/// <summary>
/// Runs all tests under each SyncBlk variation
/// </summary>
/// <param name="lockIsHeld">Whether to expect that the lock is being held (experiencing
/// contention) while each lock attempt is performed</param>
/// <param name="scenario">A lock contention scenario to run under each SyncBlk scenario. Is
/// passed an object that may or may not have a SyncBlk, and a lock acquisition scenario to run
/// under that level of contention</param>
void SyncBlkVariants(LockIsHeld lockIsHeld, Action <object, Action <object> > scenario)
{
Console.WriteLine("Positive tests, no SyncBlk");
MethodVariants(lockIsHeld, delegate(Action <object> innerScenario)
{
object obj = new object();
scenario(obj, delegate(object o) { innerScenario(o); });
});
Console.WriteLine("Positive tests, with HashCode");
MethodVariants(lockIsHeld, delegate(Action <object> innerScenario)
{
object obj = new object();
obj.GetHashCode();
scenario(obj, delegate(object o) { innerScenario(o); });
});
Console.WriteLine("Positive tests, with SyncBlk");
MethodVariants(lockIsHeld, delegate(Action <object> innerScenario)
{
object obj = new object();
obj.GetHashCode();
Monitor.Enter(obj);
Monitor.Exit(obj);
scenario(obj, delegate(object o) { innerScenario(o); });
});
}
LockIsHeld Reverse(LockIsHeld lockIsHeld)
{
switch (lockIsHeld)
{
case LockIsHeld.Yes:
return(LockIsHeld.No);
case LockIsHeld.No:
return(LockIsHeld.Yes);
default:
return(lockIsHeld);
}
}
void AssertTookLockAndRelease(LockIsHeld expected, object obj, bool tookLock)
{
Assert((expected == LockIsHeld.Yes && tookLock) ||
(expected == LockIsHeld.No && !tookLock) ||
expected == LockIsHeld.Maybe);
if (tookLock)
{
Assert(!inContention);
}
bool exitFailed = false;
try
{
Monitor.Exit(obj);
}
catch (SynchronizationLockException)
{
exitFailed = true;
}
Assert(tookLock == !exitFailed);
}
/// <summary>
/// Runs all lock acquisition scenarios inside of an outer contention/SyncBlk scenario
/// </summary>
/// <param name="lockIsHeld">whether to expect the lock to be held when we try to acquire it</param>
/// <param name="scenario">The contention/SyncBlk scenario to run each acquisition scenario inside of.</param>
void MethodVariants(LockIsHeld lockIsHeld, Action <Action <object> > scenario)
{
bool tookLock;
scenario(delegate(object obj)
{
Monitor.Enter(obj);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
});
scenario(delegate(object obj)
{
tookLock = false;
Monitor.Enter(obj, ref tookLock);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = Monitor.TryEnter(obj);
AssertTookLockAndRelease(Reverse(lockIsHeld), obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = Monitor.TryEnter(obj, 0);
AssertTookLockAndRelease(Reverse(lockIsHeld), obj, tookLock);
});
scenario(delegate(object obj)
{
DateTime start = DateTime.Now;
tookLock = Monitor.TryEnter(obj, 10000);
double elapsed = (DateTime.Now - start).TotalSeconds;
AssertTookLockAndRelease(elapsed < 5.0 ? LockIsHeld.Yes : LockIsHeld.Maybe, obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = Monitor.TryEnter(obj, Timeout.Infinite);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = Monitor.TryEnter(obj, TimeSpan.FromMilliseconds(0));
AssertTookLockAndRelease(Reverse(lockIsHeld), obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = Monitor.TryEnter(obj, TimeSpan.FromMilliseconds(10000));
AssertTookLockAndRelease(LockIsHeld.Maybe, obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = Monitor.TryEnter(obj, TimeSpan.FromMilliseconds(Timeout.Infinite));
AssertTookLockAndRelease(LockIsHeld.Yes, obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = false;
Monitor.TryEnter(obj, ref tookLock);
AssertTookLockAndRelease(Reverse(lockIsHeld), obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = false;
Monitor.TryEnter(obj, 0, ref tookLock);
AssertTookLockAndRelease(Reverse(lockIsHeld), obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = false;
Monitor.TryEnter(obj, 10000, ref tookLock);
AssertTookLockAndRelease(LockIsHeld.Maybe, obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = false;
Monitor.TryEnter(obj, Timeout.Infinite, ref tookLock);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = false;
Monitor.TryEnter(obj, TimeSpan.FromMilliseconds(0), ref tookLock);
AssertTookLockAndRelease(Reverse(lockIsHeld), obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = false;
Monitor.TryEnter(obj, TimeSpan.FromMilliseconds(10000), ref tookLock);
AssertTookLockAndRelease(LockIsHeld.Maybe, obj, tookLock);
});
scenario(delegate(object obj)
{
tookLock = false;
Monitor.TryEnter(obj, TimeSpan.FromMilliseconds(Timeout.Infinite), ref tookLock);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, tookLock);
});
if (lockIsHeld == LockIsHeld.No)
{
scenario(delegate(object obj)
{
Monitor.Enter(obj);
Monitor.Enter(obj);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
AssertTookLockAndRelease(LockIsHeld.No, obj, false);
});
scenario(delegate(object obj)
{
Monitor.Enter(obj);
tookLock = false;
Monitor.Enter(obj, ref tookLock);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, tookLock);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
AssertTookLockAndRelease(LockIsHeld.No, obj, false);
});
scenario(delegate(object obj)
{
Monitor.Enter(obj);
tookLock = false;
Monitor.TryEnter(obj, ref tookLock);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, tookLock);
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
AssertTookLockAndRelease(LockIsHeld.No, obj, false);
});
scenario(delegate(object obj)
{
Monitor.Enter(obj);
for (int i = 0; i < 70; i++)
{
Monitor.Enter(obj);
}
for (int i = 0; i < 70; i++)
{
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
}
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
AssertTookLockAndRelease(LockIsHeld.No, obj, false);
});
scenario(delegate(object obj)
{
Monitor.Enter(obj);
for (int i = 0; i < 70; i++)
{
tookLock = false;
Monitor.Enter(obj, ref tookLock);
Assert(tookLock);
}
for (int i = 0; i < 70; i++)
{
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
}
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
AssertTookLockAndRelease(LockIsHeld.No, obj, false);
});
scenario(delegate(object obj)
{
Monitor.Enter(obj);
for (int i = 0; i < 70; i++)
{
tookLock = false;
Monitor.TryEnter(obj, ref tookLock);
Assert(tookLock);
}
for (int i = 0; i < 70; i++)
{
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
}
AssertTookLockAndRelease(LockIsHeld.Yes, obj, true);
AssertTookLockAndRelease(LockIsHeld.No, obj, false);
});
}
}