diff options
author | Justus Winter <4winter@informatik.uni-hamburg.de> | 2015-07-25 18:23:10 +0200 |
---|---|---|
committer | Justus Winter <4winter@informatik.uni-hamburg.de> | 2015-07-25 20:12:14 +0200 |
commit | 3db15a3f80f193826e144b1944727a65c13340fe (patch) | |
tree | f6eef1e163de6a5dccdc1067300c5fce333d722b /kern/mach_clock.h | |
parent | bb23879791cf015f17cb50b6443bac44b1cfbc72 (diff) |
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.
Diffstat (limited to 'kern/mach_clock.h')
-rw-r--r-- | kern/mach_clock.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kern/mach_clock.h b/kern/mach_clock.h index 89fd335..1af0cda 100644 --- a/kern/mach_clock.h +++ b/kern/mach_clock.h @@ -86,9 +86,18 @@ extern boolean_t reset_timeout(timer_elt_t telt); extern void init_timeout (void); -/* Read the current time into STAMP. */ +/* + * Record a timestamp in STAMP. Records values in the boot-time clock + * frame. + */ extern void record_time_stamp (time_value_t *stamp); +/* + * Read a timestamp in STAMP into RESULT. Returns values in the + * real-time clock frame. + */ +extern void read_time_stamp (time_value_t *stamp, time_value_t *result); + extern kern_return_t host_get_time( host_t host, time_value_t *current_time); |