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// Copyright 2013 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Multi-threaded worker
//
// Original source:
// http://git.chromium.org/webm/libwebp.git
// 100644 blob 13a61a4c84194c3374080cbf03d881d3cd6af40d src/utils/thread.h
#ifndef VP9_DECODER_VP9_THREAD_H_
#define VP9_DECODER_VP9_THREAD_H_
#include "vpx_config.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#if CONFIG_MULTITHREAD
#if defined(_WIN32)
#include <windows.h>
typedef HANDLE pthread_t;
typedef CRITICAL_SECTION pthread_mutex_t;
typedef struct {
HANDLE waiting_sem_;
HANDLE received_sem_;
HANDLE signal_event_;
} pthread_cond_t;
#else
#include <pthread.h>
#endif /* _WIN32 */
#endif /* CONFIG_MULTITHREAD */
// State of the worker thread object
typedef enum {
NOT_OK = 0, // object is unusable
OK, // ready to work
WORK // busy finishing the current task
} VP9WorkerStatus;
// Function to be called by the worker thread. Takes two opaque pointers as
// arguments (data1 and data2), and should return false in case of error.
typedef int (*VP9WorkerHook)(void*, void*);
// Synchronize object used to launch job in the worker thread
typedef struct {
#if CONFIG_MULTITHREAD
pthread_mutex_t mutex_;
pthread_cond_t condition_;
pthread_t thread_;
#endif
VP9WorkerStatus status_;
VP9WorkerHook hook; // hook to call
void* data1; // first argument passed to 'hook'
void* data2; // second argument passed to 'hook'
int had_error; // return value of the last call to 'hook'
} VP9Worker;
// Must be called first, before any other method.
void vp9_worker_init(VP9Worker* const worker);
// Must be called to initialize the object and spawn the thread. Re-entrant.
// Will potentially launch the thread. Returns false in case of error.
int vp9_worker_reset(VP9Worker* const worker);
// Makes sure the previous work is finished. Returns true if worker->had_error
// was not set and no error condition was triggered by the working thread.
int vp9_worker_sync(VP9Worker* const worker);
// Triggers the thread to call hook() with data1 and data2 argument. These
// hook/data1/data2 can be changed at any time before calling this function,
// but not be changed afterward until the next call to vp9_worker_sync().
void vp9_worker_launch(VP9Worker* const worker);
// Kill the thread and terminate the object. To use the object again, one
// must call vp9_worker_reset() again.
void vp9_worker_end(VP9Worker* const worker);
//------------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif
#endif /* VP9_DECODER_VP9_THREAD_H_ */
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