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
96
97
98
99
100
101
102
|
#include "system.h"
#ifdef __UNIX_XWIN
#include <stdio.h>
#include <sys/time.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <signal.h>
//#ifndef setitimer
//extern "C" {
//int setitimer(int Which, struct itimerval *Value,
// struct itimerval *Ovalue);
//} ;
//#endif
struct sigaction sa;
typedef void (*int_handler)();
#define SETSIG(sig,fun) (int_handler)sa.sa_handler=fun; \
sa.sa_flags=0; \
sigemptyset(&sa.sa_mask); \
sigaddset(&sa.sa_mask,SIGALRM); \
sigaction(sig,&sa,NULL);
//void timer_handler()
//{
// SETSIG(SIGALRM,timer_handler);
// printf("%ld\n",jclock++);
// fflush(stdout);
//}
void init_timer(int_handler int_proc, long utime)
{
itimerval newt;
SETSIG(SIGALRM,int_proc);
newt.it_interval.tv_sec=0;
newt.it_interval.tv_usec=utime;
newt.it_value.tv_sec=0;
newt.it_value.tv_usec=utime;
setitimer(ITIMER_REAL,&newt,NULL);
}
#else
#ifdef __BCPLUSPLUS__
#include <stdio.h>
#include <dos.h>
#include <conio.h>
#define INTR 0X1C /* The clock tick interrupt */
void interrupt ( *oldhandler)(...);
int count=0;
void interrupt handler(...)
{
/* increase the global counter */
count++;
/* call the old routine */
oldhandler();
}
int main(void)
{
/* save the old interrupt vector */
oldhandler = getvect(INTR);
/* install the new interrupt handler */
setvect(INTR, handler);
/* loop until the counter exceeds 20 */
while (count < 20)
printf("count is %d\n",count);
/* reset the old interrupt handler */
setvect(INTR, oldhandler);
return 0;
}
#else
#error Timer not supported for this compiler! Use Borland or gcc
#endif
#endif
|
