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| 1 /* Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 /* Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 * Use of this source code is governed by a BSD-style license that can be | 2 * Use of this source code is governed by a BSD-style license that can be |
| 3 * found in the LICENSE file. | 3 * found in the LICENSE file. |
| 4 */ | 4 */ |
| 5 | 5 |
| 6 /* From ppb_message_loop.idl modified Mon Apr 1 12:14:25 2013. */ | 6 /* From ppb_message_loop.idl modified Thu May 9 14:59:57 2013. */ |
| 7 | 7 |
| 8 #ifndef PPAPI_C_PPB_MESSAGE_LOOP_H_ | 8 #ifndef PPAPI_C_PPB_MESSAGE_LOOP_H_ |
| 9 #define PPAPI_C_PPB_MESSAGE_LOOP_H_ | 9 #define PPAPI_C_PPB_MESSAGE_LOOP_H_ |
| 10 | 10 |
| 11 #include "ppapi/c/pp_bool.h" | 11 #include "ppapi/c/pp_bool.h" |
| 12 #include "ppapi/c/pp_completion_callback.h" | 12 #include "ppapi/c/pp_completion_callback.h" |
| 13 #include "ppapi/c/pp_instance.h" | 13 #include "ppapi/c/pp_instance.h" |
| 14 #include "ppapi/c/pp_macros.h" | 14 #include "ppapi/c/pp_macros.h" |
| 15 #include "ppapi/c/pp_resource.h" | 15 #include "ppapi/c/pp_resource.h" |
| 16 #include "ppapi/c/pp_stdint.h" | 16 #include "ppapi/c/pp_stdint.h" |
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| 48 * - Create the thread yourself (using pthreads). | 48 * - Create the thread yourself (using pthreads). |
| 49 * - Create the message loop resource. | 49 * - Create the message loop resource. |
| 50 * - Pass the message loop resource to your thread's main function. | 50 * - Pass the message loop resource to your thread's main function. |
| 51 * - Call PostWork() on the message loop to run functions on the thread. | 51 * - Call PostWork() on the message loop to run functions on the thread. |
| 52 * | 52 * |
| 53 * From the background thread's main function: | 53 * From the background thread's main function: |
| 54 * - Call AttachToCurrentThread() with the message loop resource. | 54 * - Call AttachToCurrentThread() with the message loop resource. |
| 55 * - Call Run() with the message loop resource. | 55 * - Call Run() with the message loop resource. |
| 56 * | 56 * |
| 57 * Your callbacks should look like this: | 57 * Your callbacks should look like this: |
| 58 * @code | 58 * @code |
| 59 * void DoMyWork(void* user_data, int32_t status) { | 59 * void DoMyWork(void* user_data, int32_t status) { |
| 60 * if (status != PP_OK) { | 60 * if (status != PP_OK) { |
| 61 * Cleanup(); // e.g. free user_data. | 61 * Cleanup(); // e.g. free user_data. |
| 62 * return; | 62 * return; |
| 63 * } | 63 * } |
| 64 * ... do your work... | 64 * ... do your work... |
| 65 * } | 65 * } |
| 66 * @endcode | 66 * @endcode |
| 67 * For a C++ example, see ppapi/utility/threading/simple_thread.h | 67 * For a C++ example, see ppapi/utility/threading/simple_thread.h |
| 68 * | 68 * |
| 69 * (You can also create the message loop resource on the background thread, | 69 * (You can also create the message loop resource on the background thread, |
| 70 * but then the main thread will have no reference to it should you want to | 70 * but then the main thread will have no reference to it should you want to |
| 71 * call PostWork()). | 71 * call PostWork()). |
| 72 * | 72 * |
| 73 * | 73 * |
| 74 * THREAD HANDLING | 74 * THREAD HANDLING |
| 75 * | 75 * |
| 76 * The main thread has an implicitly created message loop. The main thread is | 76 * The main thread has an implicitly created message loop. The main thread is |
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| 127 * | 127 * |
| 128 * If you post a callback to a message loop that's been destroyed, or to an | 128 * If you post a callback to a message loop that's been destroyed, or to an |
| 129 * invalid message loop, PostWork will return an error and will not run the | 129 * invalid message loop, PostWork will return an error and will not run the |
| 130 * callback. This is true even for callbacks with the "required" flag set, | 130 * callback. This is true even for callbacks with the "required" flag set, |
| 131 * since the system may not even know what thread to issue the error callback | 131 * since the system may not even know what thread to issue the error callback |
| 132 * on. | 132 * on. |
| 133 * | 133 * |
| 134 * Therefore, you should check for errors from PostWork and destroy any | 134 * Therefore, you should check for errors from PostWork and destroy any |
| 135 * associated memory to avoid leaks. If you're using the C++ | 135 * associated memory to avoid leaks. If you're using the C++ |
| 136 * CompletionCallbackFactory, use the following pattern: | 136 * CompletionCallbackFactory, use the following pattern: |
| 137 * | 137 * @code |
| 138 * pp::CompletionCallback callback = factory_.NewOptionalCallback(...); | 138 * pp::CompletionCallback callback = factory_.NewOptionalCallback(...); |
| 139 * int32_t result = message_loop.PostWork(callback); | 139 * int32_t result = message_loop.PostWork(callback); |
| 140 * if (result != PP_OK) | 140 * if (result != PP_OK) |
| 141 * callback.Run(result); | 141 * callback.Run(result); |
| 142 * | 142 * @endcode |
| 143 * This will run the callback with an error value, and assumes that the | 143 * This will run the callback with an error value, and assumes that the |
| 144 * implementation of your callback checks the "result" argument and returns | 144 * implementation of your callback checks the "result" argument and returns |
| 145 * immediately on error. | 145 * immediately on error. |
| 146 */ | 146 */ |
| 147 struct PPB_MessageLoop_1_0 { | 147 struct PPB_MessageLoop_1_0 { |
| 148 /** | 148 /** |
| 149 * Creates a message loop resource. | 149 * Creates a message loop resource. |
| 150 * | 150 * |
| 151 * This may be called from any thread. After your thread starts but before | 151 * This may be called from any thread. After your thread starts but before |
| 152 * issuing any other PPAPI calls on it, you must associate it with a message | 152 * issuing any other PPAPI calls on it, you must associate it with a message |
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| 282 int32_t (*PostQuit)(PP_Resource message_loop, PP_Bool should_destroy); | 282 int32_t (*PostQuit)(PP_Resource message_loop, PP_Bool should_destroy); |
| 283 }; | 283 }; |
| 284 | 284 |
| 285 typedef struct PPB_MessageLoop_1_0 PPB_MessageLoop; | 285 typedef struct PPB_MessageLoop_1_0 PPB_MessageLoop; |
| 286 /** | 286 /** |
| 287 * @} | 287 * @} |
| 288 */ | 288 */ |
| 289 | 289 |
| 290 #endif /* PPAPI_C_PPB_MESSAGE_LOOP_H_ */ | 290 #endif /* PPAPI_C_PPB_MESSAGE_LOOP_H_ */ |
| 291 | 291 |
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