Zdenek, thank you for the clarification. Alex. On Mon, Aug 1, 2011 at 2:05 PM, Zdenek Kabelac <zdenek.kabelac@gmail.com> wrote: > Dne 1.8.2011 10:12, Alexander Lyakas napsal(a): >> Hello everybody, >> I am using stock ubuntu natty with lvmlib 2.02.66. >> >> In my application I would like to have several threads, each operating >> on a different VG. >> >> When I tried to share the same lvm_t handle between the threads, very >> soon I got segmentation faults in dm_hash operations. Looking at the >> code, I indeed saw that the contents of lvm_t are used without >> synchronization. > > > lvm library is not thread safe and it's quite far from being thread safe. > > So there is no point on having 2 handles on 2 VGs - it will not work. > >> >> Are there any plans or intentions to provide some support for >> threading with lvmlib? >> > > With current version of lvm2 code there is no way. > > Just use the pthread mutex around the lvm command. It's serialized in kernel > anyway. So you cannot gain any speed by using threads. (Check the clvmd code.) > > > Zdenek > > > _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
