63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
// API in Arena.h
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#include "Arena.h"
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#include "Array.h"
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#include "General_Purpose_Allocator.h"
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#include <mutex>
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global std::mutex arena_table_mutex;
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global s32 arenas_in_flight_count[6];
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global Array<Arena*> arena_free_table[6];
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#if BUILD_DEBUG
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global Array<Arena*> arenas_in_flight[6];
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#endif
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void initialize_arena_table () {
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for (s32 i = 0; i < 6; i += 1) {
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arena_free_table[i].allocator = GPAllocator();
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arenas_in_flight[i].allocator = GPAllocator();
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array_reserve(arena_free_table[i], 64);
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array_reserve(arenas_in_flight[i], 64);
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}
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}
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Arena* next_arena (Arena_Reserve reserve_size) {
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Arena* arena;
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std::lock_guard<std::mutex> lock(arena_table_mutex);
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s64 reserve_index = (s64)reserve_size;
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arenas_in_flight_count[reserve_index] += 1;
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if (!arena_free_table[reserve_index].count) {
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arena = bootstrap_arena(reserve_size, ARENA_DEFAULT_COMMIT_PAGE_COUNT);
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} else {
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arena = pop(arena_free_table[reserve_index]);
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}
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#if ARENA_DEBUG
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array_add(arenas_in_flight[reserve_index], arena);
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#endif
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Assert(arena != nullptr);
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return arena;
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}
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void release_arena (Arena* arena, bool delete_extra_pages) {
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std::lock_guard<std::mutex> lock(arena_table_mutex);
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s64 reserve_index = (s64)arena->reserve_size;
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#if ARENA_DEBUG
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array_unordered_remove_by_value(arenas_in_flight[reserve_index], arena, 1);
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#endif
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arena_reset_keeping_memory(arena);
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if (delete_extra_pages) {
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free_pages_down_to(arena, arena->initial_commit_page_count);
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}
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array_add(arena_free_table[reserve_index], arena);
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arenas_in_flight_count[reserve_index] -= 1;
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// #TODO: Garbage collection if we have >> 64 in a particular table for a while.
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//
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if (arena_free_table[reserve_index].count > 64) {
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// release some arenas if required
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// arena_delete(...)
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}
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}
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