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
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/*
* Copyright (c) 2014 Daniel Ramirez. (javamonn@gmail.com)
*
* This file's license is 2-clause BSD as in this distribution's LICENSE file.
*/
#include <timesys.h>
#include <rtems/btimer.h>
#define BENCHMARKS 50000
const char rtems_test_name[] = "RHTASKSWITCH";
rtems_task Task01( rtems_task_argument ignored );
rtems_task Task02( rtems_task_argument ignored );
rtems_task Init( rtems_task_argument ignored );
rtems_id Task_id[2];
rtems_name Task_name[2];
uint32_t loop_overhead;
uint32_t dir_overhead;
unsigned long count1, count2;
rtems_status_code status;
rtems_task Task02( rtems_task_argument ignored )
{
uint32_t telapsed;
/* All overhead accounted for now, we can begin benchmark */
benchmark_timer_initialize();
for ( count1 = 0; count1 < BENCHMARKS - 1; count1++ ) {
rtems_task_wake_after( RTEMS_YIELD_PROCESSOR );
}
telapsed = benchmark_timer_read();
put_time(
"Rhealstone: Task switch",
telapsed,
( BENCHMARKS * 2 ) - 1, /* ( BENCHMARKS * 2 ) - 1 total benchmarks */
loop_overhead, /* Overhead of loop */
dir_overhead /* Overhead of rtems_task_wake_after directive */
);
TEST_END();
rtems_test_exit( 0 );
}
rtems_task Task01( rtems_task_argument ignored )
{
status = rtems_task_start( Task_id[1], Task02, 0 );
directive_failed( status, "rtems_task_start of TA02" );
/* Yield processor so second task can startup and run */
rtems_task_wake_after( RTEMS_YIELD_PROCESSOR );
for ( count2 = 0; count2 < BENCHMARKS; count2++ ) {
rtems_task_wake_after( RTEMS_YIELD_PROCESSOR );
}
/* Should never reach here */
rtems_test_assert( false );
}
rtems_task Init( rtems_task_argument ignored )
{
Print_Warning();
TEST_BEGIN();
Task_name[0] = rtems_build_name( 'T','A','0','1' );
status = rtems_task_create(
Task_name[0],
30,
RTEMS_MINIMUM_STACK_SIZE,
RTEMS_DEFAULT_MODES,
RTEMS_DEFAULT_ATTRIBUTES,
&Task_id[0]
);
directive_failed( status, "rtems_task_create of TA01" );
Task_name[1] = rtems_build_name( 'T','A','0','2' );
status = rtems_task_create(
Task_name[1],
30,
RTEMS_MINIMUM_STACK_SIZE,
RTEMS_DEFAULT_MODES,
RTEMS_DEFAULT_ATTRIBUTES,
&Task_id[1]
);
directive_failed( status, "rtems_task_create of TA02" );
/* find overhead of routine (no task switches) */
benchmark_timer_initialize();
for ( count1 = 0; count1 < BENCHMARKS - 1; count1++ ) {
/* rtems_task_wake_after( RTEMS_YIELD_PROCESSOR ) */
}
for ( count2 = 0; count2 < BENCHMARKS; count2++ ) {
/* rtems_task_wake_after( RTEMS_YIELD_PROCESSOR ) */
}
loop_overhead = benchmark_timer_read();
/* find overhead of rtems_task_wake_after call (no task switches) */
benchmark_timer_initialize();
rtems_task_wake_after( RTEMS_YIELD_PROCESSOR );
dir_overhead = benchmark_timer_read();
status = rtems_task_start( Task_id[0], Task01, 0);
directive_failed( status, "rtems_task_start of TA01" );
status = rtems_task_delete( RTEMS_SELF);
directive_failed( status, "rtems_task_delete of INIT" );
}
/* configuration information */
#define CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER
#define CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER
#define CONFIGURE_TICKS_PER_TIMESLICE 0
#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
#define CONFIGURE_MAXIMUM_TASKS 3
#define CONFIGURE_INIT
#include <rtems/confdefs.h>
|
