[PATCH] Allow giving floating point values to (sleep).

[arne.babenhauserheide]

# HG changeset patch
# User Arne Babenhauserheide <address@hidden>
# Date 1463764424 -7200
#      Fri May 20 19:13:44 2016 +0200
# Node ID 8c8510a889e2d3b9f57f5b3057f5ed0e001ab799
# Parent  0d961f25dfa2a5e421e3bd9d816740a736647cbc
initial inelegant implementation of (sleep) which takes floats

diff -r 0d961f25dfa2 -r 8c8510a889e2 libguile/scmsigs.c
--- a/libguile/scmsigs.c        Wed May 18 22:18:51 2016 +0200
+++ b/libguile/scmsigs.c        Fri May 20 19:13:44 2016 +0200
@@ -625,14 +625,25 @@
 
 SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0,
            (SCM i),
-           "Wait for the given number of seconds (an integer) or until a 
signal\n"
-           "arrives.  The return value is zero if the time elapses or the 
number\n"
-           "of seconds remaining otherwise.\n"
+           "Wait for the given number of seconds (an integer or float)\n"
+           "or until a signal arrives.  The return value is zero if the time\n"
+           "elapses or the number of seconds remaining otherwise.\n"
            "\n"
            "See also @code{usleep}.")
 #define FUNC_NAME s_scm_sleep
 {
-  return scm_from_uint (scm_std_sleep (scm_to_uint (i)));
+  SCM one, million, i_sleep, i_usleep, res_sleep, res_usleep;
+  if (SCM_LIKELY (scm_is_integer (i)))
+    return scm_from_uint (scm_std_sleep (scm_to_uint (i)));
+  one = scm_from_int (1);
+  million = scm_from_int (1000000);
+  /* Time to wait in sleep */
+  i_sleep = scm_inexact_to_exact (scm_floor_quotient (i, one));
+  /* Time to wait in usleep */
+  i_usleep = scm_inexact_to_exact (scm_floor_quotient (scm_product (million, 
scm_floor_remainder (i, one)), one));
+  res_sleep = scm_from_uint (scm_std_sleep (scm_to_uint (i_sleep)));
+  res_usleep = scm_from_ulong (scm_std_usleep (scm_to_ulong (i_usleep)));
+  return scm_sum(res_sleep, res_usleep);
 }
 #undef FUNC_NAME