[SCM] GNU Mach branch, master, updated. v1.5-72-g3db15a3

[Justus Winter]

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- Log -----------------------------------------------------------------
commit 3db15a3f80f193826e144b1944727a65c13340fe
Author: Justus Winter <address@hidden>
Date:   Sat Jul 25 18:23:10 2015 +0200

    kern: add boot-time clock, use it for time stamps
    
    The kernel keeps track of task and thread creation times by saving a
    time stamp.  Previously, the real-time clock was used for this.  When
    the real-time clock is changed, however, the reference frame for the
    time stamps is lost.  This surfaced in Hurd systems reporting
    spuriously long uptimes.
    
    Fix this by creating a boot-time clock and use it as reference frame
    for the time stamps.
    
    * kern/mach_clock.c (clock_boottime_offset): Create clock by keeping
    track of the offset from the real-time.
    (clock_boottime_update): New function.
    (record_time_stamp): Use the boot-time clock for time stamps.
    (read_time_stamp): New function to convert it back to real-time.
    (host_set_time): Call `clock_boottime_update'.
    * kern/mach_clock.h (record_time_stamp): Amend comment.
    (read_time_stamp): New declaration.
    * kern/task.c (task_info): Use `read_time_stamp'.
    * kern/thread.c (thread_info): Likewise.

commit bb23879791cf015f17cb50b6443bac44b1cfbc72
Author: Justus Winter <address@hidden>
Date:   Sat Jul 25 20:04:27 2015 +0200

    include: provide time-value substraction
    
    * include/mach/time_value.h (time_value_assert): New macro to assert
    that the given value is well-formed.
    (time_value_add_usec): Use the new macro.
    (time_value_sub_usec): New macro.
    (time_value_add): Use `time_value_add_usec'.
    (time_value_sub_usec): New macro.

-----------------------------------------------------------------------

Summary of changes:
 include/mach/time_value.h |   31 ++++++++++++++++++++++++-------
 kern/mach_clock.c         |   36 +++++++++++++++++++++++++++++++++++-
 kern/mach_clock.h         |   11 ++++++++++-
 kern/task.c               |    3 ++-
 kern/thread.c             |    3 ++-
 5 files changed, 73 insertions(+), 11 deletions(-)


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