nptl/tst-mutex9.c

   1 /* Copyright (C) 2003-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   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 <unistd.h>
  26 #include <sys/mman.h>
  27 #include <sys/time.h>
  28 #include <sys/wait.h>
  29 #include <support/check.h>
  30 #include <support/timespec.h>
  31 #include <support/xunistd.h>
  32
  33
  34 static int
  35 do_test (void)
  36 {
  37   size_t ps = sysconf (_SC_PAGESIZE);
  38   char tmpfname[] = "/tmp/tst-mutex9.XXXXXX";
  39   char data[ps];
  40   void *mem;
  41   int fd;
  42   pthread_mutex_t *m;
  43   pthread_mutexattr_t a;
  44   pid_t pid;
  45
  46   fd = mkstemp (tmpfname);
  47   if (fd == -1)
  48       FAIL_EXIT1 ("cannot open temporary file: %m\n");
  49
  50   /* Make sure it is always removed.  */
  51   unlink (tmpfname);
  52
  53   /* Create one page of data.  */
  54   memset (data, '\0', ps);
  55
  56   /* Write the data to the file.  */
  57   xwrite (fd, data, ps);
  58
  59   mem = xmmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd);
  60
  61   m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t))
  62                            & ~(__alignof (pthread_mutex_t) - 1));
  63
  64   TEST_COMPARE (pthread_mutexattr_init (&a), 0);
  65
  66   TEST_COMPARE (pthread_mutexattr_setpshared (&a, PTHREAD_PROCESS_SHARED), 0);
  67
  68   TEST_COMPARE (pthread_mutexattr_settype (&a, PTHREAD_MUTEX_RECURSIVE), 0);
  69
  70 #ifdef ENABLE_PI
  71   TEST_COMPARE (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT), 0);
  72 #endif
  73
  74   int e;
  75   if ((e = pthread_mutex_init (m, &a)) != 0)
  76     {
  77 #ifdef ENABLE_PI
  78       if (e == ENOTSUP)
  79         FAIL_UNSUPPORTED ("PI mutexes unsupported");
  80 #endif
  81       FAIL_EXIT1 ("mutex_init failed");
  82     }
  83
  84   TEST_COMPARE (pthread_mutex_lock (m), 0);
  85
  86   TEST_COMPARE (pthread_mutexattr_destroy (&a), 0);
  87
  88   puts ("going to fork now");
  89   pid = xfork ();
  90   if (pid == 0)
  91     {
  92       if (pthread_mutex_trylock (m) == 0)
  93         FAIL_EXIT1 ("child: mutex_trylock succeeded");
  94
  95       if (pthread_mutex_unlock (m) == 0)
  96         FAIL_EXIT1 ("child: mutex_unlock succeeded");
  97
  98       const struct timespec ts = timespec_add (xclock_now (CLOCK_REALTIME),
  99                                                make_timespec (0, 500000000));
 100
 101       TEST_COMPARE (pthread_mutex_timedlock (m, &ts), ETIMEDOUT);
 102
 103       alarm (1);
 104
 105       pthread_mutex_lock (m);
 106
 107       puts ("child: mutex_lock returned");
 108
 109       exit (0);
 110     }
 111
 112   sleep (2);
 113
 114   int status;
 115   if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 116     FAIL_EXIT1 ("waitpid failed");
 117   if (! WIFSIGNALED (status))
 118     FAIL_EXIT1 ("child not killed by signal");
 119   TEST_COMPARE (WTERMSIG (status), SIGALRM);
 120
 121   return 0;
 122 }
 123
 124 #include <support/test-driver.c>