nptl/tst-mutex9.c

   1 /* Copyright (C) 2003-2018 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <pthread.h>
  21 #include <stdint.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/mman.h>
  27 #include <sys/time.h>
  28 #include <sys/wait.h>
  29
  30
  31 static int
  32 do_test (void)
  33 {
  34   size_t ps = sysconf (_SC_PAGESIZE);
  35   char tmpfname[] = "/tmp/tst-mutex9.XXXXXX";
  36   char data[ps];
  37   void *mem;
  38   int fd;
  39   pthread_mutex_t *m;
  40   pthread_mutexattr_t a;
  41   pid_t pid;
  42
  43   fd = mkstemp (tmpfname);
  44   if (fd == -1)
  45     {
  46       printf ("cannot open temporary file: %m\n");
  47       return 1;
  48     }
  49
  50   /* Make sure it is always removed.  */
  51   unlink (tmpfname);
  52
  53   /* Create one page of data.  */
  54   memset (data, '\0', ps);
  55
  56   /* Write the data to the file.  */
  57   if (write (fd, data, ps) != (ssize_t) ps)
  58     {
  59       puts ("short write");
  60       return 1;
  61     }
  62
  63   mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  64   if (mem == MAP_FAILED)
  65     {
  66       printf ("mmap failed: %m\n");
  67       return 1;
  68     }
  69
  70   m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t))
  71                            & ~(__alignof (pthread_mutex_t) - 1));
  72
  73   if (pthread_mutexattr_init (&a) != 0)
  74     {
  75       puts ("mutexattr_init failed");
  76       return 1;
  77     }
  78
  79   if (pthread_mutexattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
  80     {
  81       puts ("mutexattr_setpshared failed");
  82       return 1;
  83     }
  84
  85   if (pthread_mutexattr_settype (&a, PTHREAD_MUTEX_RECURSIVE) != 0)
  86     {
  87       puts ("mutexattr_settype failed");
  88       return 1;
  89     }
  90
  91 #ifdef ENABLE_PI
  92   if (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT) != 0)
  93     {
  94       puts ("pthread_mutexattr_setprotocol failed");
  95       return 1;
  96     }
  97 #endif
  98
  99   int e;
 100   if ((e = pthread_mutex_init (m, &a)) != 0)
 101     {
 102 #ifdef ENABLE_PI
 103       if (e == ENOTSUP)
 104         {
 105           puts ("PI mutexes unsupported");
 106           return 0;
 107         }
 108 #endif
 109       puts ("mutex_init failed");
 110       return 1;
 111     }
 112
 113   if (pthread_mutex_lock (m) != 0)
 114     {
 115       puts ("mutex_lock failed");
 116       return 1;
 117     }
 118
 119   if (pthread_mutexattr_destroy (&a) != 0)
 120     {
 121       puts ("mutexattr_destroy failed");
 122       return 1;
 123     }
 124
 125   puts ("going to fork now");
 126   pid = fork ();
 127   if (pid == -1)
 128     {
 129       puts ("fork failed");
 130       return 1;
 131     }
 132   else if (pid == 0)
 133     {
 134       if (pthread_mutex_trylock (m) == 0)
 135         {
 136           puts ("child: mutex_trylock succeeded");
 137           exit (1);
 138         }
 139
 140       if (pthread_mutex_unlock (m) == 0)
 141         {
 142           puts ("child: mutex_unlock succeeded");
 143           exit (1);
 144         }
 145
 146       struct timeval tv;
 147       gettimeofday (&tv, NULL);
 148       struct timespec ts;
 149       TIMEVAL_TO_TIMESPEC (&tv, &ts);
 150       ts.tv_nsec += 500000000;
 151       if (ts.tv_nsec >= 1000000000)
 152         {
 153           ++ts.tv_sec;
 154           ts.tv_nsec -= 1000000000;
 155         }
 156
 157       e = pthread_mutex_timedlock (m, &ts);
 158       if (e == 0)
 159         {
 160           puts ("child: mutex_timedlock succeeded");
 161           exit (1);
 162         }
 163       if (e != ETIMEDOUT)
 164         {
 165           puts ("child: mutex_timedlock didn't time out");
 166           exit (1);
 167         }
 168
 169       alarm (1);
 170
 171       pthread_mutex_lock (m);
 172
 173       puts ("child: mutex_lock returned");
 174
 175       exit (0);
 176     }
 177
 178   sleep (2);
 179
 180   int status;
 181   if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 182     {
 183       puts ("waitpid failed");
 184       return 1;
 185     }
 186   if (! WIFSIGNALED (status))
 187     {
 188       puts ("child not killed by signal");
 189       return 1;
 190     }
 191   if (WTERMSIG (status) != SIGALRM)
 192     {
 193       puts ("child not killed by SIGALRM");
 194       return 1;
 195     }
 196
 197   return 0;
 198 }
 199
 200 #define TIMEOUT 3
 201 #define TEST_FUNCTION do_test ()
 202 #include "../test-skeleton.c"