private void checkAgainst(ThreadLocksTrack subject, ThreadLocksTrack target, int subjectThread, int targetThread)
{
var(obj, locks) =
subject.Report
.Where(
x => x.Value
.Select(y => y.AcqusitionState)
.Contains(ThreadLocksTrack.AcqusitionState.Intent))
.Single();
if (target.Report.ContainsKey(obj) == false)
{
// Target doesn't contain intended object
// so no deadlock can exist.
return;
}
var(tObj, tLocks) =
target.Report
.Where(
x => x.Value
.Select(y => y.AcqusitionState)
.Contains(ThreadLocksTrack.AcqusitionState.Intent))
.Single();
if (obj == tObj)
{
// The target also intents to unlock the object.
return;
}
if (subject.Report.ContainsKey(tObj) == false)
{
// The taget intents to unlock object that is not locked by subject.
return;
}
throw new DeadlockException(
subjectThread,
obj,
locks.Single(x => x.AcqusitionState == ThreadLocksTrack.AcqusitionState.Intent).LockState,
subject.Report[tObj].Last().LockState,
targetThread,
tObj,
tLocks.Single(x => x.AcqusitionState == ThreadLocksTrack.AcqusitionState.Intent).LockState,
target.Report[obj].Last().LockState);
}
private ThreadLocksTrack getTrack(int threadId)
{
if (threadsLocksTrack.TryGetValue(threadId, out var track) == false)
{
track = new ThreadLocksTrack();
#if DEBUG
if (threadsLocksTrack.TryAdd(threadId, track) == false)
{
// TODO: remove when proven that no collisions can occur.
throw new InvalidOperationException("Thread id collision.");
}
#else
threadsLocksTrack.TryAdd(threadId, track);
#endif
}
return(track);
}