nptl/tst-cond6.c

   1 /* Copyright (C) 2002, 2003 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <pthread.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 #if ! _POSIX_THREAD_PROCESS_SHARED
  38
  39   puts ("_POSIX_THREAD_PROCESS_SHARED not supported, test skipped");
  40   return 0;
  41
  42 #else
  43
  44   size_t ps = sysconf (_SC_PAGESIZE);
  45   char tmpfname[] = "/tmp/tst-cond6.XXXXXX";
  46   char data[ps];
  47   void *mem;
  48   int fd;
  49   pthread_mutexattr_t ma;
  50   pthread_mutex_t *mut1;
  51   pthread_mutex_t *mut2;
  52   pthread_condattr_t ca;
  53   pthread_cond_t *cond;
  54   pid_t pid;
  55   int result = 0;
  56
  57   fd = mkstemp (tmpfname);
  58   if (fd == -1)
  59     {
  60       printf ("cannot open temporary file: %m\n");
  61       exit (1);
  62     }
  63
  64   /* Make sure it is always removed.  */
  65   unlink (tmpfname);
  66
  67   /* Create one page of data.  */
  68   memset (data, '\0', ps);
  69
  70   /* Write the data to the file.  */
  71   if (write (fd, data, ps) != (ssize_t) ps)
  72     {
  73       puts ("short write");
  74       exit (1);
  75     }
  76
  77   mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  78   if (mem == MAP_FAILED)
  79     {
  80       printf ("mmap failed: %m\n");
  81       exit (1);
  82     }
  83
  84   mut1 = (pthread_mutex_t *) (((uintptr_t) mem
  85                                + __alignof (pthread_mutex_t))
  86                               & ~(__alignof (pthread_mutex_t) - 1));
  87   mut2 = mut1 + 1;
  88
  89   cond = (pthread_cond_t *) (((uintptr_t) (mut2 + 1)
  90                               + __alignof (pthread_cond_t))
  91                              & ~(__alignof (pthread_cond_t) - 1));
  92
  93   condition = (int *) (((uintptr_t) (cond + 1) + __alignof (int))
  94                        & ~(__alignof (int) - 1));
  95
  96   if (pthread_mutexattr_init (&ma) != 0)
  97     {
  98       puts ("mutexattr_init failed");
  99       exit (1);
 100     }
 101
 102   if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
 103     {
 104       puts ("mutexattr_setpshared failed");
 105       exit (1);
 106     }
 107
 108   if (pthread_mutex_init (mut1, &ma) != 0)
 109     {
 110       puts ("1st mutex_init failed");
 111       exit (1);
 112     }
 113
 114   if (pthread_mutex_init (mut2, &ma) != 0)
 115     {
 116       puts ("2nd mutex_init failed");
 117       exit (1);
 118     }
 119
 120   if (pthread_condattr_init (&ca) != 0)
 121     {
 122       puts ("condattr_init failed");
 123       exit (1);
 124     }
 125
 126   if (pthread_condattr_setpshared (&ca, PTHREAD_PROCESS_SHARED) != 0)
 127     {
 128       puts ("condattr_setpshared failed");
 129       exit (1);
 130     }
 131
 132   if (pthread_cond_init (cond, &ca) != 0)
 133     {
 134       puts ("cond_init failed");
 135       exit (1);
 136     }
 137
 138   if (pthread_mutex_lock (mut1) != 0)
 139     {
 140       puts ("parent: 1st mutex_lock failed");
 141       exit (1);
 142     }
 143
 144   puts ("going to fork now");
 145   pid = fork ();
 146   if (pid == -1)
 147     {
 148       puts ("fork failed");
 149       exit (1);
 150     }
 151   else if (pid == 0)
 152     {
 153       struct timespec ts;
 154       struct timeval tv;
 155
 156       if (pthread_mutex_lock (mut2) != 0)
 157         {
 158           puts ("child: mutex_lock failed");
 159           exit (1);
 160         }
 161
 162       if (pthread_mutex_unlock (mut1) != 0)
 163         {
 164           puts ("child: 1st mutex_unlock failed");
 165           exit (1);
 166         }
 167
 168       /* Waiting for the condition will fail.  But we want the timeout
 169          here.  */
 170       if (gettimeofday (&tv, NULL) != 0)
 171         {
 172           puts ("gettimeofday failed");
 173           exit (1);
 174         }
 175
 176       TIMEVAL_TO_TIMESPEC (&tv, &ts);
 177       ts.tv_nsec += 500000000;
 178       if (ts.tv_nsec >= 1000000000)
 179         {
 180           ts.tv_nsec -= 1000000000;
 181           ++ts.tv_sec;
 182         }
 183
 184       do
 185         if (pthread_cond_timedwait (cond, mut2, &ts) != 0)
 186           {
 187             puts ("child: cond_wait failed");
 188             exit (1);
 189           }
 190       while (*condition == 0);
 191
 192       if (pthread_mutex_unlock (mut2) != 0)
 193         {
 194           puts ("child: 2nd mutex_unlock failed");
 195           exit (1);
 196         }
 197
 198       puts ("child done");
 199     }
 200   else
 201     {
 202       int status;
 203
 204       if (pthread_mutex_lock (mut1) != 0)
 205         {
 206           puts ("parent: 2nd mutex_lock failed");
 207           exit (1);
 208         }
 209
 210       if (pthread_mutex_lock (mut2) != 0)
 211         {
 212           puts ("parent: 3rd mutex_lock failed");
 213           exit (1);
 214         }
 215
 216       if (pthread_cond_signal (cond) != 0)
 217         {
 218           puts ("parent: cond_signal failed");
 219           exit (1);
 220         }
 221
 222       *condition = 1;
 223
 224       if (pthread_mutex_unlock (mut2) != 0)
 225         {
 226           puts ("parent: mutex_unlock failed");
 227           exit (1);
 228         }
 229
 230       puts ("waiting for child");
 231
 232       waitpid (pid, &status, 0);
 233       result |= status;
 234
 235       puts ("parent done");
 236     }
 237
 238  return result;
 239 #endif
 240 }
 241
 242 #define TEST_FUNCTION do_test ()
 243 #include "../test-skeleton.c"