nptl/tst-mutex9.c

   1 /* Copyright (C) 2003, 2004, 2006, 2011 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <pthread.h>
  22 #include <stdio.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-mutex9.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
  41   fd = mkstemp (tmpfname);
  42   if (fd == -1)
  43     {
  44       printf ("cannot open temporary file: %m\n");
  45       return 1;
  46     }
  47
  48   /* Make sure it is always removed.  */
  49   unlink (tmpfname);
  50
  51   /* Create one page of data.  */
  52   memset (data, '\0', ps);
  53
  54   /* Write the data to the file.  */
  55   if (write (fd, data, ps) != (ssize_t) ps)
  56     {
  57       puts ("short write");
  58       return 1;
  59     }
  60
  61   mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  62   if (mem == MAP_FAILED)
  63     {
  64       printf ("mmap failed: %m\n");
  65       return 1;
  66     }
  67
  68   m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t))
  69                            & ~(__alignof (pthread_mutex_t) - 1));
  70
  71   if (pthread_mutexattr_init (&a) != 0)
  72     {
  73       puts ("mutexattr_init failed");
  74       return 1;
  75     }
  76
  77   if (pthread_mutexattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
  78     {
  79       puts ("mutexattr_setpshared failed");
  80       return 1;
  81     }
  82
  83   if (pthread_mutexattr_settype (&a, PTHREAD_MUTEX_RECURSIVE) != 0)
  84     {
  85       puts ("mutexattr_settype failed");
  86       return 1;
  87     }
  88
  89 #ifdef ENABLE_PI
  90   if (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT) != 0)
  91     {
  92       puts ("pthread_mutexattr_setprotocol failed");
  93       return 1;
  94     }
  95 #endif
  96
  97   int e;
  98   if ((e = pthread_mutex_init (m, &a)) != 0)
  99     {
 100 #ifdef ENABLE_PI
 101       if (e == ENOTSUP)
 102         {
 103           puts ("PI mutexes unsupported");
 104           return 0;
 105         }
 106 #endif
 107       puts ("mutex_init failed");
 108       return 1;
 109     }
 110
 111   if (pthread_mutex_lock (m) != 0)
 112     {
 113       puts ("mutex_lock failed");
 114       return 1;
 115     }
 116
 117   if (pthread_mutexattr_destroy (&a) != 0)
 118     {
 119       puts ("mutexattr_destroy failed");
 120       return 1;
 121     }
 122
 123   puts ("going to fork now");
 124   pid = fork ();
 125   if (pid == -1)
 126     {
 127       puts ("fork failed");
 128       return 1;
 129     }
 130   else if (pid == 0)
 131     {
 132       if (pthread_mutex_trylock (m) == 0)
 133         {
 134           puts ("child: mutex_trylock succeeded");
 135           exit (1);
 136         }
 137
 138       if (pthread_mutex_unlock (m) == 0)
 139         {
 140           puts ("child: mutex_unlock succeeded");
 141           exit (1);
 142         }
 143
 144       struct timeval tv;
 145       gettimeofday (&tv, NULL);
 146       struct timespec ts;
 147       TIMEVAL_TO_TIMESPEC (&tv, &ts);
 148       ts.tv_nsec += 500000000;
 149       if (ts.tv_nsec >= 1000000000)
 150         {
 151           ++ts.tv_sec;
 152           ts.tv_nsec -= 1000000000;
 153         }
 154
 155       e = pthread_mutex_timedlock (m, &ts);
 156       if (e == 0)
 157         {
 158           puts ("child: mutex_timedlock succeeded");
 159           exit (1);
 160         }
 161       if (e != ETIMEDOUT)
 162         {
 163           puts ("child: mutex_timedlock didn't time out");
 164           exit (1);
 165         }
 166
 167       alarm (1);
 168
 169       pthread_mutex_lock (m);
 170
 171       puts ("child: mutex_lock returned");
 172
 173       exit (0);
 174     }
 175
 176   sleep (2);
 177
 178   int status;
 179   if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 180     {
 181       puts ("waitpid failed");
 182       return 1;
 183     }
 184   if (! WIFSIGNALED (status))
 185     {
 186       puts ("child not killed by signal");
 187       return 1;
 188     }
 189   if (WTERMSIG (status) != SIGALRM)
 190     {
 191       puts ("child not killed by SIGALRM");
 192       return 1;
 193     }
 194
 195   return 0;
 196 }
 197
 198 #define TIMEOUT 3
 199 #define TEST_FUNCTION do_test ()
 200 #include "../test-skeleton.c"