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// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* } }
// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* } }
// { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
// { dg-require-cstdint "" }
// { dg-require-gthreads "" }
// Copyright (C) 2010 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include <mutex>
#include <testsuite_hooks.h>
struct unreliable_lock
{
std::mutex m;
std::unique_lock<std::mutex> l;
static int count;
static int throw_on;
static int lock_on;
unreliable_lock() : l(m, std::defer_lock) { }
~unreliable_lock()
{
bool test __attribute__((unused)) = true;
VERIFY( !l.owns_lock() );
}
void lock()
{
if (count == throw_on)
throw throw_on;
++count;
l.lock();
}
bool try_lock()
{
if (count == throw_on)
throw throw_on;
std::unique_lock<std::mutex> l2(m, std::defer_lock);
if (count == lock_on)
l2.lock();
++count;
return l.try_lock();
}
void unlock()
{
bool test __attribute__((unused)) = true;
VERIFY( l.owns_lock() );
l.unlock();
}
};
int unreliable_lock::count = 0;
int unreliable_lock::throw_on = -1;
int unreliable_lock::lock_on = -1;
void test01()
{
bool test __attribute__((unused)) = true;
unreliable_lock l1, l2, l3;
try
{
unreliable_lock::count = 0;
int result = std::try_lock(l1, l2, l3);
VERIFY( result == -1 );
VERIFY( unreliable_lock::count == 3 );
l1.unlock();
l2.unlock();
l3.unlock();
}
catch (...)
{
VERIFY( false );
}
}
void test02()
{
bool test __attribute__((unused)) = true;
unreliable_lock l1, l2, l3;
try
{
// test behaviour when a lock is already held
unreliable_lock::lock_on = 0;
while (unreliable_lock::lock_on < 3)
{
unreliable_lock::count = 0;
int failed = std::try_lock(l1, l2, l3);
VERIFY( failed == unreliable_lock::lock_on );
++unreliable_lock::lock_on;
}
}
catch (...)
{
VERIFY( false );
}
}
void test03()
{
bool test __attribute__((unused)) = true;
unreliable_lock l1, l2, l3;
try
{
// test behaviour when an exception is thrown
unreliable_lock::throw_on = 0;
while (unreliable_lock::throw_on < 3)
{
unreliable_lock::count = 0;
int failed = std::try_lock(l1, l2, l3);
VERIFY( failed == unreliable_lock::throw_on );
++unreliable_lock::throw_on;
}
}
catch (...)
{
VERIFY( false );
}
}
int main()
{
test01();
test02();
test03();
return 0;
}
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