TLSF Memory Storage allocator implementation.
Version 2.4 Feb 2008

New functionality added:

• Growing the memory pool

  Starting from the version 2.4, the function add_new_area adds an
  memory area to an existing memory pool.

  - size_t add_new_area(void *, size_t, void *);

  This feature is pretty useful when an existing memory pool is running
  low and we want to add more free memory to it.

  EXAMPLE OF USE:

  char memory_pool[1024*1024];
  char memory_pool2[1024*1024];

  {
  ...

  init_memory_pool(1024*1024, memory_pool);

  ...

  ptr[0]=malloc_ex(1024*256 memory_pool);
  ptr[1]=malloc_ex(1024*512, memory_pool);
  add_new_area(memory_pool2, 1024*1024, memory_pool);
  // Now we have an extra free memory area of 1Mb
  // The next malloc may not fail
  ptr[2]=malloc_ex(1024*512, memory_pool);

  ...

  }

• SBRK and MMAP support

  The version 2.4 can use the functions SBRK and MMAP to _automatically_
  growing the memory pool, before running out of memory.

  So, when this feature is enabled, unless the operating system were out
  of memory, a malloc operation would not fail due to an "out-of-memory"
  error.

  To enable this support, compile tlsf.c with the FLAGS -DUSE_MMAP=1 or
  -DUSE_SBRK=1 depending on whether you want to use "mmap" or "sbrk" or both.

  ** By default (default Makefile) this feature is enabled.

  EXAMPLE OF USE:

  gcc -o tlsf.o -O2 -Wall -DUSE_MMAP=1 -DUSE_SBRK=1

  ---

  If the sbrk/mmap support is enabled and we are _only_ going to use one
  memory pool, it is not necessary to call init_memory_pool

  EXAMPLE OF USE (with MMAP/SBRK support enabled):

  {
  ...

  ptr2=tlsf_malloc(100); // This function will use memory_pool

  ...

  tlsf_free(ptr2);
  }