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/* Pausing execution of the current thread.
Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc.
Written by Bruno Haible <>, 2007.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <>. */
#include <config.h>
/* Specification. */
#include <unistd.h>
#include <limits.h>
#include "verify.h"
#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
# define WIN32_LEAN_AND_MEAN /* avoid including junk */
# include <windows.h>
unsigned int
sleep (unsigned int seconds)
unsigned int remaining;
/* Sleep for 1 second many times, because
1. Sleep is not interruptiple by Ctrl-C,
2. we want to avoid arithmetic overflow while multiplying with 1000. */
for (remaining = seconds; remaining > 0; remaining--)
Sleep (1000);
return remaining;
# undef sleep
/* Guarantee unlimited sleep and a reasonable return value. Cygwin
1.5.x rejects attempts to sleep more than 49.7 days (2**32
milliseconds), but uses uninitialized memory which results in a
garbage answer. */
unsigned int
rpl_sleep (unsigned int seconds)
/* This requires int larger than 16 bits. */
verify (UINT_MAX / 49 / 24 / 60 / 60);
const unsigned int limit = 49 * 24 * 60 * 60;
while (limit < seconds)
unsigned int result;
seconds -= limit;
result = sleep (limit);
if (result)
return seconds + result;
return sleep (seconds);
#else /* !HAVE_SLEEP */
#error "Please port gnulib sleep.c to your platform, possibly using usleep() or select(), then report this to bug-gnulib."