Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / ice-9 / time.scm

diff --git a/guile18/ice-9/time.scm b/guile18/ice-9/time.scm
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+;;;;   Copyright (C) 2001, 2004, 2006 Free Software Foundation, Inc.
+;;;;
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 2.1 of the License, or (at your option) any later version.
+;;;; 
+;;;; This library is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;;; Lesser General Public License for more details.
+;;;; 
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+;;;;
+\f
+;;; Commentary:
+
+;; This module exports a single macro: `time'.
+;; Usage: (time exp)
+;;
+;; Example:
+;; guile> (time (sleep 3))
+;; clock utime stime cutime cstime gctime
+;; 3.01  0.00  0.00   0.00   0.00   0.00
+;; 0
+
+;;; Code:
+
+(define-module (ice-9 time)
+  :use-module (ice-9 format)
+  :export (time))
+
+(define (time-proc proc)
+  (let* ((gc-start (gc-run-time))
+         (tms-start (times))
+         (result (proc))
+         (tms-end (times))
+         (gc-end (gc-run-time)))
+    ;; FIXME: We would probably like format ~f to accept rationals, but
+    ;; currently it doesn't so we force to a flonum with exact->inexact.
+    (define (get proc start end)
+      (exact->inexact (/ (- (proc end) (proc start)) internal-time-units-per-second)))
+    (display "clock utime stime cutime cstime gctime\n")
+    (format #t "~5,2F ~5,2F ~5,2F ~6,2F ~6,2F ~6,2F\n"
+            (get tms:clock tms-start tms-end)
+            (get tms:utime tms-start tms-end)
+            (get tms:stime tms-start tms-end)
+            (get tms:cutime tms-start tms-end)
+            (get tms:cstime tms-start tms-end)
+            (get identity gc-start gc-end))
+    result))
+
+(define-macro (time exp)
+  `(,time-proc (lambda () ,exp)))
+
+;;; time.scm ends here