Multithreading

Multithreading. More...

Typedefs

typedef void(* gavl_video_process_func )(void *data, int start, int end)
 Prototype of a process function.
typedef void(* gavl_video_run_func )(gavl_video_process_func func, void *gavl_data, int start, int end, void *client_data, int thread)
 Run a piece of a calculation.
typedef void(* gavl_video_stop_func )(void *client_data, int thread)
 Wait until a piece of a calculation finished.

Detailed Description

Multithreading.

gavl has generic multithreading support for video processing. It's done by splitting the calculations in smaller pieces (usually slices of the destination images) and calling user supplied functions, which can transfer the tasks to worker threads. Multithreading is configured with gavl_video_options_set_num_threads, gavl_video_options_set_run_func and gavl_video_options_set_stop_func


Typedef Documentation

typedef void(* gavl_video_process_func)(void *data, int start, int end)

Prototype of a process function.

Parameters:
data Private data
Parameters:
start Where the function should start
Parameters:
end Where the function should end (exclusive)
This function is supplied by gavl and passed to the application, which then executes multiple instances of the functions in multiple threads
typedef void(* gavl_video_run_func)(gavl_video_process_func func, void *gavl_data, int start, int end, void *client_data, int thread)

Run a piece of a calculation.

Parameters:
func Function to execute
Parameters:
gavl_data 1. Argument for func
Parameters:
start 2. Argument for func
Parameters:
end 3. Argument for func
Parameters:
client_data Data passed with gavl_video_options_set_run_func
Parameters:
thread Number of processing thread (starting with 0)
This function supplied by the application and passed to gavl via gavl_video_options_set_run_func. It should call func with the given parameters in a worker thread.
typedef void(* gavl_video_stop_func)(void *client_data, int thread)

Wait until a piece of a calculation finished.

client_data Data passed with gavl_video_options_set_stop_func

Parameters:
thread Number of processing thread (starting with 0)
This function must make sure that the task started by gavl_video_run_func is finished.

Generated on Fri Dec 16 02:06:31 2011 for gavl by  doxygen 1.6.3