---
title: mmmalloc
related:
  - "[thread_pool](thread_pool.md)"
categories:
  - C libraries
---

**mmmalloc** is a misoptimised memory allocator: my own `malloc`, `free`,
`calloc` and `realloc`. It is the new version of *hallocator*, my previous
allocator: memory now grows dynamically and `calloc` is implemented.

## Synopsis

```
void *malloc(size_t size);
void free(void *_Nullable ptr);
void *calloc(size_t nmemb, size_t size);
void *realloc(void *_Nullable ptr, size_t size);
```

They follow the usual C11 and POSIX semantics, with one difference: `size`
must be greater than 0 (the non-GNU approach). On error they return NULL and
set `errno` to `ENOMEM`; nothing makes the program exit.

> [!WARNING]
> The functions are not thread-safe: locking has to be handled externally.

If you notice strange behaviour you think comes from the allocator, open an
issue.

## See also

- [Source code](https://github.com/hugoocoto/mmmalloc)