nptl/tst-once5.cc

   1 /* Copyright (C) 2015-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <pthread.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22
  23
  24 static pthread_once_t once = PTHREAD_ONCE_INIT;
  25
  26 // Exception type thrown from the pthread_once init routine.
  27 struct OnceException { };
  28
  29 // Test iteration counter.
  30 static int niter;
  31
  32 static void
  33 init_routine (void)
  34 {
  35   if (niter < 2)
  36     throw OnceException ();
  37 }
  38
  39 // Verify that an exception thrown from the pthread_once init routine
  40 // is propagated to the pthread_once caller and that the function can
  41 // be subsequently invoked to attempt the initialization again.
  42 static int
  43 do_test (void)
  44 {
  45   int result = 1;
  46
  47   // Repeat three times, having the init routine throw the first two
  48   // times and succeed on the final attempt.
  49   for (niter = 0; niter != 3; ++niter) {
  50
  51     try {
  52       int rc = pthread_once (&once, init_routine);
  53       if (rc)
  54         fprintf (stderr, "pthread_once failed: %i (%s)\n",
  55                  rc, strerror (rc));
  56
  57       if (niter < 2)
  58         fputs ("pthread_once unexpectedly returned without"
  59                " throwing an exception", stderr);
  60     }
  61     catch (OnceException) {
  62       if (niter > 1)
  63         fputs ("pthread_once unexpectedly threw", stderr);
  64       result = 0;
  65     }
  66     catch (...) {
  67       fputs ("pthread_once threw an unknown exception", stderr);
  68     }
  69
  70     // Abort the test on the first failure.
  71     if (result)
  72       break;
  73   }
  74
  75   return result;
  76 }
  77
  78 #define TEST_FUNCTION do_test ()
  79 #include "../test-skeleton.c"