// Adds Houdini to the pipeline if the user has not done so
public void AddHoudiniEngine()
{
foreach (Engine engine in Engines)
{
if (engine is VanillaHoudini)
{
houdiniEngine = (VanillaHoudini)engine;
}
}
if (houdiniEngine == null)
{
houdiniEngine = new VanillaHoudini(GetNextSMTEngineID(),
SMTEngine.GetSolverParameter().DefaultValue,
SMTEngine.GetErrorLimitParameter().DefaultValue);
Engines.Add(houdiniEngine);
}
}
private Houdini.HoudiniOutcome ScheduleEnginesInParallel(Pipeline pipeline)
{
Houdini.HoudiniOutcome outcome = null;
CancellationTokenSource tokenSource = new CancellationTokenSource();
List <Task> underApproximatingTasks = new List <Task>();
List <Task> overApproximatingTasks = new List <Task>();
// Schedule the under-approximating engines first
foreach (Engine engine in pipeline.GetEngines())
{
if (!(engine is VanillaHoudini))
{
if (engine is DynamicAnalysis)
{
DynamicAnalysis dynamicEngine = (DynamicAnalysis)engine;
underApproximatingTasks.Add(Task.Factory.StartNew(
() =>
{
dynamicEngine.Start(getFreshProgram(true, false));
},
tokenSource.Token));
}
else
{
SMTEngine smtEngine = (SMTEngine)engine;
underApproximatingTasks.Add(Task.Factory.StartNew(
() =>
{
smtEngine.Start(getFreshProgram(true, true), ref outcome);
},
tokenSource.Token));
}
}
}
if (pipeline.runHoudini)
{
// We set a barrier on the under-approximating engines if a Houdini delay
// is specified or no sliding is selected
if (pipeline.GetHoudiniEngine().Delay > 0)
{
Print.VerboseMessage("Waiting at barrier until Houdini delay has elapsed or all under-approximating engines have finished");
Task.WaitAll(underApproximatingTasks.ToArray(), pipeline.GetHoudiniEngine().Delay * 1000);
}
else if (pipeline.GetHoudiniEngine().SlidingSeconds > 0)
{
Print.VerboseMessage("Waiting at barrier until all under-approximating engines have finished");
Task.WaitAll(underApproximatingTasks.ToArray());
}
// Schedule the vanilla Houdini engine
overApproximatingTasks.Add(Task.Factory.StartNew(
() =>
{
pipeline.GetHoudiniEngine().Start(getFreshProgram(true, true), ref outcome);
},
tokenSource.Token));
// Schedule Houdinis every x seconds until the number of new Houdini instances exceeds the limit
if (pipeline.GetHoudiniEngine().SlidingSeconds > 0)
{
int numOfRefuted = Houdini.ConcurrentHoudini.RefutedSharedAnnotations.Count;
int newHoudinis = 0;
bool runningHoudinis;
do
{
// Wait before launching new Houdini instances
Thread.Sleep(pipeline.GetHoudiniEngine().SlidingSeconds * 1000);
// Only launch a fresh Houdini if the candidate invariant set has changed
if (Houdini.ConcurrentHoudini.RefutedSharedAnnotations.Count > numOfRefuted)
{
numOfRefuted = Houdini.ConcurrentHoudini.RefutedSharedAnnotations.Count;
VanillaHoudini newHoudiniEngine = new VanillaHoudini(pipeline.GetNextSMTEngineID(),
pipeline.GetHoudiniEngine().Solver,
pipeline.GetHoudiniEngine().ErrorLimit);
pipeline.AddEngine(newHoudiniEngine);
Print.VerboseMessage("Scheduling another Houdini instance");
overApproximatingTasks.Add(Task.Factory.StartNew(
() =>
{
newHoudiniEngine.Start(getFreshProgram(true, true), ref outcome);
tokenSource.Cancel(false);
},
tokenSource.Token));
++newHoudinis;
}
// Are any Houdinis still running?
runningHoudinis = false;
foreach (Task task in overApproximatingTasks)
{
if (task.Status.Equals(TaskStatus.Running))
{
runningHoudinis = true;
}
}
} while (newHoudinis < pipeline.GetHoudiniEngine().SlidingLimit&& runningHoudinis);
}
try
{
Task.WaitAny(overApproximatingTasks.ToArray(), tokenSource.Token);
tokenSource.Cancel(false);
}
catch (OperationCanceledException e)
{
Console.WriteLine("Unexpected exception: " + e);
throw;
}
}
else
{
Task.WaitAll(underApproximatingTasks.ToArray());
}
return(outcome);
}