nptl/tst-cond4.c

   1 /* Copyright (C) 2002-2019 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    <https://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 int *condition;
  31
  32 static int
  33 do_test (void)
  34 {
  35   size_t ps = sysconf (_SC_PAGESIZE);
  36   char tmpfname[] = "/tmp/tst-cond4.XXXXXX";
  37   char data[ps];
  38   void *mem;
  39   int fd;
  40   pthread_mutexattr_t ma;
  41   pthread_mutex_t *mut1;
  42   pthread_mutex_t *mut2;
  43   pthread_condattr_t ca;
  44   pthread_cond_t *cond;
  45   pid_t pid;
  46   int result = 0;
  47   int p;
  48
  49   fd = mkstemp (tmpfname);
  50   if (fd == -1)
  51     {
  52       printf ("cannot open temporary file: %m\n");
  53       return 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       return 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       return 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       return 1;
  92     }
  93
  94   if (pthread_mutexattr_getpshared (&ma, &p) != 0)
  95     {
  96       puts ("1st mutexattr_getpshared failed");
  97       return 1;
  98     }
  99
 100   if (p != PTHREAD_PROCESS_PRIVATE)
 101     {
 102       puts ("default pshared value wrong");
 103       return 1;
 104     }
 105
 106   if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
 107     {
 108       puts ("mutexattr_setpshared failed");
 109       return 1;
 110     }
 111
 112   if (pthread_mutexattr_getpshared (&ma, &p) != 0)
 113     {
 114       puts ("2nd mutexattr_getpshared failed");
 115       return 1;
 116     }
 117
 118   if (p != PTHREAD_PROCESS_SHARED)
 119     {
 120       puts ("pshared value after setpshared call wrong");
 121       return 1;
 122     }
 123
 124   if (pthread_mutex_init (mut1, &ma) != 0)
 125     {
 126       puts ("1st mutex_init failed");
 127       return 1;
 128     }
 129
 130   if (pthread_mutex_init (mut2, &ma) != 0)
 131     {
 132       puts ("2nd mutex_init failed");
 133       return 1;
 134     }
 135
 136   if (pthread_condattr_init (&ca) != 0)
 137     {
 138       puts ("condattr_init failed");
 139       return 1;
 140     }
 141
 142   if (pthread_condattr_getpshared (&ca, &p) != 0)
 143     {
 144       puts ("1st condattr_getpshared failed");
 145       return 1;
 146     }
 147
 148   if (p != PTHREAD_PROCESS_PRIVATE)
 149     {
 150       puts ("default value for pshared in condattr wrong");
 151       return 1;
 152     }
 153
 154   if (pthread_condattr_setpshared (&ca, PTHREAD_PROCESS_SHARED) != 0)
 155     {
 156       puts ("condattr_setpshared failed");
 157       return 1;
 158     }
 159
 160   if (pthread_condattr_getpshared (&ca, &p) != 0)
 161     {
 162       puts ("2nd condattr_getpshared failed");
 163       return 1;
 164     }
 165
 166   if (p != PTHREAD_PROCESS_SHARED)
 167     {
 168       puts ("pshared condattr still not set");
 169       return 1;
 170     }
 171
 172   if (pthread_cond_init (cond, &ca) != 0)
 173     {
 174       puts ("cond_init failed");
 175       return 1;
 176     }
 177
 178   if (pthread_mutex_lock (mut1) != 0)
 179     {
 180       puts ("parent: 1st mutex_lock failed");
 181       return 1;
 182     }
 183
 184   puts ("going to fork now");
 185   pid = fork ();
 186   if (pid == -1)
 187     {
 188       puts ("fork failed");
 189       return 1;
 190     }
 191   else if (pid == 0)
 192     {
 193       if (pthread_mutex_lock (mut2) != 0)
 194         {
 195           puts ("child: mutex_lock failed");
 196           return 1;
 197         }
 198
 199       if (pthread_mutex_unlock (mut1) != 0)
 200         {
 201           puts ("child: 1st mutex_unlock failed");
 202           return 1;
 203         }
 204
 205       do
 206         if (pthread_cond_wait (cond, mut2) != 0)
 207           {
 208             puts ("child: cond_wait failed");
 209             return 1;
 210           }
 211       while (*condition == 0);
 212
 213       if (pthread_mutex_unlock (mut2) != 0)
 214         {
 215           puts ("child: 2nd mutex_unlock failed");
 216           return 1;
 217         }
 218
 219       puts ("child done");
 220     }
 221   else
 222     {
 223       int status;
 224
 225       if (pthread_mutex_lock (mut1) != 0)
 226         {
 227           puts ("parent: 2nd mutex_lock failed");
 228           return 1;
 229         }
 230
 231       if (pthread_mutex_lock (mut2) != 0)
 232         {
 233           puts ("parent: 3rd mutex_lock failed");
 234           return 1;
 235         }
 236
 237       if (pthread_cond_signal (cond) != 0)
 238         {
 239           puts ("parent: cond_signal failed");
 240           return 1;
 241         }
 242
 243       *condition = 1;
 244
 245       if (pthread_mutex_unlock (mut2) != 0)
 246         {
 247           puts ("parent: mutex_unlock failed");
 248           return 1;
 249         }
 250
 251       puts ("waiting for child");
 252
 253       waitpid (pid, &status, 0);
 254       result |= status;
 255
 256       puts ("parent done");
 257     }
 258
 259  return result;
 260 }
 261
 262 #define TEST_FUNCTION do_test ()
 263 #include "../test-skeleton.c"