nptl/tst-once5.cc

   1 /* Copyright (C) 2015 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 <string.h>
  23
  24
  25 static pthread_once_t once = PTHREAD_ONCE_INIT;
  26
  27 // Exception type thrown from the pthread_once init routine.
  28 struct OnceException { };
  29
  30 // Test iteration counter.
  31 static int niter;
  32
  33 static void
  34 init_routine (void)
  35 {
  36   if (niter < 2)
  37     throw OnceException ();
  38 }
  39
  40 // Verify that an exception thrown from the pthread_once init routine
  41 // is propagated to the pthread_once caller and that the function can
  42 // be subsequently invoked to attempt the initialization again.
  43 static int
  44 do_test (void)
  45 {
  46   int result = 1;
  47
  48   // Repeat three times, having the init routine throw the first two
  49   // times and succeed on the final attempt.
  50   for (niter = 0; niter != 3; ++niter) {
  51
  52     try {
  53       int rc = pthread_once (&once, init_routine);
  54       if (rc)
  55         fprintf (stderr, "pthread_once failed: %i (%s)\n",
  56                  rc, strerror (rc));
  57
  58       if (niter < 2)
  59         fputs ("pthread_once unexpectedly returned without"
  60                " throwing an exception", stderr);
  61     }
  62     catch (OnceException) {
  63       if (1 < niter)
  64         fputs ("pthread_once unexpectedly threw", stderr);
  65       result = 0;
  66     }
  67     catch (...) {
  68       fputs ("pthread_once threw an unknown exception", stderr);
  69     }
  70
  71     // Abort the test on the first failure.
  72     if (result)
  73       break;
  74   }
  75
  76   return result;
  77 }
  78
  79 #define TEST_FUNCTION do_test ()
  80 #include "../test-skeleton.c"