SbrkRegion

Allocator backed by $(LINK2 https://en.wikipedia.org/wiki/Sbrk, sbrk) for Posix systems. Due to the fact that sbrk is not thread-safe by design, SbrkRegion uses a mutex internally. This implies that uncontrolled calls to brk and sbrk may affect the workings of SbrkRegion adversely.

version(Posix)

struct SbrkRegion (

uint minAlign = platformAlignment

) {

static shared

SbrkRegion instance;

enum uint alignment;

size_t goodAllocSize(size_t n);

void[] allocate(size_t bytes);

void[] alignedAllocate(size_t bytes, uint a);

bool expand(void[] b, size_t delta);

Ternary owns(void[] b);

bool deallocate(void[] b);

bool deallocateAll();

Ternary empty();

}

Members

Functions

alignedAllocate void[] alignedAllocate(size_t bytes, uint a)
allocate void[] allocate(size_t bytes): Rounds the given size to a multiple of thew alignment
deallocate bool deallocate(void[] b): The deallocate method only works (and returns true) on systems that support reducing the break address (i.e. accept calls to sbrk with negative offsets). OSX does not accept such. In addition the argument must be the last block allocated.
deallocateAll bool deallocateAll(): The deallocateAll method only works (and returns true) on systems that support reducing the break address (i.e. accept calls to sbrk with negative offsets). OSX does not accept such.
empty Ternary empty(): Standard allocator API.
expand bool expand(void[] b, size_t delta): The expand method may only succeed if the argument is the last block allocated. In that case, expand attempts to push the break pointer to the right.
goodAllocSize size_t goodAllocSize(size_t n): Rounds the given size to a multiple of thew alignment
owns Ternary owns(void[] b): The expand method may only succeed if the argument is the last block allocated. In that case, expand attempts to push the break pointer to the right.

Static variables

instance SbrkRegion instance;: Instance shared by all callers.

Variables

alignment enum uint alignment;: Standard allocator primitives.

SbrkRegion

Members

Functions

Static variables

Variables

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