(Sorry, I'm always forgetting to use "Reply to list" :-( ) On Fri, 17 Jan 2003 16:07:28 +0100 Henning Meier-Geinitz <henn...@meier-geinitz.de> wrote:
> Hi, > > On Fri, Jan 17, 2003 at 05:35:22PM +0300, Sergey Vlasov wrote: > > On Fri, 17 Jan 2003 11:27:12 +0100 > > Henning Meier-Geinitz <henn...@meier-geinitz.de> wrote: > > > > > > Does SANE support multiple scanner types at the same time? > > > > > > Yes. Basically, the number of scanners is unlimited. I've succeeded in > > > scanning from 3 USB and 3 SCSI scanners at the same time :-) > > > > Hmm. Looking at the Linux USB scanner kernel driver, I suspect that > > the device scan would be blocked in open() when it hits an used > > device. > > I dond't think so. The locks are only active during the call to > open_scanner(), not while the device is open. Scanning an already > opened device will run into the "if (scn->isopen)" test and exit. > At least that's the case in recent kernels. > > The following example with three scanners works here: > > $ scanimage -L > device gt68xx:/dev/usb/scanner2' is a Plustek OpticPro 1248U flatbed scanner > device gt68xx:/dev/usb/scanner1' is a Mustek BearPaw 2400 CU Plus flatbed > scanner > device gt68xx:/dev/usb/scanner0' is a Mustek ScanExpress 1200 UB Plus flatbed > scanner > > $ scanimage -d gt68xx:/dev/usb/scanner0 >/tmp/image0.pnm & \ > scanimage -d gt68xx:/dev/usb/scanner1 >/tmp/image1.pnm & \ > scanimage -d gt68xx:/dev/usb/scanner2 >/tmp/image2.pnm But what if you do 'scanimage -L' while some scanning is in progress?
