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
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/* This testcase is part of GDB, the GNU debugger.
Copyright 2014-2023 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 <signal.h>
#include <stdlib.h>
#include <unistd.h>
/* Used to individually advance each thread to the desired stopping point. */
int ready;
sig_atomic_t sigusr1_received;
sig_atomic_t sigusr2_received;
sig_atomic_t sigabrt_received;
/* Number of threads currently running. */
int thread_count;
pthread_mutex_t thread_count_mutex;
pthread_cond_t thread_count_condvar;
static void
incr_thread_count (void)
{
pthread_mutex_lock (&thread_count_mutex);
++thread_count;
pthread_cond_signal (&thread_count_condvar);
pthread_mutex_unlock (&thread_count_mutex);
}
static void
sigusr1_handler (int sig)
{
sigusr1_received = 1;
}
static void
sigusr2_handler (int sig)
{
sigusr2_received = 1;
}
static void
sigabrt_handler (int sig)
{
sigabrt_received = 1;
}
static void *
sigusr1_thread_function (void *unused)
{
incr_thread_count ();
while (!ready)
usleep (100);
pthread_kill (pthread_self (), SIGUSR1);
}
static void *
sigusr2_thread_function (void *unused)
{
incr_thread_count ();
while (!ready)
usleep (100);
/* pthread_kill (pthread_self (), SIGUSR2); - manually injected by gdb */
}
/* Wait until all threads are at a point where a backtrace will
show the thread entry point function. */
static void
wait_all_threads_running (int nr_threads)
{
pthread_mutex_lock (&thread_count_mutex);
while (1)
{
if (thread_count == nr_threads)
{
pthread_mutex_unlock (&thread_count_mutex);
return;
}
pthread_cond_wait (&thread_count_condvar, &thread_count_mutex);
}
}
static void
all_threads_running (void)
{
while (!ready)
usleep (100);
}
static void
all_threads_done (void)
{
}
int
main ()
{
pthread_t sigusr1_thread, sigusr2_thread;
/* Protect against running forever. */
alarm (60);
signal (SIGUSR1, sigusr1_handler);
signal (SIGUSR2, sigusr2_handler);
signal (SIGABRT, sigabrt_handler);
/* Don't let any thread advance past initialization. */
ready = 0;
pthread_mutex_init (&thread_count_mutex, NULL);
pthread_cond_init (&thread_count_condvar, NULL);
#define NR_THREADS 2
pthread_create (&sigusr1_thread, NULL, sigusr1_thread_function, NULL);
pthread_create (&sigusr2_thread, NULL, sigusr2_thread_function, NULL);
wait_all_threads_running (NR_THREADS);
all_threads_running ();
pthread_kill (pthread_self (), SIGABRT);
pthread_join (sigusr1_thread, NULL);
pthread_join (sigusr2_thread, NULL);
all_threads_done ();
return 0;
}
|
