117 lines
4.3 KiB
C++
117 lines
4.3 KiB
C++
/*************************************************************************/
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/* threaded_array_processor.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef THREADED_ARRAY_PROCESSOR_H
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#define THREADED_ARRAY_PROCESSOR_H
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#include "core/os/mutex.h"
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#include "core/os/os.h"
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#include "core/os/thread.h"
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#include "core/os/thread_safe.h"
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#include "core/safe_refcount.h"
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template <class C, class U>
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struct ThreadArrayProcessData {
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uint32_t elements;
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SafeNumeric<uint32_t> index;
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C *instance;
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U userdata;
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void (C::*method)(uint32_t, U);
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void process(uint32_t p_index) {
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(instance->*method)(p_index, userdata);
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}
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};
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#ifndef NO_THREADS
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template <class T>
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void process_array_thread(void *ud) {
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T &data = *(T *)ud;
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while (true) {
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uint32_t index = data.index.increment();
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if (index >= data.elements) {
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break;
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}
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data.process(index);
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}
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}
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// p_num_threads is the number of logical CPU cores to use (0 = use all logical CPU cores available).
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// Negative values subtract from the total number of logical CPU cores available.
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template <class C, class M, class U>
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void thread_process_array(uint32_t p_elements, C *p_instance, M p_method, U p_userdata, int p_num_threads = 0) {
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ThreadArrayProcessData<C, U> data;
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data.method = p_method;
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data.instance = p_instance;
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data.userdata = p_userdata;
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data.index.set(0);
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data.elements = p_elements;
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data.process(0); //process first, let threads increment for next
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int thread_count;
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if (p_num_threads <= 0) {
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thread_count = MAX(1, OS::get_singleton()->get_processor_count() + p_num_threads);
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} else {
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thread_count = p_num_threads;
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}
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Thread *threads = memnew_arr(Thread, thread_count);
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for (int i = 0; i < thread_count; i++) {
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threads[i].start(process_array_thread<ThreadArrayProcessData<C, U>>, &data);
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}
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for (int i = 0; i < thread_count; i++) {
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threads[i].wait_to_finish();
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}
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memdelete_arr(threads);
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}
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#else
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// p_num_threads is intentionally unused when threads are disabled.
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template <class C, class M, class U>
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void thread_process_array(uint32_t p_elements, C *p_instance, M p_method, U p_userdata, int p_num_threads = 0) {
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ThreadArrayProcessData<C, U> data;
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data.method = p_method;
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data.instance = p_instance;
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data.userdata = p_userdata;
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data.index.set(0);
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data.elements = p_elements;
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for (uint32_t i = 0; i < p_elements; i++) {
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data.process(i);
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}
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}
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#endif
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#endif // THREADED_ARRAY_PROCESSOR_H
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