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UNIcodeX/parallelProcessingGlobalVarWithExplicitPointerThreadanalysisOn.nim

Last active April 13, 2020 16:48
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This example of the parallel manipulation of a global var works without `--threadanalysis:off`
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parallelProcessingGlobalVarWithExplicitPointerThreadanalysisOn.nim
import locks, threadpool, strutils
# compile with:
# nim c -r --threads:on -d:danger --gc:arc
{.experimental: "parallel".}
var
lock: Lock
a: array[20, string]
initLock lock
# Can do this explicitly with:
# proc process(b: ptr array[20, string], s: string) =
# or lazily with:
proc process(b: ptr, s: string) =
withLock lock:
b[][parseInt(s)] = s
when isMainModule:
# could either explicitly define the pointer type
# var ptra: ptr array[20, string] = addr(a)
# or lazily with:
var ptra = addr(a)
parallel:
for i in 0 ..< a.len:
spawn process(ptra, $i)
sync()
echo a
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