nptl/tst-mutex9.c

   1 /* Copyright (C) 2003-2013 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 <stdio.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <sys/mman.h>
  25 #include <sys/wait.h>
  26
  27
  28 static int
  29 do_test (void)
  30 {
  31   size_t ps = sysconf (_SC_PAGESIZE);
  32   char tmpfname[] = "/tmp/tst-mutex9.XXXXXX";
  33   char data[ps];
  34   void *mem;
  35   int fd;
  36   pthread_mutex_t *m;
  37   pthread_mutexattr_t a;
  38   pid_t pid;
  39
  40   fd = mkstemp (tmpfname);
  41   if (fd == -1)
  42     {
  43       printf ("cannot open temporary file: %m\n");
  44       return 1;
  45     }
  46
  47   /* Make sure it is always removed.  */
  48   unlink (tmpfname);
  49
  50   /* Create one page of data.  */
  51   memset (data, '\0', ps);
  52
  53   /* Write the data to the file.  */
  54   if (write (fd, data, ps) != (ssize_t) ps)
  55     {
  56       puts ("short write");
  57       return 1;
  58     }
  59
  60   mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  61   if (mem == MAP_FAILED)
  62     {
  63       printf ("mmap failed: %m\n");
  64       return 1;
  65     }
  66
  67   m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t))
  68                            & ~(__alignof (pthread_mutex_t) - 1));
  69
  70   if (pthread_mutexattr_init (&a) != 0)
  71     {
  72       puts ("mutexattr_init failed");
  73       return 1;
  74     }
  75
  76   if (pthread_mutexattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
  77     {
  78       puts ("mutexattr_setpshared failed");
  79       return 1;
  80     }
  81
  82   if (pthread_mutexattr_settype (&a, PTHREAD_MUTEX_RECURSIVE) != 0)
  83     {
  84       puts ("mutexattr_settype failed");
  85       return 1;
  86     }
  87
  88 #ifdef ENABLE_PI
  89   if (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT) != 0)
  90     {
  91       puts ("pthread_mutexattr_setprotocol failed");
  92       return 1;
  93     }
  94 #endif
  95
  96   int e;
  97   if ((e = pthread_mutex_init (m, &a)) != 0)
  98     {
  99 #ifdef ENABLE_PI
 100       if (e == ENOTSUP)
 101         {
 102           puts ("PI mutexes unsupported");
 103           return 0;
 104         }
 105 #endif
 106       puts ("mutex_init failed");
 107       return 1;
 108     }
 109
 110   if (pthread_mutex_lock (m) != 0)
 111     {
 112       puts ("mutex_lock failed");
 113       return 1;
 114     }
 115
 116   if (pthread_mutexattr_destroy (&a) != 0)
 117     {
 118       puts ("mutexattr_destroy failed");
 119       return 1;
 120     }
 121
 122   puts ("going to fork now");
 123   pid = fork ();
 124   if (pid == -1)
 125     {
 126       puts ("fork failed");
 127       return 1;
 128     }
 129   else if (pid == 0)
 130     {
 131       if (pthread_mutex_trylock (m) == 0)
 132         {
 133           puts ("child: mutex_trylock succeeded");
 134           exit (1);
 135         }
 136
 137       if (pthread_mutex_unlock (m) == 0)
 138         {
 139           puts ("child: mutex_unlock succeeded");
 140           exit (1);
 141         }
 142
 143       struct timeval tv;
 144       gettimeofday (&tv, NULL);
 145       struct timespec ts;
 146       TIMEVAL_TO_TIMESPEC (&tv, &ts);
 147       ts.tv_nsec += 500000000;
 148       if (ts.tv_nsec >= 1000000000)
 149         {
 150           ++ts.tv_sec;
 151           ts.tv_nsec -= 1000000000;
 152         }
 153
 154       e = pthread_mutex_timedlock (m, &ts);
 155       if (e == 0)
 156         {
 157           puts ("child: mutex_timedlock succeeded");
 158           exit (1);
 159         }
 160       if (e != ETIMEDOUT)
 161         {
 162           puts ("child: mutex_timedlock didn't time out");
 163           exit (1);
 164         }
 165
 166       alarm (1);
 167
 168       pthread_mutex_lock (m);
 169
 170       puts ("child: mutex_lock returned");
 171
 172       exit (0);
 173     }
 174
 175   sleep (2);
 176
 177   int status;
 178   if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 179     {
 180       puts ("waitpid failed");
 181       return 1;
 182     }
 183   if (! WIFSIGNALED (status))
 184     {
 185       puts ("child not killed by signal");
 186       return 1;
 187     }
 188   if (WTERMSIG (status) != SIGALRM)
 189     {
 190       puts ("child not killed by SIGALRM");
 191       return 1;
 192     }
 193
 194   return 0;
 195 }
 196
 197 #define TIMEOUT 3
 198 #define TEST_FUNCTION do_test ()
 199 #include "../test-skeleton.c"