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UNIcodeX/parallelProcessingNoPointerThreadanalysisOn.nim

Created April 15, 2020 04:13
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Example of parallel processing changing the value of a global variable without using a pointer. Instead it uses a `var` parameter, which automatically creates a pointer, as I understand it from Dom's book, Nim In Action.
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parallelProcessingNoPointerThreadanalysisOn.nim
import locks, threadpool, strutils
# compile with:
# nim c -r --threads:on -d:danger --gc:arc
{.experimental: "parallel".}
var
lock: Lock
a: seq[string]
initLock lock
proc process(p: var seq[string], s: string) =
withLock lock:
p.add(s)
when isMainModule:
parallel:
for i in 0 ..< 20:
spawn process(a, $i)
sync()
echo a
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