reserved. |
2 // | 2 // |
3 // Use of this source code is governed by a BSD-style license | 3 // Use of this source code is governed by a BSD-style license |
4 // that can be found in the COPYING file in the root of the source | 4 // that can be found in the COPYING file in the root of the source |
5 // tree. An additional intellectual property rights grant can be found | 5 // tree. An additional intellectual property rights grant can be found |
6 // in the file PATENTS. All contributing project authors may | 6 // in the file PATENTS. All contributing project authors may |
7 // be found in the AUTHORS file in the root of the source tree. | 7 // be found in the AUTHORS file in the root of the source tree. |
8 // ----------------------------------------------------------------------------- | 8 // ----------------------------------------------------------------------------- |
9 // | 9 // |
10 // Multi-threaded worker | 10 // Multi-threaded worker |
11 // | 11 // |
12 // Original source: | 12 // Original source: |
13 // http://git.chromium.org/webm/libwebp.git | 13 // http://git.chromium.org/webm/libwebp.git |
14 // 100644 blob 13a61a4c84194c3374080cbf03d881d3cd6af40d src/utils/thread.h | 14 // 100644 blob 7bd451b124ae3b81596abfbcc823e3cb129d3a38 src/utils/thread.h |
15 | |
16 | 15 |
17 #ifndef VP9_DECODER_VP9_THREAD_H_ | 16 #ifndef VP9_DECODER_VP9_THREAD_H_ |
18 #define VP9_DECODER_VP9_THREAD_H_ | 17 #define VP9_DECODER_VP9_THREAD_H_ |
19 | 18 |
20 #include "./vpx_config.h" | 19 #include "./vpx_config.h" |
21 | 20 |
22 #ifdef __cplusplus | 21 #ifdef __cplusplus |
23 extern "C" { | 22 extern "C" { |
24 #endif | 23 #endif |
25 | 24 |
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156 typedef enum { | 155 typedef enum { |
157 NOT_OK = 0, // object is unusable | 156 NOT_OK = 0, // object is unusable |
158 OK, // ready to work | 157 OK, // ready to work |
159 WORK // busy finishing the current task | 158 WORK // busy finishing the current task |
160 } VP9WorkerStatus; | 159 } VP9WorkerStatus; |
161 | 160 |
162 // Function to be called by the worker thread. Takes two opaque pointers as | 161 // Function to be called by the worker thread. Takes two opaque pointers as |
163 // arguments (data1 and data2), and should return false in case of error. | 162 // arguments (data1 and data2), and should return false in case of error. |
164 typedef int (*VP9WorkerHook)(void*, void*); | 163 typedef int (*VP9WorkerHook)(void*, void*); |
165 | 164 |
166 // Synchronize object used to launch job in the worker thread | 165 // Platform-dependent implementation details for the worker. |
| 166 typedef struct VP9WorkerImpl VP9WorkerImpl; |
| 167 |
| 168 // Synchronization object used to launch job in the worker thread |
167 typedef struct { | 169 typedef struct { |
168 #if CONFIG_MULTITHREAD | 170 VP9WorkerImpl *impl_; |
169 pthread_mutex_t mutex_; | |
170 pthread_cond_t condition_; | |
171 pthread_t thread_; | |
172 #endif | |
173 VP9WorkerStatus status_; | 171 VP9WorkerStatus status_; |
174 VP9WorkerHook hook; // hook to call | 172 VP9WorkerHook hook; // hook to call |
175 void* data1; // first argument passed to 'hook' | 173 void *data1; // first argument passed to 'hook' |
176 void* data2; // second argument passed to 'hook' | 174 void *data2; // second argument passed to 'hook' |
177 int had_error; // return value of the last call to 'hook' | 175 int had_error; // return value of the last call to 'hook' |
178 } VP9Worker; | 176 } VP9Worker; |
179 | 177 |
180 // Must be called first, before any other method. | 178 // The interface for all thread-worker related functions. All these functions |
181 void vp9_worker_init(VP9Worker* const worker); | 179 // must be implemented. |
182 // Must be called to initialize the object and spawn the thread. Re-entrant. | 180 typedef struct { |
183 // Will potentially launch the thread. Returns false in case of error. | 181 // Must be called first, before any other method. |
184 int vp9_worker_reset(VP9Worker* const worker); | 182 void (*init)(VP9Worker *const worker); |
185 // Makes sure the previous work is finished. Returns true if worker->had_error | 183 // Must be called to initialize the object and spawn the thread. Re-entrant. |
186 // was not set and no error condition was triggered by the working thread. | 184 // Will potentially launch the thread. Returns false in case of error. |
187 int vp9_worker_sync(VP9Worker* const worker); | 185 int (*reset)(VP9Worker *const worker); |
188 // Triggers the thread to call hook() with data1 and data2 argument. These | 186 // Makes sure the previous work is finished. Returns true if worker->had_error |
189 // hook/data1/data2 can be changed at any time before calling this function, | 187 // was not set and no error condition was triggered by the working thread. |
190 // but not be changed afterward until the next call to vp9_worker_sync(). | 188 int (*sync)(VP9Worker *const worker); |
191 void vp9_worker_launch(VP9Worker* const worker); | 189 // Triggers the thread to call hook() with data1 and data2 arguments. These |
192 // This function is similar to vp9_worker_launch() except that it calls the | 190 // hook/data1/data2 values can be changed at any time before calling this |
193 // hook directly instead of using a thread. Convenient to bypass the thread | 191 // function, but not be changed afterward until the next call to Sync(). |
194 // mechanism while still using the VP9Worker structs. vp9_worker_sync() must | 192 void (*launch)(VP9Worker *const worker); |
195 // still be called afterward (for error reporting). | 193 // This function is similar to launch() except that it calls the |
196 void vp9_worker_execute(VP9Worker* const worker); | 194 // hook directly instead of using a thread. Convenient to bypass the thread |
197 // Kill the thread and terminate the object. To use the object again, one | 195 // mechanism while still using the VP9Worker structs. sync() must |
198 // must call vp9_worker_reset() again. | 196 // still be called afterward (for error reporting). |
199 void vp9_worker_end(VP9Worker* const worker); | 197 void (*execute)(VP9Worker *const worker); |
| 198 // Kill the thread and terminate the object. To use the object again, one |
| 199 // must call reset() again. |
| 200 void (*end)(VP9Worker *const worker); |
| 201 } VP9WorkerInterface; |
| 202 |
| 203 // Install a new set of threading functions, overriding the defaults. This |
| 204 // should be done before any workers are started, i.e., before any encoding or |
| 205 // decoding takes place. The contents of the interface struct are copied, it |
| 206 // is safe to free the corresponding memory after this call. This function is |
| 207 // not thread-safe. Return false in case of invalid pointer or methods. |
| 208 int vp9_set_worker_interface(const VP9WorkerInterface *const winterface); |
| 209 |
| 210 // Retrieve the currently set thread worker interface. |
| 211 const VP9WorkerInterface *vp9_get_worker_interface(void); |
200 | 212 |
201 //------------------------------------------------------------------------------ | 213 //------------------------------------------------------------------------------ |
202 | 214 |
203 #ifdef __cplusplus | 215 #ifdef __cplusplus |
204 } // extern "C" | 216 } // extern "C" |
205 #endif | 217 #endif |
206 | 218 |
207 #endif // VP9_DECODER_VP9_THREAD_H_ | 219 #endif // VP9_DECODER_VP9_THREAD_H_ |
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