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tatomics.nim
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import std/bitops, threading/atomics
# Atomic operations for trivial objects
block trivialLoad:
var location: Atomic[int]
location.store(1)
doAssert location.load == 1
location.store(2)
doAssert location.load(Relaxed) == 2
location.store(3)
doAssert location.load(Acquire) == 3
block trivialStore:
var location: Atomic[int]
location.store(1)
doAssert location.load == 1
location.store(2, Relaxed)
doAssert location.load == 2
location.store(3, Release)
doAssert location.load == 3
block trivialExchange:
var location: Atomic[int]
location.store(1)
doAssert location.exchange(2) == 1
doAssert location.exchange(3, Relaxed) == 2
doAssert location.exchange(4, Acquire) == 3
doAssert location.exchange(5, Release) == 4
doAssert location.exchange(6, AcqRel) == 5
doAssert location.load == 6
block trivialCompareExchangeDoesExchange:
var location: Atomic[int]
var expected = 1
location.store(1)
doAssert location.compareExchange(expected, 2)
doAssert expected == 1
doAssert location.load == 2
expected = 2
doAssert location.compareExchange(expected, 3, Relaxed)
doAssert expected == 2
doAssert location.load == 3
expected = 3
doAssert location.compareExchange(expected, 4, Acquire)
doAssert expected == 3
doAssert location.load == 4
expected = 4
doAssert location.compareExchange(expected, 5, Release)
doAssert expected == 4
doAssert location.load == 5
expected = 5
doAssert location.compareExchange(expected, 6, AcqRel)
doAssert expected == 5
doAssert location.load == 6
block trivialCompareExchangeDoesNotExchange:
var location: Atomic[int]
var expected = 10
location.store(1)
doAssert not location.compareExchange(expected, 2)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchange(expected, 3, Relaxed)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchange(expected, 4, Acquire)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchange(expected, 5, Release)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchange(expected, 6, AcqRel)
doAssert expected == 1
doAssert location.load == 1
block trivialCompareExchangeSuccessFailureDoesExchange:
var location: Atomic[int]
var expected = 1
location.store(1)
doAssert location.compareExchange(expected, 2, SeqCst, SeqCst)
doAssert expected == 1
doAssert location.load == 2
expected = 2
doAssert location.compareExchange(expected, 3, Relaxed, Relaxed)
doAssert expected == 2
doAssert location.load == 3
expected = 3
doAssert location.compareExchange(expected, 4, Acquire, Acquire)
doAssert expected == 3
doAssert location.load == 4
expected = 4
doAssert location.compareExchange(expected, 5, Release, Release)
doAssert expected == 4
doAssert location.load == 5
expected = 5
doAssert location.compareExchange(expected, 6, AcqRel, AcqRel)
doAssert expected == 5
doAssert location.load == 6
block trivialCompareExchangeSuccessFailureDoesNotExchange:
var location: Atomic[int]
var expected = 10
location.store(1)
doAssert not location.compareExchange(expected, 2, SeqCst, SeqCst)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchange(expected, 3, Relaxed, Relaxed)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchange(expected, 4, Acquire, Acquire)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchange(expected, 5, Release, Release)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchange(expected, 6, AcqRel, AcqRel)
doAssert expected == 1
doAssert location.load == 1
block trivialCompareExchangeWeakDoesExchange:
var location: Atomic[int]
var expected = 1
location.store(1)
doAssert location.compareExchangeWeak(expected, 2)
doAssert expected == 1
doAssert location.load == 2
expected = 2
doAssert location.compareExchangeWeak(expected, 3, Relaxed)
doAssert expected == 2
doAssert location.load == 3
expected = 3
doAssert location.compareExchangeWeak(expected, 4, Acquire)
doAssert expected == 3
doAssert location.load == 4
expected = 4
doAssert location.compareExchangeWeak(expected, 5, Release)
doAssert expected == 4
doAssert location.load == 5
expected = 5
doAssert location.compareExchangeWeak(expected, 6, AcqRel)
