/// <summary>
/// Obtains all of the corresponding safe wait handles and adds a ref to each. Since the <see cref="SafeWaitHandle"/>
/// property is publically modifiable, this makes sure that we add and release refs one the same set of safe wait
/// handles to keep them alive during a multi-wait operation.
/// </summary>
private static SafeWaitHandle[] ObtainSafeWaitHandles(
RuntimeThread currentThread,
WaitHandle[] waitHandles,
out SafeWaitHandle[] rentedSafeWaitHandles)
{
Debug.Assert(currentThread == RuntimeThread.CurrentThread);
Debug.Assert(waitHandles != null);
Debug.Assert(waitHandles.Length > 0);
Debug.Assert(waitHandles.Length <= MaxWaitHandles);
rentedSafeWaitHandles = currentThread.RentWaitedSafeWaitHandleArray(waitHandles.Length);
SafeWaitHandle[] safeWaitHandles = rentedSafeWaitHandles ?? new SafeWaitHandle[waitHandles.Length];
bool success = false;
try
{
for (int i = 0; i < waitHandles.Length; ++i)
{
WaitHandle waitHandle = waitHandles[i];
if (waitHandle == null)
{
throw new ArgumentNullException("waitHandles[" + i + ']', SR.ArgumentNull_ArrayElement);
}
SafeWaitHandle safeWaitHandle = waitHandle._waitHandle;
if (safeWaitHandle == null)
{
// Throw ObjectDisposedException for backward compatibility even though it is not be representative of the issue
throw new ObjectDisposedException(null, SR.ObjectDisposed_Generic);
}
safeWaitHandle.DangerousAddRef();
safeWaitHandles[i] = safeWaitHandle;
}
success = true;
}
finally
{
if (!success)
{
for (int i = 0; i < waitHandles.Length; ++i)
{
SafeWaitHandle safeWaitHandle = safeWaitHandles[i];
if (safeWaitHandle == null)
{
break;
}
safeWaitHandle.DangerousRelease();
safeWaitHandles[i] = null;
}
if (rentedSafeWaitHandles != null)
{
currentThread.ReturnWaitedSafeWaitHandleArray(rentedSafeWaitHandles);
}
}
}
return(safeWaitHandles);
}
