nptl/tst-cond6.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 <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <time.h>
  25 #include <unistd.h>
  26 #include <sys/mman.h>
  27 #include <sys/time.h>
  28 #include <sys/wait.h>
  29
  30
  31 int *condition;
  32
  33 static int
  34 do_test (void)
  35 {
  36   size_t ps = sysconf (_SC_PAGESIZE);
  37   char tmpfname[] = "/tmp/tst-cond6.XXXXXX";
  38   char data[ps];
  39   void *mem;
  40   int fd;
  41   pthread_mutexattr_t ma;
  42   pthread_mutex_t *mut1;
  43   pthread_mutex_t *mut2;
  44   pthread_condattr_t ca;
  45   pthread_cond_t *cond;
  46   pid_t pid;
  47   int result = 0;
  48
  49   fd = mkstemp (tmpfname);
  50   if (fd == -1)
  51     {
  52       printf ("cannot open temporary file: %m\n");
  53       exit (1);
  54     }
  55
  56   /* Make sure it is always removed.  */
  57   unlink (tmpfname);
  58
  59   /* Create one page of data.  */
  60   memset (data, '\0', ps);
  61
  62   /* Write the data to the file.  */
  63   if (write (fd, data, ps) != (ssize_t) ps)
  64     {
  65       puts ("short write");
  66       exit (1);
  67     }
  68
  69   mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  70   if (mem == MAP_FAILED)
  71     {
  72       printf ("mmap failed: %m\n");
  73       exit (1);
  74     }
  75
  76   mut1 = (pthread_mutex_t *) (((uintptr_t) mem
  77                                + __alignof (pthread_mutex_t))
  78                               & ~(__alignof (pthread_mutex_t) - 1));
  79   mut2 = mut1 + 1;
  80
  81   cond = (pthread_cond_t *) (((uintptr_t) (mut2 + 1)
  82                               + __alignof (pthread_cond_t))
  83                              & ~(__alignof (pthread_cond_t) - 1));
  84
  85   condition = (int *) (((uintptr_t) (cond + 1) + __alignof (int))
  86                        & ~(__alignof (int) - 1));
  87
  88   if (pthread_mutexattr_init (&ma) != 0)
  89     {
  90       puts ("mutexattr_init failed");
  91       exit (1);
  92     }
  93
  94   if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
  95     {
  96       puts ("mutexattr_setpshared failed");
  97       exit (1);
  98     }
  99
 100   if (pthread_mutex_init (mut1, &ma) != 0)
 101     {
 102       puts ("1st mutex_init failed");
 103       exit (1);
 104     }
 105
 106   if (pthread_mutex_init (mut2, &ma) != 0)
 107     {
 108       puts ("2nd mutex_init failed");
 109       exit (1);
 110     }
 111
 112   if (pthread_condattr_init (&ca) != 0)
 113     {
 114       puts ("condattr_init failed");
 115       exit (1);
 116     }
 117
 118   if (pthread_condattr_setpshared (&ca, PTHREAD_PROCESS_SHARED) != 0)
 119     {
 120       puts ("condattr_setpshared failed");
 121       exit (1);
 122     }
 123
 124   if (pthread_cond_init (cond, &ca) != 0)
 125     {
 126       puts ("cond_init failed");
 127       exit (1);
 128     }
 129
 130   if (pthread_mutex_lock (mut1) != 0)
 131     {
 132       puts ("parent: 1st mutex_lock failed");
 133       exit (1);
 134     }
 135
 136   puts ("going to fork now");
 137   pid = fork ();
 138   if (pid == -1)
 139     {
 140       puts ("fork failed");
 141       exit (1);
 142     }
 143   else if (pid == 0)
 144     {
 145       struct timespec ts;
 146       struct timeval tv;
 147
 148       if (pthread_mutex_lock (mut2) != 0)
 149         {
 150           puts ("child: mutex_lock failed");
 151           exit (1);
 152         }
 153
 154       if (pthread_mutex_unlock (mut1) != 0)
 155         {
 156           puts ("child: 1st mutex_unlock failed");
 157           exit (1);
 158         }
 159
 160       if (gettimeofday (&tv, NULL) != 0)
 161         {
 162           puts ("gettimeofday failed");
 163           exit (1);
 164         }
 165
 166       TIMEVAL_TO_TIMESPEC (&tv, &ts);
 167       ts.tv_nsec += 500000000;
 168       if (ts.tv_nsec >= 1000000000)
 169         {
 170           ts.tv_nsec -= 1000000000;
 171           ++ts.tv_sec;
 172         }
 173
 174       do
 175         if (pthread_cond_timedwait (cond, mut2, &ts) != 0)
 176           {
 177             puts ("child: cond_wait failed");
 178             exit (1);
 179           }
 180       while (*condition == 0);
 181
 182       if (pthread_mutex_unlock (mut2) != 0)
 183         {
 184           puts ("child: 2nd mutex_unlock failed");
 185           exit (1);
 186         }
 187
 188       puts ("child done");
 189     }
 190   else
 191     {
 192       int status;
 193
 194       if (pthread_mutex_lock (mut1) != 0)
 195         {
 196           puts ("parent: 2nd mutex_lock failed");
 197           exit (1);
 198         }
 199
 200       if (pthread_mutex_lock (mut2) != 0)
 201         {
 202           puts ("parent: 3rd mutex_lock failed");
 203           exit (1);
 204         }
 205
 206       if (pthread_cond_signal (cond) != 0)
 207         {
 208           puts ("parent: cond_signal failed");
 209           exit (1);
 210         }
 211
 212       *condition = 1;
 213
 214       if (pthread_mutex_unlock (mut2) != 0)
 215         {
 216           puts ("parent: mutex_unlock failed");
 217           exit (1);
 218         }
 219
 220       puts ("waiting for child");
 221
 222       waitpid (pid, &status, 0);
 223       result |= status;
 224
 225       puts ("parent done");
 226     }
 227
 228  return result;
 229 }
 230
 231 #define TEST_FUNCTION do_test ()
 232 #include "../test-skeleton.c"