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