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
|
/* This testcase is part of GDB, the GNU debugger.
Copyright 2009-2017 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
static const char *image;
static pthread_barrier_t barrier;
static char *argv1 = "go away";
static void *
thread_execler (void *arg)
{
int i;
pthread_barrier_wait (&barrier);
/* Exec ourselves again. */
if (execl (image, image, argv1, NULL) == -1) /* break-here */
{
perror ("execl");
abort ();
}
return NULL;
}
static void *
just_loop (void *arg)
{
unsigned int i;
pthread_barrier_wait (&barrier);
for (i = 1; i > 0; i++)
usleep (1);
return NULL;
}
#define THREADS 5
pthread_t loop_thread[THREADS];
int
main (int argc, char **argv)
{
pthread_t thread;
int i, t;
image = argv[0];
/* Pass "inf" as argument to keep re-execing ad infinitum, which can
be useful for manual testing. Passing any other argument exits
immediately (and that's what the execl above does by
default). */
if (argc == 2 && strcmp (argv[1], "inf") == 0)
argv1 = argv[1];
else if (argc > 1)
exit (0);
pthread_barrier_init (&barrier, NULL, 2 + THREADS);
i = pthread_create (&thread, NULL, thread_execler, NULL);
assert (i == 0);
for (t = 0; t < THREADS; t++)
{
i = pthread_create (&loop_thread[t], NULL, just_loop, NULL);
assert (i == 0);
}
pthread_barrier_wait (&barrier);
pthread_join (thread, NULL);
return 0;
}
|
