private static SynchronizationContext GetWinRTContext()
{
// Optimization: WinRT dispatchers are supported for STA and ASTA apartment types only
if (Thread.GetCurrentApartmentType() != Thread.ApartmentType.STA)
{
return(null);
}
object dispatcher = WinRTInterop.Callbacks.GetCurrentWinRTDispatcher();
if (dispatcher == null)
{
return(null);
}
return(s_winRTContextCache.GetValue(dispatcher, _dispatcher => new WinRTSynchronizationContext(_dispatcher)));
}
private static unsafe int WaitForMultipleObjectsIgnoringSyncContext(IntPtr *pHandles, int numHandles, bool waitAll, int millisecondsTimeout)
{
Debug.Assert(millisecondsTimeout >= -1);
//
// In the CLR, we use CoWaitForMultipleHandles to pump messages while waiting in an STA. In that case, we cannot use WAIT_ALL.
// That's because the wait would only be satisfied if a message arrives while the handles are signalled.
//
if (waitAll)
{
if (numHandles == 1)
{
waitAll = false;
}
else if (Thread.GetCurrentApartmentType() == Thread.ApartmentType.STA)
{
throw new NotSupportedException(SR.NotSupported_WaitAllSTAThread);
}
}
Thread currentThread = Thread.CurrentThread;
currentThread.SetWaitSleepJoinState();
int result;
if (Thread.ReentrantWaitsEnabled)
{
Debug.Assert(!waitAll);
result = RuntimeImports.RhCompatibleReentrantWaitAny(false, millisecondsTimeout, numHandles, pHandles);
}
else
{
result = (int)Interop.Kernel32.WaitForMultipleObjectsEx((uint)numHandles, (IntPtr)pHandles, waitAll, (uint)millisecondsTimeout, false);
}
currentThread.ClearWaitSleepJoinState();
if (result == Interop.Kernel32.WAIT_FAILED)
{
int errorCode = Interop.mincore.GetLastError();
if (waitAll && errorCode == Interop.Errors.ERROR_INVALID_PARAMETER)
{
// Check for duplicate handles. This is a brute force O(n^2) search, which is intended since the typical
// array length is short enough that this would actually be faster than using a hash set. Also, the worst
// case is not so bad considering that the array length is limited by
// <see cref="WaitHandle.MaxWaitHandles"/>.
for (int i = 1; i < numHandles; ++i)
{
IntPtr handle = pHandles[i];
for (int j = 0; j < i; ++j)
{
if (pHandles[j] == handle)
{
throw new DuplicateWaitObjectException("waitHandles[" + i + ']');
}
}
}
}
ThrowWaitFailedException(errorCode);
}
return(result);
}
