mem_arena.c File Reference

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

#include "memory/mem_arena.h"
#include "memory/mem_os.h"

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Functions
static void *	arena_push_internal (Arena *arena, usize size, usize alignment)
	Core allocation primitive with a caller-specified alignment.
Arena	arena_create (usize reserve_size)
	Creates and initializes a new arena, reserving virtual address space.
void	arena_release (Arena *arena)
	Releases the entire arena back to the OS, invalidating all pointers into it.
void *	arena_push (Arena *arena, usize size)
	Allocates size bytes from the arena, aligned to ARENA_DEFAULT_ALIGN.
void *	arena_push_zero (Arena *arena, usize size)
	Allocates size bytes from the arena, zeroed, aligned to ARENA_DEFAULT_ALIGN.
void *	arena_push_aligned (Arena *arena, usize size, usize alignment)
	Allocates size bytes from the arena with an explicit power-of-2 alignment.
void	arena_pop_to (Arena *arena, usize pos)
	Rolls the arena back to a specific byte offset.
void	arena_clear (Arena *arena)
	Resets the arena to empty by setting pos back to 0.
ArenaTemp	arena_temp_begin (Arena *arena)
	Saves the current arena position as a rewind checkpoint.
void	arena_temp_end (ArenaTemp temp)
	Restores the arena to the position saved in temp.

Detailed Description

Implementation of the Virtual Memory Linear (Arena) Allocator.

Copyright

2025 Alfred Jijo (MIT License)

Definition in file mem_arena.c.

Function Documentation

arena_push_internal()

void * arena_push_internal ( Arena * arena, usize size, usize alignment )

static

Core allocation primitive with a caller-specified alignment.

All public push functions funnel through here so the commit logic lives in exactly one place.

Parameters

arena	The arena to allocate from.
size	Number of bytes requested.
alignment	Must be a power of 2.

Returns

Aligned pointer to allocated memory, or NULL on OOM.

Definition at line 23 of file mem_arena.c.

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