nptl/tst-barrier2.c

   1 /* Copyright (C) 2002-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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/wait.h>
  28
  29
  30 static int
  31 do_test (void)
  32 {
  33   size_t ps = sysconf (_SC_PAGESIZE);
  34   char tmpfname[] = "/tmp/tst-barrier2.XXXXXX";
  35   char data[ps];
  36   void *mem;
  37   int fd;
  38   pthread_barrier_t *b;
  39   pthread_barrierattr_t a;
  40   pid_t pid;
  41   int serials = 0;
  42   int cnt;
  43   int status;
  44   int p;
  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   b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t))
  74                              & ~(__alignof (pthread_barrier_t) - 1));
  75
  76   if (pthread_barrierattr_init (&a) != 0)
  77     {
  78       puts ("barrierattr_init failed");
  79       return 1;
  80     }
  81
  82   if (pthread_barrierattr_getpshared (&a, &p) != 0)
  83     {
  84       puts ("1st barrierattr_getpshared failed");
  85       return 1;
  86     }
  87
  88   if (p != PTHREAD_PROCESS_PRIVATE)
  89     {
  90       puts ("default pshared value wrong");
  91       return 1;
  92     }
  93
  94   if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
  95     {
  96       puts ("barrierattr_setpshared failed");
  97       return 1;
  98     }
  99
 100   if (pthread_barrierattr_getpshared (&a, &p) != 0)
 101     {
 102       puts ("2nd barrierattr_getpshared failed");
 103       return 1;
 104     }
 105
 106   if (p != PTHREAD_PROCESS_SHARED)
 107     {
 108       puts ("pshared value after setpshared call wrong");
 109       return 1;
 110     }
 111
 112   if (pthread_barrier_init (b, &a, 2) != 0)
 113     {
 114       puts ("barrier_init failed");
 115       return 1;
 116     }
 117
 118   if (pthread_barrierattr_destroy (&a) != 0)
 119     {
 120       puts ("barrierattr_destroy failed");
 121       return 1;
 122     }
 123
 124   puts ("going to fork now");
 125   pid = fork ();
 126   if (pid == -1)
 127     {
 128       puts ("fork failed");
 129       return 1;
 130     }
 131
 132   /* Just to be sure we don't hang forever.  */
 133   alarm (4);
 134
 135 #define N 30
 136   for (cnt = 0; cnt < N; ++cnt)
 137     {
 138       int e;
 139
 140       e = pthread_barrier_wait (b);
 141       if (e == PTHREAD_BARRIER_SERIAL_THREAD)
 142         ++serials;
 143       else if (e != 0)
 144         {
 145           printf ("%s: barrier_wait returned value %d != 0 and PTHREAD_BARRIER_SERIAL_THREAD\n",
 146                   pid == 0 ? "child" : "parent", e);
 147           return 1;
 148         }
 149     }
 150
 151   alarm (0);
 152
 153   printf ("%s: was %d times the serial thread\n",
 154           pid == 0 ? "child" : "parent", serials);
 155
 156   if (pid == 0)
 157     /* The child.  Pass the number of times we had the serializing
 158        thread back to the parent.  */
 159     exit (serials);
 160
 161   if (waitpid (pid, &status, 0) != pid)
 162     {
 163       puts ("waitpid failed");
 164       return 1;
 165     }
 166
 167   if (!WIFEXITED (status))
 168     {
 169       puts ("child exited abnormally");
 170       return 1;
 171     }
 172
 173   if (WEXITSTATUS (status) + serials != N)
 174     {
 175       printf ("total number of serials is %d, expected %d\n",
 176               WEXITSTATUS (status) + serials, N);
 177       return 1;
 178     }
 179
 180   return 0;
 181 }
 182
 183 #define TEST_FUNCTION do_test ()
 184 #include "../test-skeleton.c"