Linux does this too, but unconditionally: http://lxr.linux.no/linux+v3.1.1/include/linux/jiffies.h#L163 http://lxr.linux.no/linux+v3.1.1/include/linux/jiffies.h

Linux does this too, but unconditionally: http://lxr.linux.no/linux+v3.1.1/include/linux/jiffies.h#L163 http://lxr.linux.no/linux+v3.1.1/include/linux/jiffies.h#L16... Note that this particular timer is not directly exposed to userspace, however.