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
124
125
126
127
|
/* $OpenBSD: switch.c,v 1.5 2003/12/23 20:09:42 miod Exp $ */
/*
* Copyright (c) 1993, 1994, 1995, 1996 by Chris Provenzano and contributors,
* proven@mit.edu All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Chris Provenzano,
* the University of California, Berkeley, and contributors.
* 4. Neither the name of Chris Provenzano, the University, nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO, THE REGENTS OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* ==== test_switch.c ========================================================
* Copyright (c) 1993 by Chris Provenzano, proven@athena.mit.edu
*
* Description : Test context switch functionality.
*
* 1.00 93/08/04 proven
* -Started coding this file.
*/
#include <pthread.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include "test.h"
const char buf[] = "abcdefghijklmnopqrstuvwxyz";
char x[sizeof(buf)];
int fd = 1;
volatile int ending = 0;
/* ==========================================================================
* usage();
*/
static void
usage(void)
{
extern char *__progname;
printf("usage: %s [-?] [-c count]\n", __progname);
printf("count must be between 2 and 26\n");
errno = 0;
}
static void *
new_thread(void *arg)
{
int i;
SET_NAME("writer");
while (!ending) {
CHECKe(write (fd, (char *) arg, 1));
x[(char *)arg - buf] = 1;
for (i = 0; i < 999999; i += 1)
;
}
return NULL;
}
int
main(int argc, char *argv[])
{
pthread_t thread;
int ch, count = 4;
long i;
/* Getopt variables. */
extern int optind, opterr;
extern char *optarg;
while ((ch = getopt(argc, argv, "c:?")) != -1)
switch (ch)
{
case 'c':
count = atoi(optarg);
if ((count > 26) || (count < 2)) {
count = 2;
}
break;
case '?':
usage();
return(OK);
default:
usage();
return(NOTOK);
}
/* create the threads */
for (i = 0; i < count; i++)
CHECKr(pthread_create(&thread, NULL, new_thread,
(void*)(buf+i)));
/* give all threads a chance to run */
sleep (2);
ending = 1;
for (i = 0; i < count; i++)
ASSERT(x[i]); /* make sure each thread ran */
CHECKe(write(STDOUT_FILENO, "\n", 1));
SUCCEED;
}
|
