Gtest-concurrent.c revision b0406d0a2a97b290a835ab94c13036119a0db23b 
1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2003-2005 Hewlett-Packard Co
3	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4
5Permission is hereby granted, free of charge, to any person obtaining
6a copy of this software and associated documentation files (the
7"Software"), to deal in the Software without restriction, including
8without limitation the rights to use, copy, modify, merge, publish,
9distribute, sublicense, and/or sell copies of the Software, and to
10permit persons to whom the Software is furnished to do so, subject to
11the following conditions:
12
13The above copyright notice and this permission notice shall be
14included in all copies or substantial portions of the Software.
15
16THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
23
24/*  Verify that multi-threaded concurrent unwinding works as expected.  */
25
26#ifdef HAVE_CONFIG_H
27# include "config.h"
28#endif
29
30#include <libunwind.h>
31#include <limits.h>
32#include <pthread.h>
33#include <signal.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <unistd.h>
37
38#define NTHREADS	128
39
40#define panic(args...)						\
41	do { fprintf (stderr, args); ++nerrors; } while (0)
42
43int verbose;
44int nerrors;
45int got_usr1, got_usr2;
46char *sigusr1_sp;
47
48void
49handler (int sig)
50{
51  unw_word_t ip;
52  unw_context_t uc;
53  unw_cursor_t c;
54  int ret;
55
56  unw_getcontext (&uc);
57  unw_init_local (&c, &uc);
58  do
59    {
60      unw_get_reg (&c, UNW_REG_IP, &ip);
61      if (verbose)
62	printf ("%lx: IP=%lx\n", (long) pthread_self (), (unsigned long) ip);
63    }
64  while ((ret = unw_step (&c)) > 0);
65
66  if (ret < 0)
67    panic ("unw_step() returned %d\n", ret);
68}
69
70void *
71worker (void *arg)
72{
73  signal (SIGUSR1, handler);
74
75  if (verbose)
76    printf ("sending SIGUSR1\n");
77  pthread_kill (pthread_self (), SIGUSR1);
78  return NULL;
79}
80
81static void
82doit (void)
83{
84  pthread_t th[NTHREADS];
85  pthread_attr_t attr;
86  int i;
87
88  pthread_attr_init (&attr);
89  pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN + 64*1024);
90
91  for (i = 0; i < NTHREADS; ++i)
92    if (pthread_create (th + i, &attr, worker, NULL))
93      {
94	fprintf (stderr, "FAILURE: Failed to create %u threads "
95		 "(after %u threads)\n",
96		 NTHREADS, i);
97	exit (-1);
98      }
99
100  for (i = 0; i < NTHREADS; ++i)
101    pthread_join (th[i], NULL);
102}
103
104int
105main (int argc, char **argv)
106{
107  if (argc > 1)
108    verbose = 1;
109
110  if (verbose)
111    printf ("Caching: none\n");
112  unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_NONE);
113  doit ();
114
115  if (verbose)
116    printf ("Caching: global\n");
117  unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_GLOBAL);
118
119  if (verbose)
120    printf ("Caching: per-thread\n");
121  unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_PER_THREAD);
122
123  if (nerrors)
124    {
125      fprintf (stderr, "FAILURE: detected %d errors\n", nerrors);
126      exit (-1);
127    }
128
129  if (verbose)
130    printf ("SUCCESS\n");
131  return 0;
132}
133