Two-Level Segregated Fit memory allocator implementation derived from the BSD-licensed implementation by Matthew Conte. This code was based on the TLSF 1.4 spec and documentation found at https://www.gii.upv.es/tlsf/main/docs.

• O(1) cost for malloc, free, realloc, aligned_alloc
• Low overhead per allocation (one word)
• Low overhead for the TLSF metadata (~4kB)
• Low fragmentation
• Very small - only ~500 lines of code
• Compiles to only a few kB of code and data
• Uses a linear memory area, which is resized on demand
• Not thread safe. API calls must be protected by a mutex in a multi-threaded environment.
• Works in environments with only minimal libc, uses only stddef.h, stdbool.h, stdint.h and string.h.