MmapAllocator

Allocator (currently defined only for Posix and Windows) using $(LINK2 https://en.wikipedia.org/wiki/Mmap, mmap) and $(LUCKY 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.

struct MmapAllocator {

static shared const

MmapAllocator instance;

enum size_t alignment;

void[] allocate(size_t bytes);

bool deallocate(void[] b);

version(!Posix)
version(Windows)

void[] allocate(size_t bytes);

version(!Posix)
version(Windows)

bool deallocate(void[] b);

}

Members

Functions

allocate void[] allocate(size_t bytes): Allocator API.
allocate void[] allocate(size_t bytes)
deallocate bool deallocate(void[] b): Allocator API.

Static variables

instance MmapAllocator instance;: The one shared instance.

Variables

alignment enum size_t alignment;: Alignment is page-size and hardcoded to 4096 (even though on certain systems it could be larger).

Meta

Source

See Implementation

std experimental allocator mmap_allocator structs

MmapAllocator