[PATCH] calculate usecs correctly in thread-sleep!

[Nathaniel Alderson <alderson@gmail.com>]

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Hi,
Attached is a patch for srfi-18 thread-sleep! to work for timeoutes less
than an second in the future.
Nate

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From 6ac6565c6add2dbbd18dc6ee30fd062ba4349fd9 Mon Sep 17 00:00:00 2001
From: Nathaniel Alderson <alderson@gmail.com>
Date: Thu, 19 Sep 2013 14:02:26 -0700
Subject: [PATCH] calculate usecs correctly in thread-sleep!

---
 module/srfi/srfi-18.scm       | 4 ++--
 test-suite/tests/srfi-18.test | 8 +++++++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/module/srfi/srfi-18.scm b/module/srfi/srfi-18.scm
index 684a125..c394aef 100644
--- a/module/srfi/srfi-18.scm
+++ b/module/srfi/srfi-18.scm
@@ -236,7 +236,7 @@
 				   (list timeout) 
 				   '()))))
 	 (secs (inexact->exact (truncate t)))
-	 (usecs (inexact->exact (truncate (* (- t secs) 1000)))))
+	 (usecs (inexact->exact (truncate (* (- t secs) 1000000)))))
     (and (> secs 0) (sleep secs))
     (and (> usecs 0) (usleep usecs))
     *unspecified*))
@@ -380,4 +380,4 @@
 	 (cons (inexact->exact fx)
 	       (inexact->exact (truncate (* (- x fx) 1000000)))))))
 
-;; srfi-18.scm ends here
\ No newline at end of file
+;; srfi-18.scm ends here
diff --git a/test-suite/tests/srfi-18.test b/test-suite/tests/srfi-18.test
index 47f8f7f..ab05513 100644
--- a/test-suite/tests/srfi-18.test
+++ b/test-suite/tests/srfi-18.test
@@ -96,6 +96,12 @@
       (let ((old-secs (car (current-time))))
         (unspecified? (thread-sleep! (+ (time->seconds (current-time)))))))
 
+    (pass-if "thread sleeps fractions of a second"
+      (let* ((current (time->seconds (current-time)))
+             (future (+ current 0.5)))
+        (thread-sleep! future)
+        (>= (time->seconds (current-time)) future)))
+
     (pass-if "thread does not sleep on past time"
       (let ((past-time (seconds->time (- (time->seconds (current-time)) 2))))
         (unspecified? (thread-sleep! past-time)))))
@@ -479,4 +485,4 @@
                 (eq? (uncaught-exception-reason obj) 'foo)
                 (set! success #t)))
          (lambda () (thread-join! t)))
-        success)))))
\ No newline at end of file
+        success)))))
-- 
1.8.1.4