nptl/tst-cond4.c

   1 /* Copyright (C) 2002-2016 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 <unistd.h>
  25 #include <sys/mman.h>
  26 #include <sys/wait.h>
  27
  28
  29 int *condition;
  30
  31 static int
  32 do_test (void)
  33 {
  34   size_t ps = sysconf (_SC_PAGESIZE);
  35   char tmpfname[] = "/tmp/tst-cond4.XXXXXX";
  36   char data[ps];
  37   void *mem;
  38   int fd;
  39   pthread_mutexattr_t ma;
  40   pthread_mutex_t *mut1;
  41   pthread_mutex_t *mut2;
  42   pthread_condattr_t ca;
  43   pthread_cond_t *cond;
  44   pid_t pid;
  45   int result = 0;
  46   int p;
  47
  48   fd = mkstemp (tmpfname);
  49   if (fd == -1)
  50     {
  51       printf ("cannot open temporary file: %m\n");
  52       return 1;
  53     }
  54
  55   /* Make sure it is always removed.  */
  56   unlink (tmpfname);
  57
  58   /* Create one page of data.  */
  59   memset (data, '\0', ps);
  60
  61   /* Write the data to the file.  */
  62   if (write (fd, data, ps) != (ssize_t) ps)
  63     {
  64       puts ("short write");
  65       return 1;
  66     }
  67
  68   mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  69   if (mem == MAP_FAILED)
  70     {
  71       printf ("mmap failed: %m\n");
  72       return 1;
  73     }
  74
  75   mut1 = (pthread_mutex_t *) (((uintptr_t) mem
  76                                + __alignof (pthread_mutex_t))
  77                               & ~(__alignof (pthread_mutex_t) - 1));
  78   mut2 = mut1 + 1;
  79
  80   cond = (pthread_cond_t *) (((uintptr_t) (mut2 + 1)
  81                               + __alignof (pthread_cond_t))
  82                              & ~(__alignof (pthread_cond_t) - 1));
  83
  84   condition = (int *) (((uintptr_t) (cond + 1) + __alignof (int))
  85                        & ~(__alignof (int) - 1));
  86
  87   if (pthread_mutexattr_init (&ma) != 0)
  88     {
  89       puts ("mutexattr_init failed");
  90       return 1;
  91     }
  92
  93   if (pthread_mutexattr_getpshared (&ma, &p) != 0)
  94     {
  95       puts ("1st mutexattr_getpshared failed");
  96       return 1;
  97     }
  98
  99   if (p != PTHREAD_PROCESS_PRIVATE)
 100     {
 101       puts ("default pshared value wrong");
 102       return 1;
 103     }
 104
 105   if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
 106     {
 107       puts ("mutexattr_setpshared failed");
 108       return 1;
 109     }
 110
 111   if (pthread_mutexattr_getpshared (&ma, &p) != 0)
 112     {
 113       puts ("2nd mutexattr_getpshared failed");
 114       return 1;
 115     }
 116
 117   if (p != PTHREAD_PROCESS_SHARED)
 118     {
 119       puts ("pshared value after setpshared call wrong");
 120       return 1;
 121     }
 122
 123   if (pthread_mutex_init (mut1, &ma) != 0)
 124     {
 125       puts ("1st mutex_init failed");
 126       return 1;
 127     }
 128
 129   if (pthread_mutex_init (mut2, &ma) != 0)
 130     {
 131       puts ("2nd mutex_init failed");
 132       return 1;
 133     }
 134
 135   if (pthread_condattr_init (&ca) != 0)
 136     {
 137       puts ("condattr_init failed");
 138       return 1;
 139     }
 140
 141   if (pthread_condattr_getpshared (&ca, &p) != 0)
 142     {
 143       puts ("1st condattr_getpshared failed");
 144       return 1;
 145     }
 146
 147   if (p != PTHREAD_PROCESS_PRIVATE)
 148     {
 149       puts ("default value for pshared in condattr wrong");
 150       return 1;
 151     }
 152
 153   if (pthread_condattr_setpshared (&ca, PTHREAD_PROCESS_SHARED) != 0)
 154     {
 155       puts ("condattr_setpshared failed");
 156       return 1;
 157     }
 158
 159   if (pthread_condattr_getpshared (&ca, &p) != 0)
 160     {
 161       puts ("2nd condattr_getpshared failed");
 162       return 1;
 163     }
 164
 165   if (p != PTHREAD_PROCESS_SHARED)
 166     {
 167       puts ("pshared condattr still not set");
 168       return 1;
 169     }
 170
 171   if (pthread_cond_init (cond, &ca) != 0)
 172     {
 173       puts ("cond_init failed");
 174       return 1;
 175     }
 176
 177   if (pthread_mutex_lock (mut1) != 0)
 178     {
 179       puts ("parent: 1st mutex_lock failed");
 180       return 1;
 181     }
 182
 183   puts ("going to fork now");
 184   pid = fork ();
 185   if (pid == -1)
 186     {
 187       puts ("fork failed");
 188       return 1;
 189     }
 190   else if (pid == 0)
 191     {
 192       if (pthread_mutex_lock (mut2) != 0)
 193         {
 194           puts ("child: mutex_lock failed");
 195           return 1;
 196         }
 197
 198       if (pthread_mutex_unlock (mut1) != 0)
 199         {
 200           puts ("child: 1st mutex_unlock failed");
 201           return 1;
 202         }
 203
 204       do
 205         if (pthread_cond_wait (cond, mut2) != 0)
 206           {
 207             puts ("child: cond_wait failed");
 208             return 1;
 209           }
 210       while (*condition == 0);
 211
 212       if (pthread_mutex_unlock (mut2) != 0)
 213         {
 214           puts ("child: 2nd mutex_unlock failed");
 215           return 1;
 216         }
 217
 218       puts ("child done");
 219     }
 220   else
 221     {
 222       int status;
 223
 224       if (pthread_mutex_lock (mut1) != 0)
 225         {
 226           puts ("parent: 2nd mutex_lock failed");
 227           return 1;
 228         }
 229
 230       if (pthread_mutex_lock (mut2) != 0)
 231         {
 232           puts ("parent: 3rd mutex_lock failed");
 233           return 1;
 234         }
 235
 236       if (pthread_cond_signal (cond) != 0)
 237         {
 238           puts ("parent: cond_signal failed");
 239           return 1;
 240         }
 241
 242       *condition = 1;
 243
 244       if (pthread_mutex_unlock (mut2) != 0)
 245         {
 246           puts ("parent: mutex_unlock failed");
 247           return 1;
 248         }
 249
 250       puts ("waiting for child");
 251
 252       waitpid (pid, &status, 0);
 253       result |= status;
 254
 255       puts ("parent done");
 256     }
 257
 258  return result;
 259 }
 260
 261 #define TEST_FUNCTION do_test ()
 262 #include "../test-skeleton.c"