doAssert expected == 5
doAssert location.load == 6
block trivialCompareExchangeWeakDoesNotExchange:
var location: Atomic[int]
var expected = 10
location.store(1)
doAssert not location.compareExchangeWeak(expected, 2)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchangeWeak(expected, 3, Relaxed)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchangeWeak(expected, 4, Acquire)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchangeWeak(expected, 5, Release)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchangeWeak(expected, 6, AcqRel)
doAssert expected == 1
doAssert location.load == 1
block trivialCompareExchangeWeakSuccessFailureDoesExchange:
var location: Atomic[int]
var expected = 1
location.store(1)
doAssert location.compareExchangeWeak(expected, 2, SeqCst, SeqCst)
doAssert expected == 1
doAssert location.load == 2
expected = 2
doAssert location.compareExchangeWeak(expected, 3, Relaxed, Relaxed)
doAssert expected == 2
doAssert location.load == 3
expected = 3
doAssert location.compareExchangeWeak(expected, 4, Acquire, Acquire)
doAssert expected == 3
doAssert location.load == 4
expected = 4
doAssert location.compareExchangeWeak(expected, 5, Release, Release)
doAssert expected == 4
doAssert location.load == 5
expected = 5
doAssert location.compareExchangeWeak(expected, 6, AcqRel, AcqRel)
doAssert expected == 5
doAssert location.load == 6
block trivialCompareExchangeWeakSuccessFailureDoesNotExchange:
var location: Atomic[int]
var expected = 10
location.store(1)
doAssert not location.compareExchangeWeak(expected, 2, SeqCst, SeqCst)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchangeWeak(expected, 3, Relaxed, Relaxed)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchangeWeak(expected, 4, Acquire, Acquire)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchangeWeak(expected, 5, Release, Release)
doAssert expected == 1
doAssert location.load == 1
expected = 10
doAssert not location.compareExchangeWeak(expected, 6, AcqRel, AcqRel)
doAssert expected == 1
doAssert location.load == 1
# Numerical operations
block fetchAdd:
var location: Atomic[int]
doAssert location.fetchAdd(1) == 0
doAssert location.fetchAdd(1, Relaxed) == 1
doAssert location.fetchAdd(1, Release) == 2
doAssert location.load == 3
block fetchSub:
var location: Atomic[int]
doAssert location.fetchSub(1) == 0
doAssert location.fetchSub(1, Relaxed) == -1
doAssert location.fetchSub(1, Release) == -2
doAssert location.load == -3
block fetchAnd:
var location: Atomic[int]
for i in 0..16:
for j in 0..16:
location.store(i)
doAssert(location.fetchAnd(j) == i)
doAssert(location.load == i.bitand(j))
for i in 0..16:
for j in 0..16:
location.store(i)
doAssert(location.fetchAnd(j, Relaxed) == i)
doAssert(location.load == i.bitand(j))
for i in 0..16:
for j in 0..16:
location.store(i)
doAssert(location.fetchAnd(j, Release) == i)
doAssert(location.load == i.bitand(j))
block fetchOr:
var location: Atomic[int]
for i in 0..16:
for j in 0..16:
location.store(i)
doAssert(location.fetchOr(j) == i)
doAssert(location.load == i.bitor(j))
for i in 0..16:
for j in 0..16:
location.store(i)
doAssert(location.fetchOr(j, Relaxed) == i)
doAssert(location.load == i.bitor(j))
for i in 0..16:
for j in 0..16:
location.store(i)
doAssert(location.fetchOr(j, Release) == i)
doAssert(location.load == i.bitor(j))
block fetchXor:
var location: Atomic[int]
for i in 0..16:
for j in 0..16:
location.store(i)
doAssert(location.fetchXor(j) == i)
doAssert(location.load == i.bitxor(j))
for i in 0..16:
for j in 0..16:
location.store(i)
doAssert(location.fetchXor(j, Relaxed) == i)
doAssert(location.load == i.bitxor(j))
for i in 0..16:
for j in 0..16:
location.store(i)
doAssert(location.fetchXor(j, Release) == i)
doAssert(location.load == i.bitxor(j))
block atomicInc:
var location: Atomic[int]
location.atomicInc
doAssert location.load == 1
location.atomicInc(1)
doAssert location.load == 2
location += 1
doAssert location.load == 3
block atomicDec:
var location: Atomic[int]
location.atomicDec
doAssert location.load == -1
location.atomicDec(1)
doAssert location.load == -2
location -= 1
doAssert location.load == -3