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
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/*
* tclUnixEvent.c --
*
* This file implements Unix specific event related routines.
*
* Copyright © 1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclInt.h"
#ifndef HAVE_COREFOUNDATION /* Darwin/Mac OS X CoreFoundation notifier is
* in tclMacOSXNotify.c */
/*
*----------------------------------------------------------------------
*
* Tcl_Sleep --
*
* Delay execution for the specified number of milliseconds.
*
* Results:
* None.
*
* Side effects:
* Time passes.
*
*----------------------------------------------------------------------
*/
void
Tcl_Sleep(
int ms) /* Number of milliseconds to sleep. */
{
struct timeval delay;
Tcl_Time before, after, vdelay;
/*
* The only trick here is that select appears to return early under some
* conditions, so we have to check to make sure that the right amount of
* time really has elapsed. If it's too early, go back to sleep again.
*/
Tcl_GetTime(&before);
after = before;
after.sec += ms/1000;
after.usec += (ms%1000)*1000;
if (after.usec > 1000000) {
after.usec -= 1000000;
after.sec += 1;
}
while (1) {
/*
* TIP #233: Scale from virtual time to real-time for select.
*/
vdelay.sec = after.sec - before.sec;
vdelay.usec = after.usec - before.usec;
if (vdelay.usec < 0) {
vdelay.usec += 1000000;
vdelay.sec -= 1;
}
if ((vdelay.sec != 0) || (vdelay.usec != 0)) {
tclScaleTimeProcPtr(&vdelay, tclTimeClientData);
}
delay.tv_sec = vdelay.sec;
delay.tv_usec = vdelay.usec;
/*
* Special note: must convert delay.tv_sec to int before comparing to
* zero, since delay.tv_usec is unsigned on some platforms.
*/
if ((((int) delay.tv_sec) < 0)
|| ((delay.tv_usec == 0) && (delay.tv_sec == 0))) {
break;
}
(void) select(0, (SELECT_MASK *) 0, (SELECT_MASK *) 0,
(SELECT_MASK *) 0, &delay);
Tcl_GetTime(&before);
}
}
#endif /* HAVE_COREFOUNDATION */
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
|
