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

) {

import core.sys.posix.pthread : pthread_mutex_init, pthread_mutex_destroy, pthread_mutex_t, pthread_mutex_lock, pthread_mutex_unlock, PTHREAD_MUTEX_INITIALIZER;;

import stdx.allocator.internal : Ternary;;

enum SbrkRegion instance;

enum uint alignment;

static void[] allocate(size_t bytes);

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

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

static Ternary owns(void[] b);

static bool deallocate(void[] b);

static bool deallocateAll();

Ternary empty();

}

Members

Functions

empty Ternary empty(): Standard allocator API.

Static functions

alignedAllocate void[] alignedAllocate(size_t bytes, uint a)
allocate void[] allocate(size_t bytes): Standard allocator primitives.
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.
expand bool expand(void[] b, size_t delta)
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.

Variables

alignment enum uint alignment;: Standard allocator primitives.
instance enum SbrkRegion instance;: Instance shared by all callers.

SbrkRegion

Members

Functions

Static functions

Variables

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