public static WaitableObject FromHandle(IntPtr handle)
{
if (handle == IntPtr.Zero || handle == new IntPtr(-1))
{
WaitHandle.ThrowInvalidHandleException();
}
// We don't know if any other handles are invalid, and this may crash or otherwise do bad things, that is by
// design, IntPtr is unsafe by nature.
return((WaitableObject)GCHandle.FromIntPtr(handle).Target !);
}
public void UnsignalEvent()
{
s_lock.VerifyIsLocked();
if (!IsEvent)
{
WaitHandle.ThrowInvalidHandleException();
}
if (IsSignaled)
{
--_signalCount;
}
}
public void UnsignalEvent(ref LockHolder lockHolder)
{
s_lock.VerifyIsLocked();
if (!IsEvent)
{
lockHolder.Dispose();
WaitHandle.ThrowInvalidHandleException();
}
if (IsSignaled)
{
--_signalCount;
}
}
public void SignalMutex()
{
s_lock.VerifyIsLocked();
if (!IsMutex)
{
WaitHandle.ThrowInvalidHandleException();
}
if (IsSignaled || _ownershipInfo.Thread != RuntimeThread.CurrentThread)
{
throw new ApplicationException(SR.Arg_SynchronizationLockException);
}
if (!_ownershipInfo.TryDecrementReacquireCount())
{
SignalMutex(isAbandoned: false);
}
}
public void SignalEvent()
{
s_lock.VerifyIsLocked();
switch (_type)
{
case WaitableObjectType.ManualResetEvent:
SignalManualResetEvent();
break;
case WaitableObjectType.AutoResetEvent:
SignalAutoResetEvent();
break;
default:
WaitHandle.ThrowInvalidHandleException();
break;
}
}
public int SignalSemaphore(int count)
{
s_lock.VerifyIsLocked();
Debug.Assert(count > 0);
if (!IsSemaphore)
{
WaitHandle.ThrowInvalidHandleException();
}
int oldSignalCount = _signalCount;
Debug.Assert(oldSignalCount <= _maximumSignalCount);
if (count > _maximumSignalCount - oldSignalCount)
{
throw new SemaphoreFullException();
}
if (oldSignalCount != 0)
{
Debug.Assert(_waitersHead == null);
Debug.Assert(_waitersTail == null);
_signalCount = oldSignalCount + count;
return(oldSignalCount);
}
for (ThreadWaitInfo.WaitedListNode waiterNode = _waitersHead, nextWaiterNode;
waiterNode != null;
waiterNode = nextWaiterNode)
{
// Signaling the waiter will unregister the waiter node, so keep the next node before trying
nextWaiterNode = waiterNode.Next;
if (waiterNode.WaitInfo.TrySignalToSatisfyWait(waiterNode, isAbandonedMutex: false) && --count == 0)
{
return(oldSignalCount);
}
}
_signalCount = count;
return(oldSignalCount);
}