/* Pausing execution of the current thread.

   Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.

   Written by Bruno Haible <bruno@clisp.org>, 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

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   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 <https://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */

#include <unistd.h>

#include <limits.h>

#include "verify.h"

#if 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 interruptible by Ctrl-C,

       2. we want to avoid arithmetic overflow while multiplying with 1000.  */

  for (remaining = seconds; remaining > 0; remaining--)

    Sleep (1000);

  return remaining;

}

#elif HAVE_SLEEP

# 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.  Similarly, Linux 2.6.9 with glibc 2.3.4 has a too

   small return value when asked to sleep more than 24.85 days.  */

unsigned int

rpl_sleep (unsigned int seconds)

{

  /* This requires int larger than 16 bits.  */

  verify (UINT_MAX / 24 / 24 / 60 / 60);

  const unsigned int limit = 24 * 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."

#endif