nptl/tst-mutex9.c

   1 /* Copyright (C) 2003, 2004 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   char *p;
  41
  42   fd = mkstemp (tmpfname);
  43   if (fd == -1)
  44     {
  45       printf ("cannot open temporary file: %m\n");
  46       return 1;
  47     }
  48
  49   /* Make sure it is always removed.  */
  50   unlink (tmpfname);
  51
  52   /* Create one page of data.  */
  53   memset (data, '\0', ps);
  54
  55   /* Write the data to the file.  */
  56   if (write (fd, data, ps) != (ssize_t) ps)
  57     {
  58       puts ("short write");
  59       return 1;
  60     }
  61
  62   mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  63   if (mem == MAP_FAILED)
  64     {
  65       printf ("mmap failed: %m\n");
  66       return 1;
  67     }
  68
  69   m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t))
  70                            & ~(__alignof (pthread_mutex_t) - 1));
  71   p = (char *) (m + 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   if (pthread_mutex_init (m, &a) != 0)
  92     {
  93       puts ("mutex_init failed");
  94       return 1;
  95     }
  96
  97   if (pthread_mutex_lock (m) != 0)
  98     {
  99       puts ("mutex_lock failed");
 100       return 1;
 101     }
 102
 103   if (pthread_mutexattr_destroy (&a) != 0)
 104     {
 105       puts ("mutexattr_destroy failed");
 106       return 1;
 107     }
 108
 109   puts ("going to fork now");
 110   pid = fork ();
 111   if (pid == -1)
 112     {
 113       puts ("fork failed");
 114       return 1;
 115     }
 116   else if (pid == 0)
 117     {
 118       if (pthread_mutex_trylock (m) == 0)
 119         {
 120           puts ("child: mutex_trylock succeeded");
 121           exit (1);
 122         }
 123
 124       if (pthread_mutex_unlock (m) == 0)
 125         {
 126           puts ("child: mutex_unlock succeeded");
 127           exit (1);
 128         }
 129
 130       struct timeval tv;
 131       gettimeofday (&tv, NULL);
 132       struct timespec ts;
 133       TIMEVAL_TO_TIMESPEC (&tv, &ts);
 134       ts.tv_nsec += 500000000;
 135       if (ts.tv_nsec >= 1000000000)
 136         {
 137           ++ts.tv_sec;
 138           ts.tv_nsec -= 1000000000;
 139         }
 140
 141       int e = pthread_mutex_timedlock (m, &ts);
 142       if (e == 0)
 143         {
 144           puts ("child: mutex_timedlock succeeded");
 145           exit (1);
 146         }
 147       if (e != ETIMEDOUT)
 148         {
 149           puts ("child: mutex_timedlock didn't time out");
 150           exit (1);
 151         }
 152
 153       alarm (1);
 154
 155       pthread_mutex_lock (m);
 156
 157       puts ("child: mutex_lock returned");
 158
 159       exit (0);
 160     }
 161
 162   sleep (2);
 163
 164   int status;
 165   if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 166     {
 167       puts ("waitpid failed");
 168       return 1;
 169     }
 170   if (! WIFSIGNALED (status))
 171     {
 172       puts ("child not killed by signal");
 173       return 1;
 174     }
 175   if (WTERMSIG (status) != SIGALRM)
 176     {
 177       puts ("child not killed by SIGALRM");
 178       return 1;
 179     }
 180
 181   return 0;
 182 }
 183
 184 #define TIMEOUT 3
 185 #define TEST_FUNCTION do_test ()
 186 #include "../test-skeleton.c"