sysdeps/pthread/tst-mutex4.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 <stdint.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <sys/mman.h>
  26 #include <sys/wait.h>
  27
  28
  29 static int
  30 do_test (void)
  31 {
  32   size_t ps = sysconf (_SC_PAGESIZE);
  33   char tmpfname[] = "/tmp/tst-mutex4.XXXXXX";
  34   char data[ps];
  35   void *mem;
  36   int fd;
  37   pthread_mutex_t *m;
  38   pthread_mutexattr_t a;
  39   pid_t pid;
  40   char *p;
  41   int err;
  42   int s;
  43   pthread_barrier_t *b;
  44   pthread_barrierattr_t ba;
  45
  46   fd = mkstemp (tmpfname);
  47   if (fd == -1)
  48     {
  49       printf ("cannot open temporary file: %m\n");
  50       return 1;
  51     }
  52
  53   /* Make sure it is always removed.  */
  54   unlink (tmpfname);
  55
  56   /* Create one page of data.  */
  57   memset (data, '\0', ps);
  58
  59   /* Write the data to the file.  */
  60   if (write (fd, data, ps) != (ssize_t) ps)
  61     {
  62       puts ("short write");
  63       return 1;
  64     }
  65
  66   mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  67   if (mem == MAP_FAILED)
  68     {
  69       printf ("mmap failed: %m\n");
  70       return 1;
  71     }
  72
  73   m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t) - 1)
  74                            & ~(__alignof (pthread_mutex_t) - 1));
  75   b = (pthread_barrier_t *) (((uintptr_t) (m + 1)
  76                               + __alignof (pthread_barrier_t) - 1)
  77                              & ~(__alignof (pthread_barrier_t) - 1));
  78   p = (char *) (b + 1);
  79
  80   if (pthread_mutexattr_init (&a) != 0)
  81     {
  82       puts ("mutexattr_init failed");
  83       return 1;
  84     }
  85
  86   if (pthread_mutexattr_getpshared (&a, &s) != 0)
  87     {
  88       puts ("1st mutexattr_getpshared failed");
  89       return 1;
  90     }
  91
  92   if (s != PTHREAD_PROCESS_PRIVATE)
  93     {
  94       puts ("default pshared value wrong");
  95       return 1;
  96     }
  97
  98   if (pthread_mutexattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
  99     {
 100       puts ("mutexattr_setpshared failed");
 101       return 1;
 102     }
 103
 104   if (pthread_mutexattr_getpshared (&a, &s) != 0)
 105     {
 106       puts ("2nd mutexattr_getpshared failed");
 107       return 1;
 108     }
 109
 110   if (s != PTHREAD_PROCESS_SHARED)
 111     {
 112       puts ("pshared value after setpshared call wrong");
 113       return 1;
 114     }
 115
 116 #ifdef ENABLE_PI
 117   if (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT) != 0)
 118     {
 119       puts ("pthread_mutexattr_setprotocol failed");
 120       return 1;
 121     }
 122 #endif
 123
 124   if ((err = pthread_mutex_init (m, &a)) != 0)
 125     {
 126 #ifdef ENABLE_PI
 127       if (err == ENOTSUP)
 128         {
 129           puts ("PI mutexes unsupported");
 130           return 0;
 131         }
 132 #endif
 133       puts ("mutex_init failed");
 134       return 1;
 135     }
 136
 137   if (pthread_mutex_lock (m) != 0)
 138     {
 139       puts ("mutex_lock failed");
 140       return 1;
 141     }
 142
 143   if (pthread_mutexattr_destroy (&a) != 0)
 144     {
 145       puts ("mutexattr_destroy failed");
 146       return 1;
 147     }
 148
 149   if (pthread_barrierattr_init (&ba) != 0)
 150     {
 151       puts ("barrierattr_init failed");
 152       return 1;
 153     }
 154
 155   if (pthread_barrierattr_setpshared (&ba, PTHREAD_PROCESS_SHARED) != 0)
 156     {
 157       puts ("barrierattr_setpshared failed");
 158       return 1;
 159     }
 160
 161   if (pthread_barrier_init (b, &ba, 2) != 0)
 162     {
 163       puts ("barrier_init failed");
 164       return 1;
 165     }
 166
 167   if (pthread_barrierattr_destroy (&ba) != 0)
 168     {
 169       puts ("barrierattr_destroy failed");
 170       return 1;
 171     }
 172
 173   err = pthread_mutex_trylock (m);
 174   if (err == 0)
 175     {
 176       puts ("mutex_trylock succeeded");
 177       return 1;
 178     }
 179   else if (err != EBUSY)
 180     {
 181       puts ("mutex_trylock didn't return EBUSY");
 182       return 1;
 183     }
 184
 185   *p = 0;
 186
 187   if (pthread_mutex_unlock (m) != 0)
 188     {
 189       puts ("parent: 1st mutex_unlock failed");
 190       return 1;
 191     }
 192
 193   puts ("going to fork now");
 194   pid = fork ();
 195   if (pid == -1)
 196     {
 197       puts ("fork failed");
 198       return 1;
 199     }
 200   else if (pid == 0)
 201     {
 202       if (pthread_mutex_lock (m) != 0)
 203         {
 204           puts ("child: mutex_lock failed");
 205           return 1;
 206         }
 207
 208       int e = pthread_barrier_wait (b);
 209       if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
 210         {
 211           puts ("child: barrier_wait failed");
 212           return 1;
 213         }
 214
 215       if ((*p)++ != 0)
 216         {
 217           puts ("child: *p != 0");
 218           return 1;
 219         }
 220
 221       if (pthread_mutex_unlock (m) != 0)
 222         {
 223           puts ("child: mutex_unlock failed");
 224           return 1;
 225         }
 226
 227       puts ("child done");
 228     }
 229   else
 230     {
 231       int e = pthread_barrier_wait (b);
 232       if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
 233         {
 234           puts ("parent: barrier_wait failed");
 235           return 1;
 236         }
 237
 238       if (pthread_mutex_lock (m) != 0)
 239         {
 240           puts ("parent: 2nd mutex_lock failed");
 241           return 1;
 242         }
 243
 244       if (*p != 1)
 245         {
 246           puts ("*p != 1");
 247           return 1;
 248         }
 249
 250       if (pthread_mutex_unlock (m) != 0)
 251         {
 252           puts ("parent: 2nd mutex_unlock failed");
 253           return 1;
 254         }
 255
 256       if (pthread_mutex_destroy (m) != 0)
 257         {
 258           puts ("mutex_destroy failed");
 259           return 1;
 260         }
 261
 262       if (pthread_barrier_destroy (b) != 0)
 263         {
 264           puts ("barrier_destroy failed");
 265           return 1;
 266         }
 267
 268       puts ("parent done");
 269     }
 270
 271   return 0;
 272 }
 273
 274 #define TEST_FUNCTION do_test ()
 275 #include "../test-skeleton.c"