public void AlreadyOwnedTwoInnerLocks()
{
DateTime start, end;
object monitor = new object();
lock (monitor)
{
start = DateTime.UtcNow;
for (int i = 0; i < Iterations; i++)
{
lock (monitor)
{
}
}
end = DateTime.UtcNow;
}
TimeSpan nativeTime = end - start;
OrderedLock orderedLock = new OrderedLock(Timeout.Infinite);
OrderedLock inner1 = new OrderedLock(Timeout.Infinite);
OrderedLock inner2 = new OrderedLock(Timeout.Infinite);
orderedLock.InnerLock = inner1;
inner1.InnerLock = inner2;
using (orderedLock.Lock())
{
start = DateTime.UtcNow;
for (int i = 0; i < Iterations; i++)
{
using (orderedLock.Lock())
{
}
}
end = DateTime.UtcNow;
}
TimeSpan syncLockTime = end - start;
double factor = syncLockTime.TotalMilliseconds / nativeTime.TotalMilliseconds;
Console.WriteLine("Performance with two inner locks (lock already owned):");
Console.WriteLine("Native: {0}", nativeTime);
Console.WriteLine("OrderedLock: {0}", syncLockTime);
Console.WriteLine("Performance penalty factor: {0:0.00}", factor);
Console.WriteLine();
Assert.IsTrue(factor < 10, "OrderedLock must not be ridiculously slow");
}
public void InitialNoInnerLocks()
{
object monitor = new object();
DateTime start = DateTime.UtcNow;
for (int i = 0; i < Iterations; i++)
{
lock (monitor)
{
}
}
DateTime end = DateTime.UtcNow;
TimeSpan nativeTime = end - start;
OrderedLock syncLock = new OrderedLock(Timeout.Infinite);
start = DateTime.UtcNow;
for (int i = 0; i < Iterations; i++)
{
using (syncLock.Lock())
{
}
}
end = DateTime.UtcNow;
TimeSpan syncLockTime = end - start;
double factor = syncLockTime.TotalMilliseconds / nativeTime.TotalMilliseconds;
Console.WriteLine("Performance with no inner locks (initial acquisition):");
Console.WriteLine("Native: {0}", nativeTime);
Console.WriteLine("OrderedLock: {0}", syncLockTime);
Console.WriteLine("Performance penalty factor: {0:0.00}", factor);
Console.WriteLine();
Assert.IsTrue(factor < 10, "OrderedLock must not be ridiculously slow");
}