xapian-core  1.4.19
safeunistd.h
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1 
4 /* Copyright (C) 2007,2015 Olly Betts
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License as
8  * published by the Free Software Foundation; either version 2 of the
9  * License, or (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
19  * USA
20  */
21 
22 #ifndef XAPIAN_INCLUDED_SAFEUNISTD_H
23 #define XAPIAN_INCLUDED_SAFEUNISTD_H
24 
25 #ifndef PACKAGE
26 # error config.h must be included first in each C++ source file
27 #endif
28 
29 #ifndef _MSC_VER
30 # include <unistd.h>
31 #else
32 
33 // io.h is the nearest equivalent to unistd.h.
34 # include <io.h>
35 
36 // process.h is needed for getpid().
37 # include <process.h>
38 
39 // direct.h is needed for rmdir().
40 # include <direct.h>
41 
42 #endif
43 
44 // Under mingw we probably don't need to provide our own sleep().
45 #if defined __WIN32__ && !defined HAVE_SLEEP
46 
47 inline unsigned int
48 sleep(unsigned int seconds)
49 {
50  // Use our own little helper function to avoid pulling in <windows.h>.
51  extern void xapian_sleep_milliseconds(unsigned int millisecs);
52 
53  // Sleep takes a time interval in milliseconds, whereas POSIX sleep takes
54  // a time interval in seconds, so we need to multiply 'seconds' by 1000.
55  //
56  // But make sure the multiplication won't overflow! 4294967 seconds is
57  // nearly 50 days, so just sleep for that long and return the number of
58  // seconds left to sleep for. The common case of sleep(CONSTANT) should
59  // optimise to just xapian_sleep_milliseconds(CONSTANT).
60  if (seconds > 4294967u) {
61  xapian_sleep_milliseconds(4294967000u);
62  return seconds - 4294967u;
63  }
64  xapian_sleep_milliseconds(seconds * 1000u);
65  return 0;
66 }
67 
68 #endif
69 
70 #endif /* XAPIAN_INCLUDED_SAFEUNISTD_H */
void sleep(double t)
Sleep until the time represented by this object.
Definition: realtime.h:127