44 lines
1 KiB
C
44 lines
1 KiB
C
// SPDX-License-Identifier: BSD-3-Clause
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#ifndef ARENA_H
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#define ARENA_H
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#include "../types.h"
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/*
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* An arena is a fast allocator that just
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* keeps everything in a contiguous chunk
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* of memory and moves a "pointer" when
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* allocating new memory. The allocated
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* memory is then free'd all at once.
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*/
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struct arena_allocator {
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usize size;
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usize base;
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usize position;
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};
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extern struct arena_allocator *global_arena;
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/* Create a new arena allocator of size `size` */
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struct arena_allocator *arena_init(usize size);
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/* Destroy the allocator and */
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void arena_deinit(struct arena_allocator *allocator);
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/*
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* Allocate a chunk of memory of size `size` on the
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* arena.
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*/
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void *arena_alloc(struct arena_allocator *allocator, usize size);
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/*
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* Same as `arena_alloc()` but also set all the allocated
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* memory to zero.
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*/
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void *arena_zalloc(struct arena_allocator *allocator, usize size);
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/*
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* Free all the allocated memory at once.
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* This just sets the allocator cursor to its
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* starting position.
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*/
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void arena_bump(struct arena_allocator *allocator);
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#endif
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