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. Beyond that we are at the mercy of Windows. -- cyg Simple -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
