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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/30_threads/lock/2.cc
2 // { dg-additional-options "-pthread" { target pthread } }
3 // { dg-require-effective-target c++11 }
4 // { dg-require-gthreads "" }
6 // Copyright (C) 2010-2022 Free Software Foundation, Inc.
8 // This file is part of the GNU ISO C++ Library. This library is free
9 // software; you can redistribute it and/or modify it under the
10 // terms of the GNU General Public License as published by the
11 // Free Software Foundation; either version 3, or (at your option)
14 // This library is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
19 // You should have received a copy of the GNU General Public License along
20 // with this library; see the file COPYING3. If not see
21 // <http://www.gnu.org/licenses/>.
27 #include <testsuite_hooks.h>
29 void locker(std::mutex
& m1
, std::mutex
& m2
, std::mutex
& m3
)
31 typedef std::unique_lock
<std::mutex
> lock_type
;
33 lock_type
l1(m1
, std::defer_lock
);
34 lock_type
l2(m2
, std::defer_lock
);
35 lock_type
l3(m3
, std::defer_lock
);
36 std::lock(l1
, l2
, l3
);
37 VERIFY( l1
.owns_lock() );
38 VERIFY( l2
.owns_lock() );
39 VERIFY( l3
.owns_lock() );
44 std::mutex m1
, m2
, m3
;
45 std::thread
t1(locker
, std::ref(m1
), std::ref(m2
), std::ref(m3
));
46 std::thread
t2(locker
, std::ref(m3
), std::ref(m2
), std::ref(m1
));