Hello Everybody, According to Microsoft's documentation:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa365141%28v=vs.85%29.aspx > Asynchronous (overlapped) read and write operations are not supported by > anonymous pipes. This means that you cannot use the ReadFileEx and > WriteFileEx functions with anonymous pipes. In addition, the lpOverlapped > parameter of ReadFile and WriteFile is ignored when these functions are used > with anonymous pipes. That's why Zoran and I ruled out using unnamed pipes. Named pipes don't seem a good alternative either for several reasons, the least of them being the need to create a name on the fly. However, the entire asynchronous IO in Windows is really messy business, since the entire mechanism of processing IO notifications is tied to a window. -- Ibrahim On 28-Jan-12 19:03, Stephen Deasey wrote: > On Sat, Jan 28, 2012 at 1:26 PM, Zoran Vasiljevic<z...@archiware.com> wrote: >> >> On Windows there are some limitations as how you can >> do non-blocking operations... In particular, there >> seems to be a problem with non-blocking reads/writes >> on unnamed pipes... They simply do not work on windows, >> at least as to our knowledge. > > I don't know anything about Windows, but i t looks like PIPE_NOWAIT > switches to non-blocking mode but is a legacy of ye olde lan manager, > and instead you should use overlapped IO with the FILE_FLAG_OVERLAPPED > flag: > > > http://msdn.microsoft.com/en-us/library/windows/desktop/aa365788%28v=vs.85%29.aspx > > This is all with named pipes. But it says the followinf about anon pipes: > > Anonymous pipes are implemented using a named pipe with > a unique name. Therefore, you can often pass a handle to an > anonymous pipe to a function that requires a handle to a named pipe. > > So maybe you can substitute a named pipe with the appropriate flags > for the anon pipe? ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ naviserver-devel mailing list naviserver-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/naviserver-devel
