nptl/tst-mutex9.c

   1 /* Copyright (C) 2003-2020 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    <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/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 /* A bogus clock value that tells run_test to use pthread_mutex_timedlock
  35    rather than pthread_mutex_clocklock.  */
  36 #define CLOCK_USE_TIMEDLOCK (-1)
  37
  38 static void
  39 do_test_clock (clockid_t clockid)
  40 {
  41   const clockid_t clockid_for_get =
  42     (clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
  43   size_t ps = sysconf (_SC_PAGESIZE);
  44   char tmpfname[] = "/tmp/tst-mutex9.XXXXXX";
  45   char data[ps];
  46   void *mem;
  47   int fd;
  48   pthread_mutex_t *m;
  49   pthread_mutexattr_t a;
  50   pid_t pid;
  51
  52   fd = mkstemp (tmpfname);
  53   if (fd == -1)
  54       FAIL_EXIT1 ("cannot open temporary file: %m\n");
  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   xwrite (fd, data, ps);
  64
  65   mem = xmmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd);
  66
  67   m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t))
  68                            & ~(__alignof (pthread_mutex_t) - 1));
  69
  70   TEST_COMPARE (pthread_mutexattr_init (&a), 0);
  71
  72   TEST_COMPARE (pthread_mutexattr_setpshared (&a, PTHREAD_PROCESS_SHARED), 0);
  73
  74   TEST_COMPARE (pthread_mutexattr_settype (&a, PTHREAD_MUTEX_RECURSIVE), 0);
  75
  76 #ifdef ENABLE_PI
  77   TEST_COMPARE (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT), 0);
  78 #endif
  79
  80   int e;
  81   if ((e = pthread_mutex_init (m, &a)) != 0)
  82     {
  83 #ifdef ENABLE_PI
  84       if (e == ENOTSUP)
  85         FAIL_UNSUPPORTED ("PI mutexes unsupported");
  86 #endif
  87       FAIL_EXIT1 ("mutex_init failed");
  88     }
  89
  90   TEST_COMPARE (pthread_mutex_lock (m), 0);
  91
  92   TEST_COMPARE (pthread_mutexattr_destroy (&a), 0);
  93
  94   puts ("going to fork now");
  95   pid = xfork ();
  96   if (pid == 0)
  97     {
  98       if (pthread_mutex_trylock (m) == 0)
  99         FAIL_EXIT1 ("child: mutex_trylock succeeded");
 100
 101       if (pthread_mutex_unlock (m) == 0)
 102         FAIL_EXIT1 ("child: mutex_unlock succeeded");
 103
 104       const struct timespec ts = timespec_add (xclock_now (clockid_for_get),
 105                                                make_timespec (0, 500000000));
 106
 107       if (clockid == CLOCK_USE_TIMEDLOCK)
 108         TEST_COMPARE (pthread_mutex_timedlock (m, &ts), ETIMEDOUT);
 109       else
 110         TEST_COMPARE (pthread_mutex_clocklock (m, clockid, &ts), ETIMEDOUT);
 111
 112       alarm (1);
 113
 114       pthread_mutex_lock (m);
 115
 116       puts ("child: mutex_lock returned");
 117
 118       exit (0);
 119     }
 120
 121   sleep (2);
 122
 123   int status;
 124   if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 125     FAIL_EXIT1 ("waitpid failed");
 126   if (! WIFSIGNALED (status))
 127     FAIL_EXIT1 ("child not killed by signal");
 128   TEST_COMPARE (WTERMSIG (status), SIGALRM);
 129 }
 130
 131 static int
 132 do_test (void)
 133 {
 134   do_test_clock (CLOCK_USE_TIMEDLOCK);
 135   do_test_clock (CLOCK_REALTIME);
 136   do_test_clock (CLOCK_MONOTONIC);
 137   return 0;
 138 }
 139
 140 #include <support/test-driver.c>