De itt is valami szemaforról van szó, nekem is új a téma:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/createsemaphore.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/releasesemaphore.asp

"semaphore timeout" error

http://www.experts-exchange.com/Networking/Broadband/VPN/Q_20383076.html