mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-21 03:16:54 +01:00
368 lines
11 KiB
C++
368 lines
11 KiB
C++
/**************************************************************************/
|
|
/* paged_array.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 PAGED_ARRAY_H
|
|
#define PAGED_ARRAY_H
|
|
|
|
#include "core/os/memory.h"
|
|
#include "core/os/spin_lock.h"
|
|
#include "core/typedefs.h"
|
|
|
|
// PagedArray is used mainly for filling a very large array from multiple threads efficiently and without causing major fragmentation
|
|
|
|
// PageArrayPool manages central page allocation in a thread safe matter
|
|
|
|
template <class T>
|
|
class PagedArrayPool {
|
|
T **page_pool = nullptr;
|
|
uint32_t pages_allocated = 0;
|
|
|
|
uint32_t *available_page_pool = nullptr;
|
|
uint32_t pages_available = 0;
|
|
|
|
uint32_t page_size = 0;
|
|
SpinLock spin_lock;
|
|
|
|
public:
|
|
uint32_t alloc_page() {
|
|
spin_lock.lock();
|
|
if (unlikely(pages_available == 0)) {
|
|
uint32_t pages_used = pages_allocated;
|
|
|
|
pages_allocated++;
|
|
page_pool = (T **)memrealloc(page_pool, sizeof(T *) * pages_allocated);
|
|
available_page_pool = (uint32_t *)memrealloc(available_page_pool, sizeof(uint32_t) * pages_allocated);
|
|
|
|
page_pool[pages_used] = (T *)memalloc(sizeof(T) * page_size);
|
|
available_page_pool[0] = pages_used;
|
|
|
|
pages_available++;
|
|
}
|
|
|
|
pages_available--;
|
|
uint32_t page = available_page_pool[pages_available];
|
|
spin_lock.unlock();
|
|
|
|
return page;
|
|
}
|
|
T *get_page(uint32_t p_page_id) {
|
|
return page_pool[p_page_id];
|
|
}
|
|
|
|
void free_page(uint32_t p_page_id) {
|
|
spin_lock.lock();
|
|
available_page_pool[pages_available] = p_page_id;
|
|
pages_available++;
|
|
spin_lock.unlock();
|
|
}
|
|
|
|
uint32_t get_page_size_shift() const {
|
|
return get_shift_from_power_of_2(page_size);
|
|
}
|
|
|
|
uint32_t get_page_size_mask() const {
|
|
return page_size - 1;
|
|
}
|
|
|
|
void reset() {
|
|
ERR_FAIL_COND(pages_available < pages_allocated);
|
|
if (pages_allocated) {
|
|
for (uint32_t i = 0; i < pages_allocated; i++) {
|
|
memfree(page_pool[i]);
|
|
}
|
|
memfree(page_pool);
|
|
memfree(available_page_pool);
|
|
page_pool = nullptr;
|
|
available_page_pool = nullptr;
|
|
pages_allocated = 0;
|
|
pages_available = 0;
|
|
}
|
|
}
|
|
bool is_configured() const {
|
|
return page_size > 0;
|
|
}
|
|
|
|
void configure(uint32_t p_page_size) {
|
|
ERR_FAIL_COND(page_pool != nullptr); //sanity check
|
|
ERR_FAIL_COND(p_page_size == 0);
|
|
page_size = nearest_power_of_2_templated(p_page_size);
|
|
}
|
|
|
|
PagedArrayPool(uint32_t p_page_size = 4096) { // power of 2 recommended because of alignment with OS page sizes. Even if element is bigger, its still a multiple and get rounded amount of pages
|
|
configure(p_page_size);
|
|
}
|
|
|
|
~PagedArrayPool() {
|
|
ERR_FAIL_COND_MSG(pages_available < pages_allocated, "Pages in use exist at exit in PagedArrayPool");
|
|
reset();
|
|
}
|
|
};
|
|
|
|
// PageArray is a local array that is optimized to grow in place, then be cleared often.
|
|
// It does so by allocating pages from a PagedArrayPool.
