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#
# Nim's Runtime Library
# (c) Copyright 2018 Jörg Wollenschläger
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## Types and operations for atomic operations and lockless algorithms.
##
## Unstable API.
runnableExamples:
# Atomic
var loc: Atomic[int]
loc.store(4)
assert loc.load == 4
loc.store(2)
assert loc.load(moRelaxed) == 2
loc.store(9)
assert loc.load(moAcquire) == 9
loc.store(0, moRelease)
assert loc.load == 0
assert loc.exchange(7) == 0
assert loc.load == 7
var expected = 7
assert loc.compareExchange(expected, 5, moRelaxed, moRelaxed)
assert expected == 7
assert loc.load == 5
assert not loc.compareExchange(expected, 12, moRelaxed, moRelaxed)
assert expected == 5
assert loc.load == 5
assert loc.fetchAdd(1) == 5
assert loc.fetchAdd(2) == 6
assert loc.fetchSub(3) == 8
loc.atomicInc(1)
assert loc.load == 6
# AtomicFlag
var flag: AtomicFlag
assert not flag.testAndSet
assert flag.testAndSet
flag.clear(moRelaxed)
assert not flag.testAndSet
when (defined(cpp) and not defined(nimUseCAtomics)) or defined(nimdoc):
# For the C++ backend, types and operations map directly to C++11 atomics.
{.push, header: "<atomic>".}
type
MemoryOrder* {.importcpp: "std::memory_order".} = enum
## Specifies how non-atomic operations can be reordered around atomic
## operations.
moRelaxed
## No ordering constraints. Only the atomicity and ordering against
## other atomic operations is guaranteed.
moConsume
## This ordering is currently discouraged as it's semantics are
## being revised. Acquire operations should be preferred.
moAcquire
## When applied to a load operation, no reads or writes in the
## current thread can be reordered before this operation.
moRelease
## When applied to a store operation, no reads or writes in the
## current thread can be reorderd after this operation.
moAcquireRelease
## When applied to a read-modify-write operation, this behaves like
## both an acquire and a release operation.
moSequentiallyConsistent
## Behaves like Acquire when applied to load, like Release when
## applied to a store and like AcquireRelease when applied to a
## read-modify-write operation.
## Also guarantees that all threads observe the same total ordering
## with other moSequentiallyConsistent operations.
type
Atomic*[T] {.importcpp: "std::atomic", completeStruct.} = object
## An atomic object with underlying type `T`.
raw: T
AtomicFlag* {.importcpp: "std::atomic_flag", size: 1.} = object
## An atomic boolean state.
# Access operations
proc load*[T](location: var Atomic[T]; order: MemoryOrder = moSequentiallyConsistent): T {.importcpp: "#.load(@)".}
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