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struct MmapAllocator;
Allocator (currently defined only for Posix and Windows) using mmap and munmap directly (or their Windows equivalents). 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 shared 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.