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Struct std.experimental.allocator.ThreadLocal
Stores an allocator object in thread-local storage (i.e. non-shared
D
global). ThreadLocal!A
is a subtype of A
so it appears to implement
A
's allocator primitives.
struct ThreadLocal(A)
;
A
must hold state, otherwise ThreadLocal!A
refuses instantiation. This
means e.g. ThreadLocal!Mallocator
does not work because Mallocator
's
state is not stored as members of Mallocator
, but instead is hidden in the
C library implementation.
Constructors
Name | Description |
---|---|
this
()
|
ThreadLocal disables all constructors. The intended usage is
ThreadLocal!A .
|
Fields
Name | Type | Description |
---|---|---|
instance
|
A | The allocator instance. |
Example
import std .experimental .allocator .building_blocks .free_list : FreeList;
import std .experimental .allocator .gc_allocator : GCAllocator;
import std .experimental .allocator .mallocator : Mallocator;
static assert(!is(ThreadLocal!Mallocator));
static assert(!is(ThreadLocal!GCAllocator));
alias Allocator = ThreadLocal!(FreeList!(GCAllocator, 0, 8));
auto b = Allocator .instance .allocate(5);
static assert(__traits(hasMember, Allocator, "allocate"));
Example
import std .experimental .allocator .building_blocks .allocator_list : AllocatorList;
import std .experimental .allocator .building_blocks .bitmapped_block : BitmappedBlock;
import std .experimental .allocator .building_blocks .segregator : Segregator;
import std .experimental .allocator .building_blocks .bucketizer : Bucketizer;
import std .experimental .allocator .building_blocks .free_list : FreeList;
import std .experimental .allocator .gc_allocator : GCAllocator;
/// Define an allocator bound to the built-in GC.
auto alloc = allocatorObject(GCAllocator .instance);
auto b = alloc .allocate(42);
writeln(b .length); // 42
assert(alloc .deallocate(b));
import std .algorithm .comparison : max;
// Define an elaborate allocator and bind it to the class API.
alias FList = FreeList!(GCAllocator, 0, unbounded);
alias A = ThreadLocal!(
Segregator!(
8, FreeList!(GCAllocator, 0, 8),
128, Bucketizer!(FList, 1, 128, 16),
256, Bucketizer!(FList, 129, 256, 32),
512, Bucketizer!(FList, 257, 512, 64),
1024, Bucketizer!(FList, 513, 1024, 128),
2048, Bucketizer!(FList, 1025, 2048, 256),
3584, Bucketizer!(FList, 2049, 3584, 512),
4072 * 1024, AllocatorList!(
(n) => BitmappedBlock!(4096)(cast(ubyte[]) GCAllocator .instance .allocate(
max(n, 4072 * 1024)))),
GCAllocator
)
);
auto alloc2 = allocatorObject(A .instance);
b = alloc2 .allocate(101);
assert(alloc2 .deallocate(b));
Authors
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.