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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// <atomic>
// struct atomic_flag
// void clear(memory_order = memory_order_seq_cst);
// void clear(memory_order = memory_order_seq_cst) volatile;
#include <atomic>
#include <cassert>
int main()
{
{
std::atomic_flag f; // uninitialized
f.clear();
assert(f.test_and_set() == 0);
f.clear();
assert(f.test_and_set() == 0);
}
{
std::atomic_flag f;
f.clear(std::memory_order_relaxed);
assert(f.test_and_set() == 0);
f.clear(std::memory_order_relaxed);
assert(f.test_and_set() == 0);
}
{
std::atomic_flag f;
f.clear(std::memory_order_release);
assert(f.test_and_set() == 0);
f.clear(std::memory_order_release);
assert(f.test_and_set() == 0);
}
{
std::atomic_flag f;
f.clear(std::memory_order_seq_cst);
assert(f.test_and_set() == 0);
f.clear(std::memory_order_seq_cst);
assert(f.test_and_set() == 0);
}
{
volatile std::atomic_flag f;
f.clear();
assert(f.test_and_set() == 0);
f.clear();
assert(f.test_and_set() == 0);
}
{
volatile std::atomic_flag f;
f.clear(std::memory_order_relaxed);
assert(f.test_and_set() == 0);
f.clear(std::memory_order_relaxed);
assert(f.test_and_set() == 0);
}
{
volatile std::atomic_flag f;
f.clear(std::memory_order_release);
assert(f.test_and_set() == 0);
f.clear(std::memory_order_release);
assert(f.test_and_set() == 0);
}
{
volatile std::atomic_flag f;
f.clear(std::memory_order_seq_cst);
assert(f.test_and_set() == 0);
f.clear(std::memory_order_seq_cst);
assert(f.test_and_set() == 0);
}
}
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