D Programming Language
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# std.experimental.allocator.mmap_allocator

struct MmapAllocator;
  Allocator (currently defined only for Posix) using mmap and munmap directly. There is no additional structure: each call to allocate(s) issues a call to mmap(null, s, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0), and each call to deallocate(b) issues munmap(b.ptr, b.length). So MmapAllocator is usually intended for allocating large chunks to be managed by fine-granular allocators.
  static MmapAllocator instance;
    The one shared instance.
  enum size_t alignment;
    Alignment is page-size and hardcoded to 4096 (even though on certain systems it could be larger).
  shared void[] allocate(size_t bytes);
  shared bool deallocate(void[] b);
    Allocator API.

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