public void AbandonExisting(
string name,
WaitHandleWaitType waitType,
int waitCount,
int notAbandonedWaitIndex,
bool isNotAbandonedWaitObjectSignaled,
bool abandonDuringWait)
{
ThreadTestHelpers.RunTestInBackgroundThread(() =>
{
using (var m = new Mutex(false, name))
using (Mutex m2 = waitCount == 1 ? null : new Mutex(false, name == null ? null : name + "_2"))
using (ManualResetEvent e = waitCount == 1 ? null : new ManualResetEvent(isNotAbandonedWaitObjectSignaled))
using (ManualResetEvent threadReadyForAbandon = abandonDuringWait ? new ManualResetEvent(false) : null)
using (ManualResetEvent abandonSoon = abandonDuringWait ? new ManualResetEvent(false) : null)
{
WaitHandle[] waitHandles = null;
if (waitType != WaitHandleWaitType.WaitOne)
{
waitHandles = new WaitHandle[waitCount];
if (waitCount == 1)
{
waitHandles[0] = m;
}
else
{
waitHandles[notAbandonedWaitIndex] = e;
waitHandles[notAbandonedWaitIndex == 0 ? 1 : 0] = m;
waitHandles[notAbandonedWaitIndex == 2 ? 1 : 2] = m2;
}
}
Thread t = ThreadTestHelpers.CreateGuardedThread(out Action waitForThread, () =>
{
Assert.True(m.WaitOne(0));
if (m2 != null)
{
Assert.True(m2.WaitOne(0));
}
if (abandonDuringWait)
{
threadReadyForAbandon.Set();
abandonSoon.CheckedWait();
Thread.Sleep(ThreadTestHelpers.ExpectedTimeoutMilliseconds);
}
// don't release the mutexes; abandon them on this thread
});
t.IsBackground = true;
t.Start();
if (abandonDuringWait)
{
threadReadyForAbandon.CheckedWait();
abandonSoon.Set();
}
else
{
waitForThread();
}
AbandonedMutexException ame;
switch (waitType)
{
case WaitHandleWaitType.WaitOne:
ame =
AssertExtensions.Throws <AbandonedMutexException, bool>(
() => m.WaitOne(ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
Assert.Equal(-1, ame.MutexIndex);
Assert.Null(ame.Mutex);
break;
case WaitHandleWaitType.WaitAny:
if (waitCount != 1 && isNotAbandonedWaitObjectSignaled && notAbandonedWaitIndex == 0)
{
Assert.Equal(0, WaitHandle.WaitAny(waitHandles, 0));
AssertExtensions.Throws <AbandonedMutexException, bool>(
() => m.WaitOne(ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
AssertExtensions.Throws <AbandonedMutexException, bool>(
() => m2.WaitOne(ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
break;
}
if (waitCount != 1 && isNotAbandonedWaitObjectSignaled && notAbandonedWaitIndex != 0)
{
ame =
Assert.Throws <AbandonedMutexException>(() =>
{
ThreadTestHelpers.WaitForCondition(() =>
{
// Actually expecting an exception from WaitAny(), but there may be a delay before
// the mutex is actually released and abandoned. If there is no exception, the
// WaitAny() must have succeeded due to the event being signaled.