|
|
// It is safe to use multiple PagedArrays from different threads, sharing a single PagedArrayPool
|
|
|
|
template <class T>
|
|
class PagedArray {
|
|
PagedArrayPool<T> *page_pool = nullptr;
|
|
|
|
T **page_data = nullptr;
|
|
uint32_t *page_ids = nullptr;
|
|
uint32_t max_pages_used = 0;
|
|
uint32_t page_size_shift = 0;
|
|
uint32_t page_size_mask = 0;
|
|
uint64_t count = 0;
|
|
|
|
_FORCE_INLINE_ uint32_t _get_pages_in_use() const {
|
|
if (count == 0) {
|
|
return 0;
|
|
} else {
|
|
return ((count - 1) >> page_size_shift) + 1;
|
|
}
|
|
}
|
|
|
|
void _grow_page_array() {
|
|
//no more room in the page array to put the new page, make room
|
|
if (max_pages_used == 0) {
|
|
max_pages_used = 1;
|
|
} else {
|
|
max_pages_used *= 2; // increase in powers of 2 to keep allocations to minimum
|
|
}
|
|
page_data = (T **)memrealloc(page_data, sizeof(T *) * max_pages_used);
|
|
page_ids = (uint32_t *)memrealloc(page_ids, sizeof(uint32_t) * max_pages_used);
|
|
}
|
|
|
|
public:
|
|
_FORCE_INLINE_ const T &operator[](uint64_t p_index) const {
|
|
CRASH_BAD_UNSIGNED_INDEX(p_index, count);
|
|
uint32_t page = p_index >> page_size_shift;
|
|
uint32_t offset = p_index & page_size_mask;
|
|
|
|
return page_data[page][offset];
|
|
}
|
|
_FORCE_INLINE_ T &operator[](uint64_t p_index) {
|
|
CRASH_BAD_UNSIGNED_INDEX(p_index, count);
|
|
uint32_t page = p_index >> page_size_shift;
|
|
uint32_t offset = p_index & page_size_mask;
|
|
|
|
return page_data[page][offset];
|
|
}
|
|
|
|
_FORCE_INLINE_ void push_back(const T &p_value) {
|
|
uint32_t remainder = count & page_size_mask;
|
|
if (unlikely(remainder == 0)) {
|
|
// at 0, so time to request a new page
|
|
uint32_t page_count = _get_pages_in_use();
|
|
uint32_t new_page_count = page_count + 1;
|
|
|
|
if (unlikely(new_page_count > max_pages_used)) {
|
|
ERR_FAIL_COND(page_pool == nullptr); //sanity check
|
|
|
|
_grow_page_array(); //keep out of inline
|
|
}
|
|
|
|
uint32_t page_id = page_pool->alloc_page();
|
|
page_data[page_count] = page_pool->get_page(page_id);
|
|
page_ids[page_count] = page_id;
|
|
}
|
|
|
|
// place the new value
|
|
uint32_t page = count >> page_size_shift;
|
|
uint32_t offset = count & page_size_mask;
|
|
|
|
if (!__has_trivial_constructor(T)) {
|
|
memnew_placement(&page_data[page][offset], T(p_value));
|
|
} else {
|
|
page_data[page][offset] = p_value;
|
|
}
|
|
|
|
count++;
|
|
}
|
|
|
|
_FORCE_INLINE_ void pop_back() {
|
|
ERR_FAIL_COND(count == 0);
|
|
|
|
if (!__has_trivial_destructor(T)) {
|
|
uint32_t page = (count - 1) >> page_size_shift;
|
|
uint32_t offset = (count - 1) & page_size_mask;
|
|
page_data[page][offset].~T();
|
|
}
|
|
|
|
uint32_t remainder = count & page_size_mask;
|
|
if (unlikely(remainder == 1)) {
|
|
// one element remained, so page must be freed.
|
|
uint32_t last_page = _get_pages_in_use() - 1;
|
|
page_pool->free_page(page_ids[last_page]);
|
|
}
|
|
count--;
|
|
}
|
|
|
|
void clear() {
|
|
//destruct if needed
|
|
if (!__has_trivial_destructor(T)) {
|
|
for (uint64_t i = 0; i < count; i++) {
|
|
uint32_t page = i >> page_size_shift;
|
|
uint32_t offset = i & page_size_mask;
|
|
page_data[page][offset].~T();
|
|
}
|
|
}
|
|
|
|
//return the pages to the pagepool, so they can be used by another array eventually
|
|
uint32_t pages_used = _get_pages_in_use();
|
|
for (uint32_t i = 0; i < pages_used; i++) {
|
|
page_pool->free_page(page_ids[i]);
|
|
}
|
|
|
|
count = 0;
|
|
|
|
//note we leave page_data and page_indices intact for next use. If you really want to clear them call reset()
|
|
}
|
|
|
|
void reset() {
|
|
clear();
|
|
if (page_data) {
|
|
memfree(page_data);
|
|
memfree(page_ids);
|
|
page_data = nullptr;
|
|
page_ids = nullptr;
|
|
max_pages_used = 0;
|
|
}
|
|
}
|
|
|
|
// This takes the pages from a source array and merges them to this one
|
|
// resulting order is undefined, but content is merged very efficiently,
|
|
// making it ideal to fill content on several threads to later join it.
