Race condition With Threads
package com.glassthought.sandbox
class RaceConditionInducer {
private var value = 0
// @Synchronized // would fix this example race condition.
fun incrementValue() {
val storedValue = value
Thread.sleep(10)
println("Incrementing value from storedValue=$storedValue to ${storedValue + 1}")
value = storedValue + 1
}
fun getValue() = value
}
fun main() {
val raceConditionInducer = RaceConditionInducer()
val threads = (1..10).map {
Thread { raceConditionInducer.incrementValue() }
}
threads.forEach { it.start() }
threads.forEach { it.join() }
println("Value: ${raceConditionInducer.getValue()}")
}
Command to reproduce:
gt.sandbox.checkout.commit 0b65495f3299ff186efc \
&& cd "${GT_SANDBOX_REPO}" \
&& cmd.run.announce "./gradlew run"
Recorded output of command:
> Task :app:checkKotlinGradlePluginConfigurationErrors SKIPPED
> Task :app:processResources NO-SOURCE
> Task :app:compileKotlin
> Task :app:compileJava NO-SOURCE
> Task :app:classes UP-TO-DATE
> Task :app:run
Incrementing value from storedValue=0 to 1
Incrementing value from storedValue=0 to 1
Incrementing value from storedValue=0 to 1
Incrementing value from storedValue=0 to 1
Incrementing value from storedValue=0 to 1
Incrementing value from storedValue=0 to 1
Incrementing value from storedValue=0 to 1
Incrementing value from storedValue=0 to 1
Incrementing value from storedValue=0 to 1
Incrementing value from storedValue=0 to 1
Value: 1
BUILD SUCCESSFUL in 1s
2 actionable tasks: 2 executed
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