(defun get-internal-real-time ()
#!+sb-doc
- "Return the real time in the internal time format. This is useful for
- finding elapsed time. See INTERNAL-TIME-UNITS-PER-SECOND."
+ "Return the real time in the internal time format. (See
+ INTERNAL-TIME-UNITS-PER-SECOND.) This is useful for finding elapsed time."
(multiple-value-bind (ignore seconds useconds) (sb!unix:unix-gettimeofday)
(declare (ignore ignore) (type (unsigned-byte 32) seconds useconds))
(let ((base *internal-real-time-base-seconds*)
(defun get-internal-run-time ()
#!+sb-doc
- "Return the run time in the internal time format. This is useful for
- finding CPU usage."
+ "Return the run time in the internal time format. (See
+ INTERNAL-TIME-UNITS-PER-SECOND.) This is useful for finding CPU usage."
(declare (values (unsigned-byte 32)))
(multiple-value-bind (ignore utime-sec utime-usec stime-sec stime-usec)
(sb!unix:unix-fast-getrusage sb!unix:rusage_self)
\f
;;;; Encode and decode universal times.
+;;; In August 2003, work was done in this file for more plausible
+;;; timezone handling after the unix timezone database runs out in
+;;; 2038. We assume that timezone rules are trending sane rather than
+;;; insane, so for all years after the end of time_t we apply the
+;;; rules for 2035/2036 instead of the actual date asked for. Making
+;;; the same assumption about the early 1900s would be less
+;;; reasonable, however, so please note that we're still broken for
+;;; local time between 1900-1-1 and 1901-12-13
+
+;;; It should be noted that 64 bit machines don't actually fix this
+;;; problem, at least as of 2003, because the Unix zonefiles are
+;;; specified in terms of 32 bit fields even on, say, the Alpha. So,
+;;; references to the range of time_t elsewhere in this file should
+;;; rightly be read as shorthand for the range of an signed 32 bit
+;;; number of seconds since 1970-01-01
+
+;;; I'm obliged to Erik Naggum's "Long, Painful History of Time" paper
+;;; <http://heim.ifi.uio.no/~enag/lugm-time.html> for the choice of epoch
+;;; here. By starting the year in March, we avoid having to test the month
+;;; whenever deciding whether to account for a leap day. 2000 is especially
+;;; special, because it's disvisible by 400, hence the start of a 400 year
+;;; leap year cycle
+
+;;; If a universal-time is after time_t runs out, we find its offset
+;;; from 1st March of whichever year it falls in, then add that to
+;;; 2035-3-1. This date has two relevant properties: (1) somewhere
+;;; near the end of time_t, and (2) preceding a leap year. Thus a
+;;; date which is e.g. 365.5 days from March 1st in its year will be
+;;; treated for timezone lookup as if it were Feb 29th 2036
+
+;;; This epoch is used only for fixing the timezones-outside-time_t
+;;; problem. Someday it would be nice to come back to this code and
+;;; see if the rest of the file and its references to Spice Lisp
+;;; history (Perq time base?) could be cleaned up any on this basis.
+;;; -- dan, 2003-08-08
+
+
;;; Subtract from the returned Internal-Time to get the universal
;;; time. The offset between our time base and the Perq one is 2145
;;; weeks and five days.
(daylight savings times) or NIL (standard time), and timezone."
