blob: a65015d8618d74e7c45bea1cb91de956af5d0345 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/* Copyright (c) the JPEG XL Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
*/
/** @addtogroup libjxl_threads
* @{
* @file resizable_parallel_runner.h
* @brief implementation using std::thread of a resizeable ::JxlParallelRunner.
*/
/** Implementation of JxlParallelRunner than can be used to enable
* multithreading when using the JPEG XL library. This uses std::thread
* internally and related synchronization functions. The number of threads
* created can be changed after creation of the thread pool; the threads
* (including the main thread) are re-used for every
* ResizableParallelRunner::Runner call. Only one concurrent
* JxlResizableParallelRunner call per instance is allowed at a time.
*
* This is a scalable, lower-overhead thread pool runner, especially suitable
* for data-parallel computations in the fork-join model, where clients need to
* know when all tasks have completed.
*
* Compared to the implementation in @ref thread_parallel_runner.h, this
* implementation is tuned for execution on lower-powered systems, including
* for example ARM CPUs with big.LITTLE computation models.
*/
#ifndef JXL_RESIZABLE_PARALLEL_RUNNER_H_
#define JXL_RESIZABLE_PARALLEL_RUNNER_H_
#include <jxl/jxl_threads_export.h>
#include <jxl/memory_manager.h>
#include <jxl/parallel_runner.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
/** Parallel runner internally using std::thread. Use as JxlParallelRunner.
*/
JXL_THREADS_EXPORT JxlParallelRetCode JxlResizableParallelRunner(
void* runner_opaque, void* jpegxl_opaque, JxlParallelRunInit init,
JxlParallelRunFunction func, uint32_t start_range, uint32_t end_range);
/** Creates the runner for JxlResizableParallelRunner. Use as the opaque
* runner. The runner will execute tasks on the calling thread until
* @ref JxlResizableParallelRunnerSetThreads is called.
*/
JXL_THREADS_EXPORT void* JxlResizableParallelRunnerCreate(
const JxlMemoryManager* memory_manager);
/** Changes the number of threads for JxlResizableParallelRunner.
*/
JXL_THREADS_EXPORT void JxlResizableParallelRunnerSetThreads(
void* runner_opaque, size_t num_threads);
/** Suggests a number of threads to use for an image of given size.
*/
JXL_THREADS_EXPORT uint32_t
JxlResizableParallelRunnerSuggestThreads(uint64_t xsize, uint64_t ysize);
/** Destroys the runner created by JxlResizableParallelRunnerCreate.
*/
JXL_THREADS_EXPORT void JxlResizableParallelRunnerDestroy(void* runner_opaque);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
#endif /* JXL_RESIZABLE_PARALLEL_RUNNER_H_ */
/** @}*/
|
