.NET Semaphore Creation Fails with IoException Error in Win 2008

Question

The following code does not work for me in Windows 2008. It succeeds in Win7.

return new Semaphore(1, 1, "my-test-semaphore");

I get the following error:

System.IO.IOException: The specified port does not exist.
  at System.IO.Ports.InternalResources.WinIOError(Int32 errorCode, String str)
  at System.IO.Ports.InternalResources.WinIOError()
  at System.Threading.Semaphore..ctor(Int32 initialCount, Int32 maximumCount, String name)
  at Throttle.Program.CreateSemaphore(String passthroughApplication)
  at Throttle.Program.Main(String[] args)

I searched and cannot find an explanation. Does anyone have any idea?

Answer 1

You are a victim of error in error messages. The exception message is strange because the WinIOError () method it uses is shared with the SerialPort class. When the Windows error code is 2 (file not found) or 3 (path not found), you will receive an exception message that is only suitable for the serial port. Therefore, weirdo's message "The specified port does not exist."

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