(decode-universal-time (get-universal-time)))
+(defconstant +mar-1-2000+ #.(encode-universal-time 0 0 0 1 3 2000 0))
+(defconstant +mar-1-2035+ #.(encode-universal-time 0 0 0 1 3 2035 0))
+
+(defun years-since-mar-2000 (utime)
+ "Returns number of complete years since March 1st 2000, and remainder in seconds"
+ (let* ((days-in-year (* 86400 365))
+ (days-in-4year (+ (* 4 days-in-year) 86400))
+ (days-in-100year (- (* 25 days-in-4year) 86400))
+ (days-in-400year (+ (* 4 days-in-100year) 86400))
+ (offset (- utime +mar-1-2000+))
+ (year 0))
+ (labels ((whole-num (x y inc max)
+ (let ((w (truncate x y)))
+ (when (and max (> w max)) (setf w max))
+ (incf year (* w inc))
+ (* w y))))
+ (decf offset (whole-num offset days-in-400year 400 nil))
+ (decf offset (whole-num offset days-in-100year 100 3))
+ (decf offset (whole-num offset days-in-4year 4 25))
+ (decf offset (whole-num offset days-in-year 1 3))
+ (values year offset))))
+
+(defun truncate-to-unix-range (utime)
+ (let ((unix-time (- utime unix-to-universal-time)))
+ (if (< unix-time (ash 1 31))
+ unix-time
+ (multiple-value-bind (year offset) (years-since-mar-2000 utime)
+ (declare (ignore year))
+ (+ +mar-1-2035+ (- unix-to-universal-time) offset)))))
+
(defun decode-universal-time (universal-time &optional time-zone)
#!+sb-doc
"Converts a universal-time to decoded time format returning the following
nine values: second, minute, hour, date, month, year, day of week (0 =
Monday), T (daylight savings time) or NIL (standard time), and timezone.
Completely ignores daylight-savings-time when time-zone is supplied."
- (multiple-value-bind (weeks secs)
- (truncate (+ universal-time seconds-offset)
- seconds-in-week)
- (let* ((weeks (+ weeks weeks-offset))
- (second NIL)
- (minute NIL)
- (hour NIL)
- (date NIL)
- (month NIL)
- (year NIL)
- (day NIL)
- (daylight NIL)
- (timezone (cond
- ((null time-zone)
- (multiple-value-bind
- (ignore minwest dst)
- (sb!unix::get-timezone (- universal-time
- unix-to-universal-time))
- (declare (ignore ignore))
- (declare (fixnum minwest))
- (setf daylight dst)
- minwest))
- (t (* time-zone 60)))))
- (declare (fixnum timezone))
- (multiple-value-bind (t1 seconds) (truncate secs 60)
- (setq second seconds)
- (setq t1 (- t1 timezone))
- (let* ((tday (if (< t1 0)
- (1- (truncate (1+ t1) minutes-per-day))
- (truncate t1 minutes-per-day))))
- (multiple-value-setq (hour minute)
- (truncate (- t1 (* tday minutes-per-day)) 60))
- (let* ((t2 (1- (* (+ (* weeks 7) tday november-17-1858) 4)))
- (tcent (truncate t2 quarter-days-per-century)))
- (setq t2 (mod t2 quarter-days-per-century))
- (setq t2 (+ (- t2 (mod t2 4)) 3))
- (setq year (+ (* tcent 100) (truncate t2 quarter-days-per-year)))
- (let ((days-since-mar0 (1+ (truncate (mod t2 quarter-days-per-year)
- 4))))
- (setq day (mod (+ tday weekday-november-17-1858) 7))
- (let ((t3 (+ (* days-since-mar0 5) 456)))
- (cond ((>= t3 1989)
- (setq t3 (- t3 1836))
- (setq year (1+ year))))
- (multiple-value-setq (month t3) (truncate t3 153))
- (setq date (1+ (truncate t3 5))))))))
- (values second minute hour date month year day
- daylight
- (if daylight
- (1+ (/ timezone 60))
- (/ timezone 60))))))
+ (multiple-value-bind (daylight seconds-west)
+ (if time-zone
+ (values nil (* time-zone 60 60))
+ (multiple-value-bind (ignore seconds-west daylight)
+ (sb!unix::get-timezone (truncate-to-unix-range universal-time))
+ (declare (ignore ignore))
+ (declare (fixnum seconds-west))
+ (values daylight seconds-west)))
+ (declare (fixnum seconds-west))
+ (multiple-value-bind (weeks secs)
