mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
2.8 KiB
86 lines
2.8 KiB
// Copyright 2011 Google Inc. All Rights Reserved. |
|
// |
|
// This code is licensed under the same terms as WebM: |
|
// Software License Agreement: http://www.webmproject.org/license/software/ |
|
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ |
|
// ----------------------------------------------------------------------------- |
|
// |
|
// Multi-threaded worker |
|
// |
|
// Author: Skal (pascal.massimino@gmail.com) |
|
|
|
#ifndef WEBP_UTILS_THREAD_H_ |
|
#define WEBP_UTILS_THREAD_H_ |
|
|
|
#if defined(__cplusplus) || defined(c_plusplus) |
|
extern "C" { |
|
#endif |
|
|
|
#if WEBP_USE_THREAD |
|
|
|
#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 /* WEBP_USE_THREAD */ |
|
|
|
// State of the worker thread object |
|
typedef enum { |
|
NOT_OK = 0, // object is unusable |
|
OK, // ready to work |
|
WORK // busy finishing the current task |
|
} WebPWorkerStatus; |
|
|
|
// 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 (*WebPWorkerHook)(void*, void*); |
|
|
|
// Synchronize object used to launch job in the worker thread |
|
typedef struct { |
|
#if WEBP_USE_THREAD |
|
pthread_mutex_t mutex_; |
|
pthread_cond_t condition_; |
|
pthread_t thread_; |
|
#endif |
|
WebPWorkerStatus status_; |
|
WebPWorkerHook 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' |
|
} WebPWorker; |
|
|
|
// Must be called first, before any other method. |
|
void WebPWorkerInit(WebPWorker* const worker); |
|
// Must be called initialize the object and spawn the thread. Re-entrant. |
|
// Will potentially launch the thread. Returns false in case of error. |
|
int WebPWorkerReset(WebPWorker* const worker); |
|
// Make sure the previous work is finished. Returns true if worker->had_error |
|
// was not set and not error condition was triggered by the working thread. |
|
int WebPWorkerSync(WebPWorker* const worker); |
|
// Trigger 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 WebPWorkerSync(). |
|
void WebPWorkerLaunch(WebPWorker* const worker); |
|
// Kill the thread and terminate the object. To use the object again, one |
|
// must call WebPWorkerReset() again. |
|
void WebPWorkerEnd(WebPWorker* const worker); |
|
|
|
//------------------------------------------------------------------------------ |
|
|
|
#if defined(__cplusplus) || defined(c_plusplus) |
|
} // extern "C" |
|
#endif |
|
|
|
#endif /* WEBP_UTILS_THREAD_H_ */
|
|
|