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atomic loads do not require a mutable location [backport]

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Araq
2024-06-27 20:46:49 +02:00
parent 828cd58d8a
commit f1ccfb1b00
1 changed files with 4 additions and 4 deletions
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8
lib/pure/concurrency/atomics.nim
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@@ -98,7 +98,7 @@ when defined(cpp) or defined(nimdoc):
# Access operations
proc load*[T](location: var Atomic[T]; order: MemoryOrder = moSequentiallyConsistent): T {.importcpp: "#.load(@)".}
proc load*[T](location: Atomic[T]; order: MemoryOrder = moSequentiallyConsistent): T {.importcpp: "#.load(@)".}
## Atomically obtains the value of the atomic object.
proc store*[T](location: var Atomic[T]; desired: T; order: MemoryOrder = moSequentiallyConsistent) {.importcpp: "#.store(@)".}
@@ -245,7 +245,7 @@ else:
proc clear*(location: var AtomicFlag; order: MemoryOrder = moSequentiallyConsistent) =
discard interlockedAnd(addr(location), 0'i8)
proc load*[T: Trivial](location: var Atomic[T]; order: MemoryOrder = moSequentiallyConsistent): T {.inline.} =
proc load*[T: Trivial](location: Atomic[T]; order: MemoryOrder = moSequentiallyConsistent): T {.inline.} =
cast[T](interlockedOr(addr(location.value), (nonAtomicType(T))0))
proc store*[T: Trivial](location: var Atomic[T]; desired: T; order: MemoryOrder = moSequentiallyConsistent) {.inline.} =
discard interlockedExchange(addr(location.value), cast[nonAtomicType(T)](desired))
@@ -332,7 +332,7 @@ else:
{.pop.}
proc load*[T: Trivial](location: var Atomic[T]; order: MemoryOrder = moSequentiallyConsistent): T {.inline.} =
proc load*[T: Trivial](location: Atomic[T]; order: MemoryOrder = moSequentiallyConsistent): T {.inline.} =
cast[T](atomic_load_explicit[nonAtomicType(T), typeof(location.value)](addr(location.value), order))
proc store*[T: Trivial](location: var Atomic[T]; desired: T; order: MemoryOrder = moSequentiallyConsistent) {.inline.} =
atomic_store_explicit(addr(location.value), cast[nonAtomicType(T)](desired), order)
@@ -367,7 +367,7 @@ else:
finally:
clear(location.guard, moRelease)
proc load*[T: not Trivial](location: var Atomic[T]; order: MemoryOrder = moSequentiallyConsistent): T {.inline.} =
proc load*[T: not Trivial](location: Atomic[T]; order: MemoryOrder = moSequentiallyConsistent): T {.inline.} =
withLock(location, order):
result = location.nonAtomicValue