On Thu, Aug 02, 2018 at 01:58:37AM +0200, Pavel Sanda wrote: > Will S wrote: > > I have been helping a user debug a problem with a tool (LyZ, > > https://github.com/willsALMANJ/lyz) that I maintain that interfaces with > > LyX through the LyX server. The main symptom is that the lyxserver.out file > > appears to be empty. Specifically, when LyZ writes a command into > > lyxserver.in, LyX performs that command as normal (so the "statistics" > > command causes the statistics window to pop up in LyX), but when a command > > (like "server-get-filename") is run that requires a response from LyX that > > response does not get written to lyxserver.out (lyxserver.out still appears > > empty). This problem is seen on some Windows systems but not all. More > > details about the specific issue can be found at this page: > > https://github.com/willsALMANJ/lyz/issues/14 > > > > Are there any techniques we could use to debug this issue further? It seems > > Shot in the dark: buffering output to lyxserver.out? If this was the cause > then running "server-get-filename" 100x times will at certain moment output > the whole buffer with all answers at once.
No, this seems to be an issue introduced in recent versions of Windows. When an overlapped write operation to a pipe is in progress, GetLastError() used returning ERROR_IO_PENDING while now it seems to also return NO_ERROR. This was confusing the software so that the scheduled replies were never actually output. Should be now fixed in master at cf5f2661. -- Enrico
