On Sun, 18 Nov 2007 20:38:21 +0100 Helge Deller <[EMAIL PROTECTED]> wrote:
> Title: Add time-based RFC 4122 UUID generator > > The current Linux kernel currently contains the generate_random_uuid() > function, which creates - based on RFC 4122 - truly random UUIDs and > provides them to userspace through /proc/sys/kernel/random/boot_id and > /proc/sys/kernel/random/uuid. > > This patch additionally adds the "Time-based UUID" variant of RFC 4122, > with which userspace applications can easily get real unique time-based > UUIDs through /proc/sys/kernel/random/uuid_time. > A new /proc/sys/kernel/random/uuid_time_clockseq sysfs entry is available, > so that the clock_seq value can be retained across system bootups (which > is required by RFC 4122). > > The attached implementation uses getnstimeofday() to get very fine-grained > granularity. This helps, so that userspace tools can get a lot more UUIDs > (if needed) per time than before. > A mutex takes care of the proper locking against a mistaken double creation > of UUIDs for simultanious running processes. Who will use this feature, and for what? (In fact, who uses the existing UUID generators, and for what?) Thanks. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
