mem_arena.c File Reference

Implementation of the Virtual Memory Linear (Arena) Allocator. More...

#include "memory/mem_arena.h"
#include "memory/mem_allocator.h"
#include "memory/mem_os.h"
#include <string.h>

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Macros
#define	MEM_ARENA_COMMIT_SIZE   KB(64)

Functions
static void *	mem_arena_push_internal (MemArena *arena, usize size, usize alignment)
MemArena	mem_arena_create (usize reserve_size)
	Initializes a new virtual memory Arena.
void	mem_arena_release (MemArena *arena)
	Returns all virtual memory back to the operating system.
void *	mem_arena_push (MemArena *arena, usize size)
	Allocates bytes sequentially on the arena without zeroing.
void *	mem_arena_push_zero (MemArena *arena, usize size)
	Allocates bytes and explicitly zero-initializes them.
void *	mem_arena_push_aligned (MemArena *arena, usize size, usize alignment)
	Allocates bytes with a specific custom alignment.
void	mem_arena_pop_to (MemArena *arena, usize pos)
	Rewinds the arena's pointer to a specific offset.
void	mem_arena_clear (MemArena *arena)
	Resets the arena pointer to zero, freeing all allocations in O(1).
void	mem_arena_clear_and_decommit (MemArena *arena)
	Clears the arena and returns all committed physical RAM to the OS.
char *	mem_arena_push_cstr (MemArena *arena, const char *str, usize len)
	Copies a C string into the arena and appends a NUL terminator.
MemArenaTemp	mem_arena_temp_begin (MemArena *arena)
	Temporary Memory API.
void	mem_arena_temp_end (MemArenaTemp temp)
	Restores the arena to the position saved in temp.
static void *	mem_arena_alloc_impl (MemAllocMode mode, void *ctx, usize size, void *old_ptr)
	Generic Allocator Interface Implementation.
MemAllocator	mem_arena_allocator (MemArena *arena)
	Wraps a MemArena in the generic MemAllocator interface.

Detailed Description

Implementation of the Virtual Memory Linear (Arena) Allocator.

Copyright

2026 Alfred Jijo (MIT License)

Definition in file mem_arena.c.

Macro Definition Documentation

MEM_ARENA_COMMIT_SIZE

#define MEM_ARENA_COMMIT_SIZE   KB(64)

Definition at line 13 of file mem_arena.c.

Function Documentation

mem_arena_alloc_impl()

void * mem_arena_alloc_impl ( MemAllocMode mode, void * ctx, usize size, void * old_ptr )

static

Generic Allocator Interface Implementation.

Definition at line 149 of file mem_arena.c.

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mem_arena_push_internal()

void * mem_arena_push_internal ( MemArena * arena, usize size, usize alignment )

static

Definition at line 16 of file mem_arena.c.