2014-09-21 17:33:12 +00:00
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// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* *-*-cygwin *-*-darwin* powerpc-ibm-aix* } }
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// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-gnu* powerpc-ibm-aix* } }
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2012-03-27 23:13:14 +00:00
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// { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
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// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
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// { dg-require-cstdint "" }
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// { dg-require-gthreads "" }
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2014-09-21 17:33:12 +00:00
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// Copyright (C) 2010-2014 Free Software Foundation, Inc.
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2012-03-27 23:13:14 +00:00
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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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// 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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// 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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#include <mutex>
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#include <testsuite_hooks.h>
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struct unreliable_lock
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{
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std::mutex m;
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std::unique_lock<std::mutex> l;
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static int count;
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static int throw_on;
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static int lock_on;
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unreliable_lock() : l(m, std::defer_lock) { }
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~unreliable_lock()
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{
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bool test __attribute__((unused)) = true;
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VERIFY( !l.owns_lock() );
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}
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void lock()
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{
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if (count == throw_on)
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throw throw_on;
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++count;
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l.lock();
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}
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bool try_lock()
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{
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if (count == throw_on)
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throw throw_on;
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std::unique_lock<std::mutex> l2(m, std::defer_lock);
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if (count == lock_on)
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l2.lock();
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++count;
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return l.try_lock();
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}
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void unlock()
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{
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bool test __attribute__((unused)) = true;
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VERIFY( l.owns_lock() );
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l.unlock();
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}
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};
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int unreliable_lock::count = 0;
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int unreliable_lock::throw_on = -1;
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int unreliable_lock::lock_on = -1;
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void test01()
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{
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bool test __attribute__((unused)) = true;
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unreliable_lock l1, l2, l3;
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try
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{
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unreliable_lock::count = 0;
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std::lock(l1, l2, l3);
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VERIFY( unreliable_lock::count == 3 );
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l1.unlock();
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l2.unlock();
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l3.unlock();
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}
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catch (...)
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{
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VERIFY( false );
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}
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}
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void test02()
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{
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bool test __attribute__((unused)) = true;
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// test behaviour when a lock is already held
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try
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{
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unreliable_lock::lock_on = 1;
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while (unreliable_lock::lock_on < 3)
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{
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unreliable_lock::count = 0;
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unreliable_lock l1, l2, l3;
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std::lock(l1, l2, l3);
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VERIFY( unreliable_lock::count > 3 );
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l1.unlock();
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l2.unlock();
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l3.unlock();
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++unreliable_lock::lock_on;
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}
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}
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catch (...)
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{
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VERIFY( false );
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}
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}
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void test03()
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{
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// test behaviour when an exception is thrown
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unreliable_lock::throw_on = 0;
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while (unreliable_lock::throw_on < 3)
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{
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unreliable_lock::count = 0;
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unreliable_lock l1, l2, l3;
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bool test = false;
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try
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{
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std::lock(l1, l2, l3);
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}
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catch (...)
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{
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test = true;
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}
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VERIFY( test );
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++unreliable_lock::throw_on;
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}
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}
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int main()
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{
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test01();
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test02();
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test03();
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return 0;
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}
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