blob: abe7e6d6fdafecd7730b502d4f75d35387223322 (
plain) (
blame)
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
|
/* timer.c
*
* This file manages the interval timer on the PA-RISC.
*
* NOTE: It is important that the timer start/stop overhead be
* determined when porting or modifying this code.
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*
* $Id$
*/
/* For solaris 2.4 */
#define __EXTENSIONS__
#include <bsp.h>
#include <time.h>
#include <sys/time.h>
struct timeval Timer_start;
struct timeval Timer_stop;
struct timezone Time_zone;
rtems_boolean Timer_driver_Find_average_overhead;
void Timer_initialize()
{
gettimeofday( &Timer_start, &Time_zone );
}
#define AVG_OVERHEAD 0 /* It typically takes xxx microseconds */
/* (XX countdowns) to start/stop the timer. */
#define LEAST_VALID 10 /* Don't trust a value lower than this */
int Read_timer()
{
int total;
gettimeofday( &Timer_stop, &Time_zone );
if ( Timer_stop.tv_sec == Timer_start.tv_sec )
total = Timer_stop.tv_usec - Timer_start.tv_usec;
else {
total = 1000000 - Timer_start.tv_usec;
total += (Timer_stop.tv_sec - Timer_start.tv_sec - 1) * 1000000;
total += Timer_stop.tv_usec;
}
if ( Timer_driver_Find_average_overhead == 1 )
return total; /* in countdown units */
else {
if ( total < LEAST_VALID )
return 0; /* below timer resolution */
return total - AVG_OVERHEAD;
}
}
rtems_status_code Empty_function( void )
{
return RTEMS_SUCCESSFUL;
}
void Set_find_average_overhead(
rtems_boolean find_flag
)
{
Timer_driver_Find_average_overhead = find_flag;
}
|