internal static int WaitOneNative(SafeWaitHandle waitableSafeHandle, long millisecondsTimeout)
{
Debug.Assert(millisecondsTimeout >= -1 && millisecondsTimeout <= int.MaxValue);
waitableSafeHandle.DangerousAddRef();
try
{
return(LowLevelThread.WaitForSingleObject(waitableSafeHandle.DangerousGetHandle(), (int)millisecondsTimeout));
}
finally
{
waitableSafeHandle.DangerousRelease();
}
}
private static int MakeForCurrentThread()
{
//
// Get the current thread handle. We need to use DuplicateHandle, because GetCurrentThread returns a pseudo-handle
// that cannot be used outside of this thread.
//
IntPtr thisNativeThreadHandle;
Interop.mincore.DuplicateHandle(
Interop.mincore.GetCurrentProcess(),
Interop.mincore.GetCurrentThread(),
Interop.mincore.GetCurrentProcess(),
out thisNativeThreadHandle,
0,
false,
(uint)Interop.Constants.DuplicateSameAccess);
//
// First, search for a dead thread, so we can reuse its thread ID
//
for (ManagedThreadId current = s_list; current != null; current = current._next)
{
//
// Try to take the lock on this ID. If another thread already has it, just move on to the next ID.
//
if (Interlocked.Exchange(ref current._lock, 1) != 0)
{
continue;
}
try
{
//
// Does the ID currently belong to a dead thread?
//
if (LowLevelThread.WaitForSingleObject(current._nativeThreadHandle, 0) == (uint)Interop.Constants.WaitObject0)
{
//
// The thread is dead. We can claim this ID by swapping in our own thread handle.
//
Interop.mincore.CloseHandle(current._nativeThreadHandle);
current._nativeThreadHandle = thisNativeThreadHandle;
t_currentManagedThreadId = current._managedThreadId;
return(current._managedThreadId);
}
}
finally
{
//
// Release the lock.
//
current._lock = 0;
}
}
//
// We couldn't find a dead thread, so we can't reuse a thread ID. Create a new one.
//
ManagedThreadId newManagedThreadId = new ManagedThreadId(Interlocked.Increment(ref s_nextThreadId));
newManagedThreadId._nativeThreadHandle = thisNativeThreadHandle;
while (true)
{
ManagedThreadId oldList = s_list;
newManagedThreadId._next = oldList;
if (Interlocked.CompareExchange(ref s_list, newManagedThreadId, oldList) == oldList)
{
t_currentManagedThreadId = newManagedThreadId._managedThreadId;
return(newManagedThreadId._managedThreadId);
}
}
}