int r = WaitHandle.WaitAny(waitHandles, ThreadTestHelpers.UnexpectedTimeoutMilliseconds);
Assert.Equal(notAbandonedWaitIndex, r);
return(false);
});
});
}
else
{
ame =
AssertExtensions.Throws <AbandonedMutexException, int>(
() => WaitHandle.WaitAny(waitHandles, ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
}
// Due to a potential delay in abandoning mutexes, either mutex may have been seen to be
// abandoned first
Assert.True(ame.Mutex == m || (m2 != null && ame.Mutex == m2));
int mIndex = waitCount != 1 && notAbandonedWaitIndex == 0 ? 1 : 0;
int m2Index = waitCount != 1 && notAbandonedWaitIndex == 2 ? 1 : 2;
if (ame.Mutex == m)
{
Assert.Equal(mIndex, ame.MutexIndex);
}
else
{
Assert.True(m2Index < notAbandonedWaitIndex);
Assert.Equal(m2Index, ame.MutexIndex);
}
// Verify that the other mutex also gets abandoned
if (ame.MutexIndex == mIndex)
{
if (m2 != null)
{
AssertExtensions.Throws <AbandonedMutexException, bool>(
() => m2.WaitOne(ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
}
}
else
{
AssertExtensions.Throws <AbandonedMutexException, bool>(
() => m.WaitOne(ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
}
break;
case WaitHandleWaitType.WaitAll:
if (waitCount != 1 && !isNotAbandonedWaitObjectSignaled)
{
Assert.False(WaitHandle.WaitAll(waitHandles, ThreadTestHelpers.ExpectedTimeoutMilliseconds * 2));
Assert.True(e.Set());
}
ame =
AssertExtensions.Throws <AbandonedMutexException, bool>(
() => WaitHandle.WaitAll(waitHandles, ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
Assert.Equal(-1, ame.MutexIndex);
Assert.Null(ame.Mutex);
break;
}
if (abandonDuringWait)
{
waitForThread();
}
m.ReleaseMutex();
m2?.ReleaseMutex();
}
});
}
public void AbandonExisting(
string name,
WaitHandleWaitType waitType,
int waitCount,
int notAbandonedWaitIndex,
bool isNotAbandonedWaitObjectSignaled,
bool abandonDuringWait)
{
ThreadTestHelpers.RunTestInBackgroundThread(() =>
{
using (var m = new Mutex(false, name))
using (Mutex m2 = waitCount == 1 ? null : new Mutex(false, name == null ? null : name + "_2"))
using (ManualResetEvent e = waitCount == 1 ? null : new ManualResetEvent(isNotAbandonedWaitObjectSignaled))
using (ManualResetEvent threadReadyForAbandon = abandonDuringWait ? new ManualResetEvent(false) : null)
using (ManualResetEvent abandonSoon = abandonDuringWait ? new ManualResetEvent(false) : null)
{
WaitHandle[] waitHandles = null;
if (waitType != WaitHandleWaitType.WaitOne)
{
waitHandles = new WaitHandle[waitCount];
if (waitCount == 1)
{
waitHandles[0] = m;
}
else
{
waitHandles[notAbandonedWaitIndex] = e;
waitHandles[notAbandonedWaitIndex == 0 ? 1 : 0] = m;
waitHandles[notAbandonedWaitIndex == 2 ? 1 : 2] = m2;
}
}
Thread t = ThreadTestHelpers.CreateGuardedThread(out Action waitForThread, () =>
{
Assert.True(m.WaitOne(0));
if (m2 != null)
{
Assert.True(m2.WaitOne(0));
}
if (abandonDuringWait)
{
threadReadyForAbandon.Set();
abandonSoon.CheckedWait();
Thread.Sleep(ThreadTestHelpers.ExpectedTimeoutMilliseconds);
}
// don't release the mutexes; abandon them on this thread
});
t.IsBackground = true;
t.Start();
if (abandonDuringWait)
{
threadReadyForAbandon.CheckedWait();
abandonSoon.Set();
}
else
{
waitForThread();
}
AbandonedMutexException ame;
switch (waitType)
{
case WaitHandleWaitType.WaitOne:
ame =
AssertExtensions.Throws <AbandonedMutexException, bool>(
() => m.WaitOne(ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
Assert.Equal(-1, ame.MutexIndex);
Assert.Null(ame.Mutex);
break;
case WaitHandleWaitType.WaitAny:
if (waitCount != 1 && isNotAbandonedWaitObjectSignaled && notAbandonedWaitIndex == 0)
{
Assert.Equal(0, WaitHandle.WaitAny(waitHandles, 0));
AssertExtensions.Throws <AbandonedMutexException, bool>(
() => m.WaitOne(ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
}
else
{
ame =
AssertExtensions.Throws <AbandonedMutexException, int>(
() => WaitHandle.WaitAny(waitHandles, ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
Assert.Equal(waitCount != 1 && notAbandonedWaitIndex == 0 ? 1 : 0, ame.MutexIndex);
Assert.Equal(m, ame.Mutex);
}
if (m2 != null)
{
AssertExtensions.Throws <AbandonedMutexException, bool>(
() => m2.WaitOne(ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
}
break;
case WaitHandleWaitType.WaitAll:
if (waitCount != 1 && !isNotAbandonedWaitObjectSignaled)
{
Assert.False(WaitHandle.WaitAll(waitHandles, ThreadTestHelpers.ExpectedTimeoutMilliseconds * 2));
Assert.True(e.Set());
}
ame =
AssertExtensions.Throws <AbandonedMutexException, bool>(
() => WaitHandle.WaitAll(waitHandles, ThreadTestHelpers.UnexpectedTimeoutMilliseconds));
Assert.Equal(-1, ame.MutexIndex);
Assert.Null(ame.Mutex);
break;
}
if (abandonDuringWait)
{
waitForThread();
}
m.ReleaseMutex();
m2?.ReleaseMutex();
}
});
}