1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/* Implementation of the BSD usleep function using nanosleep.
Copyright (C) 1996-1997, 1999, 2001-2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <time.h>
#include <unistd.h>
int
usleep (useconds_t useconds)
{
unsigned int sec;
unsigned int usec;
struct timespec ts;
/* POSIX:2001 says that useconds >= 1000000 is invalid; nevertheless let's
be forgiving. */
if (__builtin_expect (useconds < 1000000, 1))
{
sec = 0;
usec = useconds;
}
else
{
sec = useconds / 1000000;
usec = useconds % 1000000;
}
ts.tv_sec = sec;
ts.tv_nsec = usec * 1000; /* Multiply as 32-bit integers. */
/* Note the usleep() is a cancellation point. But since we call
nanosleep() which itself is a cancellation point we do not have
to do anything here. */
return __nanosleep (&ts, NULL);
}
|
