Microsoft KB Archive/133090

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Using Thunks with Windows 95 Printer Driver

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Q133090

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The information in this article applies to:


 * Microsoft Win32 Device Driver Kit (DDK) for Windows NT, version 4.0

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A Windows 95 printer driver should only use thunks in calls to the ABORTDOC, ENDDOC, NEWFRAME, NEXTBAND and STARTDOC subfunctions of its Control function.

If a Windows 95 printer driver thunks in any call other than a ABORTDOC, ENDDOC, NEWFRAME, NEXTBAND or STARTDOC call, the Windows graphics device interface (GDI) may become reentrant. Because the GDI was never designed to be reentrant, the system may be left in an unstable state or errors may occur. If the printer driver thunks or yields, this causes the Win16Mutex system semaphore to be released and another thread may enter the GDI.

Additional query words: 4.00 win95

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Technology : kbAudDeveloper kbWinDDKSearch kbWin32sSearch kbWin32DDKSearch kbWin32DDKNT400 kbWin32DDKNTSearch