67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
//
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// Copyright (C) 2007-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// { dg-do run }
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// { dg-options "-pthread" }
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// { dg-require-effective-target pthread }
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#include <cstdlib>
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#include <pthread.h>
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// This used to deadlock with the old libstdc++ because there is only one
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// global mutex guarding initialization of statics and it is held during by
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// the initializer thread of a static until the variable is completely
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// initialized. If the initializer thread creates and waits for another thread
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// which also initializes a static variable, there will be a deadlock because
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// the first thread is holding the mutex and waiting for the second thread,
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// which is blocked when it is acquiring the mutex.
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int
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get_bar (void)
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{
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return 1;
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}
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void*
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do_something (void *arg)
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{
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static int bar __attribute__((unused)) = get_bar ();
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return 0;
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}
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int
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get_foo (void)
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{
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pthread_t new_thread;
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if (pthread_create (&new_thread, 0, do_something, 0) != 0)
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std::abort ();
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if (pthread_join (new_thread, 0) != 0)
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std::abort ();
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return 1;
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}
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int
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main (int argc, char **argv)
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{
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static int foo __attribute__((unused)) = get_foo ();
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return 0;
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}
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