On Jan 12 11:47, cyg Simple wrote: > On 1/12/2017 10:00 AM, Corinna Vinschen wrote: > > On Jan 11 19:13, L. A. Walsh wrote: > >> Corinna Vinschen wrote: > >>> I know why this happens but I don't see an easy way around that. > >>> Basically the problem is that Cygwin has no control over the OS mount > >>> points (i. e., drive letter mapping and volume ireparse points). Given > >>> that, apart from C: maybe, the drive letter mapping can change any time, > >>> Cygwin doesn't cache the information but requests it every time it needs > >>> it. This includes information required in /proc/mounts, here basically > >>> the FS type. This in turn requires to open a handle to the FS, which > >>> may result in the observed hang. > >> ---- > >> Thanks for the explanation. Looking at my ".bashrc", > >> I can't figure out why needed this so I can comment it out. > >> However, as an "aside", I'm not sure why my workaround > >> didn't work...though I might guess. > >> > >> I tried using 'timeout' from 'coreutils-8.23-4' like: > >> readarray -t proc_mounts< <(timeout -k 2 1 cat /proc/mounts) > >> > >> I had hoped that w/cat hanging, timeout waits 1 second (2nd > >> number), and if no response after the #secs after -k (2) > >> then it's suppose to try to kill it. > >> > >> I'm guessing that since it's a cygwin signal, it is probably > >> waiting for Win to return to cygwin land so cygwin can > >> process the signal -- but since it's off in la la land, > >> cygwin doesn't get a chance to clean up. > > > > Exactly. The hanging call is just some NtOpenFile call on the > > filesystem. The timeout is an unfortunate effect of accessing > > a remote drive. One problem here is that Cygwin doesn't support > > interrupting of synchroneous Windows I/O calls from the signal > > handler. That's something I'm planning to do at one point, but > > don't hold your breath. > > You may be able to configure the timeout response on the device to > reduce the wait.
How so? If it requires changing the registry it's not something Cygwin can do on the fly without admin consent. Only if we can define a timeout on the application level we could use it. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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