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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <mutex>
// template <class ...Mutex> class scoped_lock;
// explicit scoped_lock(mutex_type& m);
#include <mutex>
#include <cassert>
#include "test_macros.h"
struct TestMutex {
bool locked = false;
TestMutex() = default;
~TestMutex() { assert(!locked); }
void lock() { assert(!locked); locked = true; }
bool try_lock() { if (locked) return false; locked = true; return true; }
void unlock() { assert(locked); locked = false; }
TestMutex(TestMutex const&) = delete;
TestMutex& operator=(TestMutex const&) = delete;
};
#if !defined(TEST_HAS_NO_EXCEPTIONS)
struct TestMutexThrows {
bool locked = false;
bool throws_on_lock = false;
TestMutexThrows() = default;
~TestMutexThrows() { assert(!locked); }
void lock() {
assert(!locked);
if (throws_on_lock) {
throw 42;
}
locked = true;
}
bool try_lock() {
if (locked) return false;
lock();
return true;
}
void unlock() { assert(locked); locked = false; }
TestMutexThrows(TestMutexThrows const&) = delete;
TestMutexThrows& operator=(TestMutexThrows const&) = delete;
};
#endif // !defined(TEST_HAS_NO_EXCEPTIONS)
int main()
{
{
using LG = std::scoped_lock<>;
LG lg;
}
{
using LG = std::scoped_lock<TestMutex>;
TestMutex m1;
{
LG lg(m1);
assert(m1.locked);
}
assert(!m1.locked);
}
{
using LG = std::scoped_lock<TestMutex, TestMutex>;
TestMutex m1, m2;
{
LG lg(m1, m2);
assert(m1.locked && m2.locked);
}
assert(!m1.locked && !m2.locked);
}
{
using LG = std::scoped_lock<TestMutex, TestMutex, TestMutex>;
TestMutex m1, m2, m3;
{
LG lg(m1, m2, m3);
assert(m1.locked && m2.locked && m3.locked);
}
assert(!m1.locked && !m2.locked && !m3.locked);
}
#if !defined(TEST_HAS_NO_EXCEPTIONS)
{
using MT = TestMutexThrows;
using LG = std::scoped_lock<MT>;
MT m1;
m1.throws_on_lock = true;
try {
LG lg(m1);
assert(false);
} catch (int) {}
assert(!m1.locked);
}
{
using MT = TestMutexThrows;
using LG = std::scoped_lock<MT, MT>;
MT m1, m2;
m1.throws_on_lock = true;
try {
LG lg(m1, m2);
assert(false);
} catch (int) {}
assert(!m1.locked && !m2.locked);
}
{
using MT = TestMutexThrows;
using LG = std::scoped_lock<MT, MT, MT>;
MT m1, m2, m3;
m2.throws_on_lock = true;
try {
LG lg(m1, m2, m3);
assert(false);
} catch (int) {}
assert(!m1.locked && !m2.locked && !m3.locked);
}
#endif
#ifdef __cpp_deduction_guides
{
TestMutex m1, m2, m3;
{
std::scoped_lock sl{};
static_assert((std::is_same<decltype(sl), std::scoped_lock<>>::value), "" );
}
{
std::scoped_lock sl{m1};
static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1)>>::value), "" );
}
{
std::scoped_lock sl{m1, m2};
static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1), decltype(m2)>>::value), "" );
}
{
std::scoped_lock sl{m1, m2, m3};
static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1), decltype(m2), decltype(m3)>>::value), "" );
}
}
#endif
}
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