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Open Source Computer Vision Library
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90 lines
2.8 KiB
90 lines
2.8 KiB
// Copyright 2011 Google Inc. All Rights Reserved. |
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// |
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// This code is licensed under the same terms as WebM: |
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// Software License Agreement: http://www.webmproject.org/license/software/ |
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ |
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// ----------------------------------------------------------------------------- |
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// |
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// Multi-threaded worker |
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// |
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// Author: Skal (pascal.massimino@gmail.com) |
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#ifndef WEBP_UTILS_THREAD_H_ |
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#define WEBP_UTILS_THREAD_H_ |
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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#if defined(__cplusplus) || defined(c_plusplus) |
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extern "C" { |
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#endif |
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#if WEBP_USE_THREAD |
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#if defined(_WIN32) |
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#include <windows.h> |
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typedef HANDLE pthread_t; |
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typedef CRITICAL_SECTION pthread_mutex_t; |
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typedef struct { |
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HANDLE waiting_sem_; |
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HANDLE received_sem_; |
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HANDLE signal_event_; |
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} pthread_cond_t; |
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#else |
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#include <pthread.h> |
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#endif /* _WIN32 */ |
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#endif /* WEBP_USE_THREAD */ |
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// State of the worker thread object |
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typedef enum { |
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NOT_OK = 0, // object is unusable |
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OK, // ready to work |
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WORK // busy finishing the current task |
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} WebPWorkerStatus; |
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// Function to be called by the worker thread. Takes two opaque pointers as |
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// arguments (data1 and data2), and should return false in case of error. |
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typedef int (*WebPWorkerHook)(void*, void*); |
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// Synchronize object used to launch job in the worker thread |
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typedef struct { |
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#if WEBP_USE_THREAD |
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pthread_mutex_t mutex_; |
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pthread_cond_t condition_; |
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pthread_t thread_; |
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#endif |
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WebPWorkerStatus status_; |
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WebPWorkerHook hook; // hook to call |
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void* data1; // first argument passed to 'hook' |
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void* data2; // second argument passed to 'hook' |
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int had_error; // return value of the last call to 'hook' |
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} WebPWorker; |
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// Must be called first, before any other method. |
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void WebPWorkerInit(WebPWorker* const worker); |
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// Must be called to initialize the object and spawn the thread. Re-entrant. |
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// Will potentially launch the thread. Returns false in case of error. |
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int WebPWorkerReset(WebPWorker* const worker); |
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// Makes sure the previous work is finished. Returns true if worker->had_error |
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// was not set and no error condition was triggered by the working thread. |
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int WebPWorkerSync(WebPWorker* const worker); |
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// Triggers the thread to call hook() with data1 and data2 argument. These |
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// hook/data1/data2 can be changed at any time before calling this function, |
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// but not be changed afterward until the next call to WebPWorkerSync(). |
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void WebPWorkerLaunch(WebPWorker* const worker); |
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// Kill the thread and terminate the object. To use the object again, one |
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// must call WebPWorkerReset() again. |
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void WebPWorkerEnd(WebPWorker* const worker); |
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//------------------------------------------------------------------------------ |
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#if defined(__cplusplus) || defined(c_plusplus) |
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} // extern "C" |
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#endif |
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#endif /* WEBP_UTILS_THREAD_H_ */
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