|
|
|
|
void merge_unordered(PagedArray<T> &p_array) {
|
|
ERR_FAIL_COND(page_pool != p_array.page_pool);
|
|
|
|
uint32_t remainder = count & page_size_mask;
|
|
|
|
T *remainder_page = nullptr;
|
|
uint32_t remainder_page_id = 0;
|
|
|
|
if (remainder > 0) {
|
|
uint32_t last_page = _get_pages_in_use() - 1;
|
|
remainder_page = page_data[last_page];
|
|
remainder_page_id = page_ids[last_page];
|
|
}
|
|
|
|
count -= remainder;
|
|
|
|
uint32_t src_pages = p_array._get_pages_in_use();
|
|
uint32_t page_size = page_size_mask + 1;
|
|
|
|
for (uint32_t i = 0; i < src_pages; i++) {
|
|
uint32_t page_count = _get_pages_in_use();
|
|
uint32_t new_page_count = page_count + 1;
|
|
|
|
if (unlikely(new_page_count > max_pages_used)) {
|
|
_grow_page_array(); //keep out of inline
|
|
}
|
|
|
|
page_data[page_count] = p_array.page_data[i];
|
|
page_ids[page_count] = p_array.page_ids[i];
|
|
if (i == src_pages - 1) {
|
|
//last page, only increment with remainder
|
|
count += p_array.count & page_size_mask;
|
|
} else {
|
|
count += page_size;
|
|
}
|
|
}
|
|
p_array.count = 0; //take away the other array pages
|
|
|
|
//handle the remainder page if exists
|
|
if (remainder_page) {
|
|
uint32_t new_remainder = count & page_size_mask;
|
|
|
|
if (new_remainder > 0) {
|
|
//must merge old remainder with new remainder
|
|
|
|
T *dst_page = page_data[_get_pages_in_use() - 1];
|
|
uint32_t to_copy = MIN(page_size - new_remainder, remainder);
|
|
|
|
for (uint32_t i = 0; i < to_copy; i++) {
|
|
if (!__has_trivial_constructor(T)) {
|
|
memnew_placement(&dst_page[i + new_remainder], T(remainder_page[i + remainder - to_copy]));
|
|
} else {
|
|
dst_page[i + new_remainder] = remainder_page[i + remainder - to_copy];
|
|
}
|
|
|
|
if (!__has_trivial_destructor(T)) {
|
|
remainder_page[i + remainder - to_copy].~T();
|
|
}
|
|
}
|
|
|
|
remainder -= to_copy; //subtract what was copied from remainder
|
|
count += to_copy; //add what was copied to the count
|
|
|
|
if (remainder == 0) {
|
|
//entire remainder copied, let go of remainder page
|
|
page_pool->free_page(remainder_page_id);
|
|
remainder_page = nullptr;
|
|
}
|
|
}
|
|
|
|
if (remainder > 0) {
|
|
//there is still remainder, append it
|
|
uint32_t page_count = _get_pages_in_use();
|
|
uint32_t new_page_count = page_count + 1;
|
|
|
|
if (unlikely(new_page_count > max_pages_used)) {
|
|
_grow_page_array(); //keep out of inline
|
|
}
|
|
|
|
page_data[page_count] = remainder_page;
|
|
page_ids[page_count] = remainder_page_id;
|
|
|
|
count += remainder;
|
|
}
|
|
}
|
|
}
|
|
|
|
_FORCE_INLINE_ uint64_t size() const {
|
|
return count;
|
|
}
|
|
|
|
void set_page_pool(PagedArrayPool<T> *p_page_pool) {
|
|
ERR_FAIL_COND(max_pages_used > 0); //sanity check
|
|
|
|
page_pool = p_page_pool;
|
|
page_size_mask = page_pool->get_page_size_mask();
|
|
page_size_shift = page_pool->get_page_size_shift();
|
|
}
|
|
|
|
~PagedArray() {
|
|
reset();
|
|
}
|
|
};
|
|
|
|
#endif // PAGED_ARRAY_H
|