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77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* Pausing execution of the current thread.
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Copyright (C) 2007, 2009-2013 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2007.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <unistd.h>
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#include <limits.h>
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#include "verify.h"
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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# define WIN32_LEAN_AND_MEAN /* avoid including junk */
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# include <windows.h>
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unsigned int
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sleep (unsigned int seconds)
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{
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unsigned int remaining;
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/* Sleep for 1 second many times, because
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1. Sleep is not interruptible by Ctrl-C,
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2. we want to avoid arithmetic overflow while multiplying with 1000. */
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for (remaining = seconds; remaining > 0; remaining--)
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Sleep (1000);
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return remaining;
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}
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#elif HAVE_SLEEP
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# undef sleep
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/* Guarantee unlimited sleep and a reasonable return value. Cygwin
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1.5.x rejects attempts to sleep more than 49.7 days (2**32
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milliseconds), but uses uninitialized memory which results in a
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garbage answer. Similarly, Linux 2.6.9 with glibc 2.3.4 has a too
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small return value when asked to sleep more than 24.85 days. */
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unsigned int
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rpl_sleep (unsigned int seconds)
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{
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/* This requires int larger than 16 bits. */
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verify (UINT_MAX / 24 / 24 / 60 / 60);
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const unsigned int limit = 24 * 24 * 60 * 60;
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while (limit < seconds)
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{
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unsigned int result;
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seconds -= limit;
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result = sleep (limit);
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if (result)
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return seconds + result;
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}
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return sleep (seconds);
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}
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#else /* !HAVE_SLEEP */
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#error "Please port gnulib sleep.c to your platform, possibly using usleep() or select(), then report this to bug-gnulib."
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#endif
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