pw_libcxx/include/__external_threading

// Copyright 2024 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

#pragma once

// libc++'s <atomic> includes this file via <__threading_support>.  It needs
// these types and functions declared, but only for use in interfaces that
// aren't supported in Pigweed, so stub declarations are all they need.

_LIBCPP_BEGIN_NAMESPACE_STD

struct __libcpp_timespec_t {
  long int tv_sec, tv_nsec;
};

using __libcpp_thread_id = int;

bool __libcpp_thread_id_equal(__libcpp_thread_id, __libcpp_thread_id);
bool __libcpp_thread_id_less(__libcpp_thread_id, __libcpp_thread_id);
__libcpp_thread_id __libcpp_thread_get_current_id();

void __libcpp_thread_sleep_for(chrono::nanoseconds);
void __libcpp_thread_yield();

// This macro is used unconditionally in <__threading_support> but defined
// there only conditionally on when <__external_threading> is not used.
#define _LIBCPP_THREAD_ABI_VISIBILITY inline _LIBCPP_INLINE_VISIBILITY

using __libcpp_mutex_t = int;
using __libcpp_recursive_mutex_t = int;
using __libcpp_condvar_t = int;

#define _LIBCPP_MUTEX_INITIALIZER {}
#define _LIBCPP_CONDVAR_INITIALIZER {}

_LIBCPP_END_NAMESPACE_STD