86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
// 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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#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 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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// Make sure the previous work is finished. Returns true if worker->had_error
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// was not set and not error condition was triggered by the working thread.
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int WebPWorkerSync(WebPWorker* const worker);
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// Trigger 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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