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434
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1 /* Pausing execution of the current thread.
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2 Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc.
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3 Written by Bruno Haible <bruno@clisp.org>, 2007.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 #include <config.h>
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19
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20 /* Specification. */
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21 #include <unistd.h>
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22
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23 #include <limits.h>
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24
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25 #include "verify.h"
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26
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27 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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28
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29 # define WIN32_LEAN_AND_MEAN /* avoid including junk */
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30 # include <windows.h>
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31
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32 unsigned int
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33 sleep (unsigned int seconds)
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34 {
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35 unsigned int remaining;
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36
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37 /* Sleep for 1 second many times, because
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38 1. Sleep is not interruptiple by Ctrl-C,
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39 2. we want to avoid arithmetic overflow while multiplying with 1000. */
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40 for (remaining = seconds; remaining > 0; remaining--)
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41 Sleep (1000);
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42
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43 return remaining;
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44 }
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45
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46 #elif HAVE_SLEEP
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47
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48 # undef sleep
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49
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50 /* Guarantee unlimited sleep and a reasonable return value. Cygwin
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51 1.5.x rejects attempts to sleep more than 49.7 days (2**32
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52 milliseconds), but uses uninitialized memory which results in a
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53 garbage answer. */
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54 unsigned int
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55 rpl_sleep (unsigned int seconds)
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56 {
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57 /* This requires int larger than 16 bits. */
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58 verify (UINT_MAX / 49 / 24 / 60 / 60);
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59 const unsigned int limit = 49 * 24 * 60 * 60;
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60 while (limit < seconds)
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61 {
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62 unsigned int result;
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63 seconds -= limit;
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64 result = sleep (limit);
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65 if (result)
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66 return seconds + result;
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67 }
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68 return sleep (seconds);
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69 }
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70
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71 #else /* !HAVE_SLEEP */
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72
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73 #error "Please port gnulib sleep.c to your platform, possibly using usleep() or select(), then report this to bug-gnulib."
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74
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75 #endif
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