nptl/tst-cond6.c

   1 /* Copyright (C) 2002-2017 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 <time.h>
  26 #include <unistd.h>
  27 #include <sys/mman.h>
  28 #include <sys/time.h>
  29 #include <sys/wait.h>
  30
  31
  32 int *condition;
  33
  34 static int
  35 do_test (void)
  36 {
  37   size_t ps = sysconf (_SC_PAGESIZE);
  38   char tmpfname[] = "/tmp/tst-cond6.XXXXXX";
  39   char data[ps];
  40   void *mem;
  41   int fd;
  42   pthread_mutexattr_t ma;
  43   pthread_mutex_t *mut1;
  44   pthread_mutex_t *mut2;
  45   pthread_condattr_t ca;
  46   pthread_cond_t *cond;
  47   pid_t pid;
  48   int result = 0;
  49
  50   fd = mkstemp (tmpfname);
  51   if (fd == -1)
  52     {
  53       printf ("cannot open temporary file: %m\n");
  54       exit (1);
  55     }
  56
  57   /* Make sure it is always removed.  */
  58   unlink (tmpfname);
  59
  60   /* Create one page of data.  */
  61   memset (data, '\0', ps);
  62
  63   /* Write the data to the file.  */
  64   if (write (fd, data, ps) != (ssize_t) ps)
  65     {
  66       puts ("short write");
  67       exit (1);
  68     }
  69
  70   mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  71   if (mem == MAP_FAILED)
  72     {
  73       printf ("mmap failed: %m\n");
  74       exit (1);
  75     }
  76
  77   mut1 = (pthread_mutex_t *) (((uintptr_t) mem
  78                                + __alignof (pthread_mutex_t))
  79                               & ~(__alignof (pthread_mutex_t) - 1));
  80   mut2 = mut1 + 1;
  81
  82   cond = (pthread_cond_t *) (((uintptr_t) (mut2 + 1)
  83                               + __alignof (pthread_cond_t))
  84                              & ~(__alignof (pthread_cond_t) - 1));
  85
  86   condition = (int *) (((uintptr_t) (cond + 1) + __alignof (int))
  87                        & ~(__alignof (int) - 1));
  88
  89   if (pthread_mutexattr_init (&ma) != 0)
  90     {
  91       puts ("mutexattr_init failed");
  92       exit (1);
  93     }
  94
  95   if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
  96     {
  97       puts ("mutexattr_setpshared failed");
  98       exit (1);
  99     }
 100
 101   if (pthread_mutex_init (mut1, &ma) != 0)
 102     {
 103       puts ("1st mutex_init failed");
 104       exit (1);
 105     }
 106
 107   if (pthread_mutex_init (mut2, &ma) != 0)
 108     {
 109       puts ("2nd mutex_init failed");
 110       exit (1);
 111     }
 112
 113   if (pthread_condattr_init (&ca) != 0)
 114     {
 115       puts ("condattr_init failed");
 116       exit (1);
 117     }
 118
 119   if (pthread_condattr_setpshared (&ca, PTHREAD_PROCESS_SHARED) != 0)
 120     {
 121       puts ("condattr_setpshared failed");
 122       exit (1);
 123     }
 124
 125   if (pthread_cond_init (cond, &ca) != 0)
 126     {
 127       puts ("cond_init failed");
 128       exit (1);
 129     }
 130
 131   if (pthread_mutex_lock (mut1) != 0)
 132     {
 133       puts ("parent: 1st mutex_lock failed");
 134       exit (1);
 135     }
 136
 137   puts ("going to fork now");
 138   pid = fork ();
 139   if (pid == -1)
 140     {
 141       puts ("fork failed");
 142       exit (1);
 143     }
 144   else if (pid == 0)
 145     {
 146       struct timespec ts;
 147       struct timeval tv;
 148
 149       if (pthread_mutex_lock (mut2) != 0)
 150         {
 151           puts ("child: mutex_lock failed");
 152           exit (1);
 153         }
 154
 155       if (pthread_mutex_unlock (mut1) != 0)
 156         {
 157           puts ("child: 1st mutex_unlock failed");
 158           exit (1);
 159         }
 160
 161       if (gettimeofday (&tv, NULL) != 0)
 162         {
 163           puts ("gettimeofday failed");
 164           exit (1);
 165         }
 166
 167       TIMEVAL_TO_TIMESPEC (&tv, &ts);
 168       ts.tv_nsec += 500000000;
 169       if (ts.tv_nsec >= 1000000000)
 170         {
 171           ts.tv_nsec -= 1000000000;
 172           ++ts.tv_sec;
 173         }
 174
 175       do
 176         if (pthread_cond_timedwait (cond, mut2, &ts) != 0)
 177           {
 178             puts ("child: cond_wait failed");
 179             exit (1);
 180           }
 181       while (*condition == 0);
 182
 183       if (pthread_mutex_unlock (mut2) != 0)
 184         {
 185           puts ("child: 2nd mutex_unlock failed");
 186           exit (1);
 187         }
 188
 189       puts ("child done");
 190     }
 191   else
 192     {
 193       int status;
 194
 195       if (pthread_mutex_lock (mut1) != 0)
 196         {
 197           puts ("parent: 2nd mutex_lock failed");
 198           exit (1);
 199         }
 200
 201       if (pthread_mutex_lock (mut2) != 0)
 202         {
 203           puts ("parent: 3rd mutex_lock failed");
 204           exit (1);
 205         }
 206
 207       if (pthread_cond_signal (cond) != 0)
 208         {
 209           puts ("parent: cond_signal failed");
 210           exit (1);
 211         }
 212
 213       *condition = 1;
 214
 215       if (pthread_mutex_unlock (mut2) != 0)
 216         {
 217           puts ("parent: mutex_unlock failed");
 218           exit (1);
 219         }
 220
 221       puts ("waiting for child");
 222
 223       waitpid (pid, &status, 0);
 224       result |= status;
 225
 226       puts ("parent done");
 227     }
 228
 229  return result;
 230 }
 231
 232 #define TEST_FUNCTION do_test ()
 233 #include "../test-skeleton.c"