Subversion Repositories openrisc

// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* powerpc-ibm-aix* } }

// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* powerpc-ibm-aix* } }

// { 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, 2011, 2012 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;

}