## Printer Device Driver

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### Differences Between GenPLib Semaphores and Kernel Semaphores

If a nonzero request time times out, it will timeout to within 30 milliseconds of the supplied time out.

DosQueryMutexSem returns a process and thread ID even if the MUTEX sem is unowned; that is, the count returned is zero. This semaphore package returns process and thread ID of zero when the semaphore is unowned regardless of 386 or 486.