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Spinlock synchronization in parallel threads runner #4

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Jul 4, 2019
Merged

Spinlock synchronization in parallel threads runner #4

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8 changes: 5 additions & 3 deletions lincheck/src/main/java/org/jetbrains/kotlinx/lincheck/strategy/stress/StressStrategy.java
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.Phaser;
import java.util.concurrent.atomic.AtomicInteger;

/**
* This strategy
Expand All @@ -46,6 +46,7 @@ public class StressStrategy extends Strategy {
private final Runner runner;

private final List<int[]> waits;
private final AtomicInteger uninitializedThreads = new AtomicInteger(0); // for threads synchronization

public StressStrategy(Class<?> testClass, ExecutionScenario scenario,
Verifier verifier, StressCTestConfiguration testCfg, Reporter reporter)
Expand All @@ -60,12 +61,12 @@ public StressStrategy(Class<?> testClass, ExecutionScenario scenario,
}
}
// Create runner
Phaser phaser = new Phaser(testCfg.threads);
runner = new ParallelThreadsRunner(scenario, this, testClass, null) {
@Override
public void onStart(int iThread) {
super.onStart(iThread);
phaser.arriveAndAwaitAdvance();
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uninitializedThreads.decrementAndGet(); // this thread has finished initialization
while (uninitializedThreads.get() != 0) {} // wait for other threads to start
}
};
}
Expand All @@ -84,6 +85,7 @@ public void run() throws InterruptedException {
}
}
}
uninitializedThreads.set(scenario.parallelExecution.size()); // reinit synchronization
verifyResults(runner.run());
}
} finally {
Expand Down