nptl/tst-signal3.c

   1 /* Copyright (C) 2002-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <pthread.h>
  20 #include <semaphore.h>
  21 #include <signal.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26
  27 #ifdef SIGRTMIN
  28
  29 /* Number of different signals to use.  Also is the number of threads.  */
  30 # define N 10
  31 /* Maximum number of threads in flight at any one time.  */
  32 # define INFLIGHT 5
  33 /* Number of signals sent in total.  */
  34 # define ROUNDS 10000
  35
  36
  37 static int received[N][N];
  38 static int nsig[N];
  39 static pthread_t th[N];
  40 static sem_t sem;
  41 static pthread_mutex_t lock[N];
  42 static pthread_t th_main;
  43 static int sig0;
  44
  45 static void
  46 handler (int sig)
  47 {
  48   int i;
  49   for (i = 0; i < N; ++i)
  50     if (pthread_equal (pthread_self (), th[i]))
  51       break;
  52
  53   if (i == N)
  54     {
  55       if (pthread_equal (pthread_self (), th_main))
  56         puts ("signal received by main thread");
  57       else
  58         printf ("signal received by unknown thread (%lx)\n",
  59                 (unsigned long int) pthread_self ());
  60       exit (1);
  61     }
  62
  63   ++received[i][sig - sig0];
  64
  65   sem_post (&sem);
  66 }
  67
  68
  69 static void *
  70 tf (void *arg)
  71 {
  72   int idx = (long int) arg;
  73
  74   sigset_t ss;
  75   sigemptyset (&ss);
  76
  77   int i;
  78   for (i = 0; i <= idx; ++i)
  79     sigaddset (&ss, sig0 + i);
  80
  81   if (pthread_sigmask (SIG_UNBLOCK, &ss, NULL) != 0)
  82     {
  83       printf ("thread %d: pthread_sigmask failed\n", i);
  84       exit (1);
  85     }
  86
  87   pthread_mutex_lock (&lock[idx]);
  88
  89   return NULL;
  90 }
  91
  92
  93 static int
  94 do_test (void)
  95 {
  96   /* Block all signals.  */
  97   sigset_t ss;
  98   sigfillset (&ss);
  99
 100   th_main = pthread_self ();
 101
 102   sig0 = SIGRTMIN;
 103
 104   if (pthread_sigmask (SIG_SETMASK, &ss, NULL) != 0)
 105     {
 106       puts ("1st pthread_sigmask failed");
 107       exit (1);
 108     }
 109
 110   /* Install the handler.  */
 111   int i;
 112   for (i = 0; i < N; ++i)
 113     {
 114       struct sigaction sa =
 115         {
 116           .sa_handler = handler,
 117           .sa_flags = 0
 118         };
 119       sigfillset (&sa.sa_mask);
 120
 121       if (sigaction (sig0 + i, &sa, NULL) != 0)
 122         {
 123           printf ("sigaction for signal %d failed\n", i);
 124           exit (1);
 125         }
 126     }
 127
 128   if (sem_init (&sem, 0, INFLIGHT) != 0)
 129     {
 130       puts ("sem_init failed");
 131       exit (1);
 132     }
 133
 134   pthread_attr_t a;
 135
 136   if (pthread_attr_init (&a) != 0)
 137     {
 138       puts ("attr_init failed");
 139       exit (1);
 140     }
 141
 142   if (pthread_attr_setstacksize (&a, 1 * 1024 * 1024) != 0)
 143     {
 144       puts ("attr_setstacksize failed");
 145       return 1;
 146     }
 147
 148   for (i = 0; i < N; ++i)
 149     {
 150       if (pthread_mutex_init (&lock[i], NULL) != 0)
 151         {
 152           printf ("mutex_init[%d] failed\n", i);
 153         }
 154
 155       if (pthread_mutex_lock (&lock[i]) != 0)
 156         {
 157           printf ("mutex_lock[%d] failed\n", i);
 158         }
 159
 160       if (pthread_create (&th[i], &a, tf, (void *) (long int) i) != 0)
 161         {
 162           printf ("create of thread %d failed\n", i);
 163           exit (1);
 164         }
 165     }
 166
 167   if (pthread_attr_destroy (&a) != 0)
 168     {
 169       puts ("attr_destroy failed");
 170       exit (1);
 171     }
 172
 173   int result = 0;
 174   unsigned int r = 42;
 175   pid_t pid = getpid ();
 176
 177   for (i = 0; i < ROUNDS; ++i)
 178     {
 179       if (TEMP_FAILURE_RETRY (sem_wait (&sem)) != 0)
 180         {
 181           printf ("sem_wait round %d failed: %m\n", i);
 182           exit (1);
 183         }
 184
 185       int s = rand_r (&r) % N;
 186
 187       kill (pid, sig0 + s);
 188     }
 189
 190   void *status;
 191   for (i = 0; i < N; ++i)
 192     {
 193       if (pthread_mutex_unlock (&lock[i]) != 0)
 194         {
 195           printf ("unlock %d failed\n", i);
 196           exit (1);
 197         }
 198
 199       if (pthread_join (th[i], &status) != 0)
 200         {
 201           printf ("join %d failed\n", i);
 202           result = 1;
 203         }
 204       else if (status != NULL)
 205         {
 206           printf ("%d: result != NULL\n", i);
 207           result = 1;
 208         }
 209     }
 210
 211   int total = 0;
 212   for (i = 0; i < N; ++i)
 213     {
 214       int j;
 215
 216       for (j = 0; j <= i; ++j)
 217         total += received[i][j];
 218
 219       for (j = i + 1; j < N; ++j)
 220         if (received[i][j] != 0)
 221           {
 222             printf ("thread %d received signal SIGRTMIN+%d\n", i, j);
 223             result = 1;
 224           }
 225     }
 226
 227   if (total != ROUNDS)
 228     {
 229       printf ("total number of handled signals is %d, expected %d\n",
 230               total, ROUNDS);
 231       result = 1;
 232     }
 233
 234   printf ("A total of %d signals sent and received\n", total);
 235   for (i = 0; i < N; ++i)
 236     {
 237       printf ("thread %2d:", i);
 238
 239       int j;
 240       for (j = 0; j <= i; ++j)
 241         {
 242           printf (" %5d", received[i][j]);
 243           nsig[j] += received[i][j];
 244         }
 245
 246       putchar ('\n');
 247
 248     }
 249
 250   printf ("\nTotal    :");
 251   for (i = 0; i < N; ++i)
 252     printf (" %5d", nsig[i]);
 253   putchar ('\n');
 254
 255   return result;
 256 }
 257
 258 # define TEST_FUNCTION do_test ()
 259
 260 #else
 261 # define TEST_FUNCTION 0
 262 #endif
 263
 264 #include "../test-skeleton.c"