Paul Kirth e9d5842ac7
[libc++] Make std::unique_lock available with _LIBCPP_HAS_NO_THREADS (#99562)
This is a follow up to https://github.com/llvm/llvm-project/pull/98717,
which made lock_guard available under _LIBCPP_HAS_NO_THREADS. We can
make unique_lock available under similar circumstances. This patch
follows the example in #98717, by:

  - Removing the preprocessor guards for _LIBCPP_HAS_NO_THREADS in the
    unique_lock header.
  - providing a set of custom mutex implementations in a local header.
  - using custom locks in tests that can be made to work under
    `no-threads`.
2024-07-31 08:15:55 -07:00

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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: c++03, c++11, c++14
// <mutex>
// unique_lock
// Make sure that the implicitly-generated CTAD works.
#include <mutex>
#include "test_macros.h"
#include "types.h"
int main(int, char**) {
MyMutex mutex;
{
std::unique_lock lock(mutex);
ASSERT_SAME_TYPE(decltype(lock), std::unique_lock<MyMutex>);
}
return 0;
}