+ (truncate (+ (- universal-time seconds-west) seconds-offset)
+ seconds-in-week)
+ (let ((weeks (+ weeks weeks-offset)))
+ (multiple-value-bind (t1 second)
+ (truncate secs 60)
+ (let ((tday (truncate t1 minutes-per-day)))
+ (multiple-value-bind (hour minute)
+ (truncate (- t1 (* tday minutes-per-day)) 60)
+ (let* ((t2 (1- (* (+ (* weeks 7) tday november-17-1858) 4)))
+ (tcent (truncate t2 quarter-days-per-century)))
+ (setq t2 (mod t2 quarter-days-per-century))
+ (setq t2 (+ (- t2 (mod t2 4)) 3))
+ (let* ((year (+ (* tcent 100)
+ (truncate t2 quarter-days-per-year)))
+ (days-since-mar0
+ (1+ (truncate (mod t2 quarter-days-per-year) 4)))
+ (day (mod (+ tday weekday-november-17-1858) 7))
+ (t3 (+ (* days-since-mar0 5) 456)))
+ (cond ((>= t3 1989)
+ (setq t3 (- t3 1836))
+ (setq year (1+ year))))
+ (multiple-value-bind (month t3)
+ (truncate t3 153)
+ (let ((date (1+ (truncate t3 5))))
+ (values second minute hour date month year day
+ daylight
+ (if daylight
+ (1+ (/ seconds-west 60 60))
+ (/ seconds-west 60 60))))))))))))))
(defun pick-obvious-year (year)
(declare (type (mod 100) year))
(incf sum days-in-month))
(coerce (nreverse reversed-result) 'simple-vector)))
+
(defun encode-universal-time (second minute hour date month year
&optional time-zone)
#!+sb-doc
(hours (+ hour (* days 24))))
(if time-zone
(+ second (* (+ minute (* (+ hours time-zone) 60)) 60))
- (let* ((minwest-guess
- (sb!unix::unix-get-minutes-west (- (* hours 60 60)
- unix-to-universal-time)))
- (guess (+ minute (* hours 60) minwest-guess))
- (minwest
- (sb!unix::unix-get-minutes-west (- (* guess 60)
- unix-to-universal-time))))
- (+ second (* (+ guess (- minwest minwest-guess)) 60))))))
+ ;; can't ask unix for times after 2037: this is only a problem
+ ;; if we need to query the system timezone
+ (if (> year 2037)
+ (labels ((leap-year-p (year)
+ (cond ((zerop (mod year 400)) t)
+ ((zerop (mod year 100)) nil)
+ ((zerop (mod year 4)) t)
+ (t nil))))
+ (let* ((fake-year (if (leap-year-p year) 2036 2037))
+ (fake-time (encode-universal-time second minute hour
+ date month fake-year)))
+ (+ fake-time
+ (* 86400 (+ (* 365 (- year fake-year))
+ (- (leap-years-before year)
+ (leap-years-before fake-year)))))))
+ (let* ((secwest-guess
+ (sb!unix::unix-get-seconds-west
+ (- (* hours 60 60) unix-to-universal-time)))
+ (guess (+ second (* 60 (+ minute (* hours 60)))
+ secwest-guess))
+ (secwest
+ (sb!unix::unix-get-seconds-west
+ (- guess unix-to-universal-time))))
+ (+ guess (- secwest secwest-guess)))))))
\f
;;;; TIME
+(defvar *gc-run-time* 0
+ #!+sb-doc
+ "the total CPU time spent doing garbage collection (as reported by
+ GET-INTERNAL-RUN-TIME)")
+(declaim (type index *gc-run-time*))
+
(defmacro time (form)
#!+sb-doc
"Execute FORM and print timing information on *TRACE-OUTPUT*."
;;; The guts of the TIME macro. Compute overheads, run the (compiled)
;;; function, report the times.
(defun %time (fun)
+ (declare (type function fun))
(let (old-run-utime
new-run-utime
old-run-stime
(let ((gc-run-time (max (- *gc-run-time* start-gc-run-time) 0)))
(format *trace-output*
"~&Evaluation took:~% ~
- ~S second~:P of real time~% ~
- ~S second~:P of user run time~% ~
- ~S second~:P of system run time~% ~
+ ~S second~:P of real time~% ~
+ ~S second~:P of user run time~% ~
+ ~S second~:P of system run time~% ~
~@[ [Run times include ~S second~:P GC run time.]~% ~]~
- ~S page fault~:P and~% ~
- ~S bytes consed.~%"
+ ~S page fault~:P and~% ~
+ ~:D bytes consed.~%"
(max (/ (- new-real-time old-real-time)
(float sb!xc:internal-time-units-per-second))
0.0)
projects / sbcl.git / blobdiff