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// #2417
object Test {
def parallel(numThreads: Int)(block: => Unit) {
var failure: Throwable = null
val threads = Array.tabulate(numThreads)(i => new Thread {
override def run {
try {
block
} catch {
case x: Throwable => failure = x
}
}
})
for (t <- threads) t.start
for (t <- threads) t.join
if (failure != null) println("FAILURE: " + failure)
}
def testSet(initialSize: Int, numThreads: Int, passes: Int) {
val orig = Set.empty ++ (1 to initialSize)
parallel(numThreads) {
for (pass <- 0 until passes) {
var s = orig
for (e <- (initialSize to 1 by -1)) {
s -= e
val obs = s.size
if (obs != e - 1) {
throw new Exception("removed e=" + e + ", size was " + obs + ", s=" + s)
}
}
}
}
}
def testMap(initialSize: Int, numThreads: Int, passes: Int) {
val orig = Map.empty ++ ((1 to initialSize) map ((_,"v")))
parallel(numThreads) {
for (pass <- 0 until passes) {
var m = orig
for (e <- (initialSize to 1 by -1)) {
m -= e
val obs = m.size
if (obs != e - 1) {
throw new Exception("removed e=" + e + ", size was " + obs + ", m=" + m)
}
}
}
}
}
def main(args: Array[String]) {
println("testing small Map that doesn't promote to HashMap...")
testMap(4, 2, 1000000)
println()
println("testing single-threaded HashMap use...")
testMap(5, 1, 1000000)
println()
println("testing HashMap.size from multiple threads...")
testMap(5, 2, 1000000)
println()
println("testing small Set that doesn't promote to HashSet...")
testSet(4, 2, 1000000)
println()
println("testing single-threaded HashSet use...")
testSet(5, 1, 1000000)
println()
println("testing HashSet.size from multiple threads...")
testSet(5, 2, 1000000)
println()
}
}
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