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// Copyright 2023 The Abseil 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.
//
#ifndef ABSL_SYNCHRONIZATION_INTERNAL_WIN32_WAITER_H_
#define ABSL_SYNCHRONIZATION_INTERNAL_WIN32_WAITER_H_
#ifdef _WIN32
#include <sdkddkver.h>
#endif
#if defined(_WIN32) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
#include "absl/base/config.h"
#include "absl/synchronization/internal/kernel_timeout.h"
#include "absl/synchronization/internal/waiter_base.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace synchronization_internal {
#define ABSL_INTERNAL_HAVE_WIN32_WAITER 1
class Win32Waiter : public WaiterCrtp<Win32Waiter> {
public:
Win32Waiter();
bool Wait(KernelTimeout t);
void Post();
void Poke();
static constexpr char kName[] = "Win32Waiter";
private:
// WinHelper - Used to define utilities for accessing the lock and
// condition variable storage once the types are complete.
class WinHelper;
// REQUIRES: WinHelper::GetLock(this) must be held.
void InternalCondVarPoke();
// We can't include Windows.h in our headers, so we use aligned character
// buffers to define the storage of SRWLOCK and CONDITION_VARIABLE.
// SRW locks and condition variables do not need to be explicitly destroyed.
// https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-initializesrwlock
// https://stackoverflow.com/questions/28975958/why-does-windows-have-no-deleteconditionvariable-function-to-go-together-with
alignas(void*) unsigned char mu_storage_[sizeof(void*)];
alignas(void*) unsigned char cv_storage_[sizeof(void*)];
int waiter_count_;
int wakeup_count_;
};
} // namespace synchronization_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // defined(_WIN32) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
#endif // ABSL_SYNCHRONIZATION_INTERNAL_WIN32_WAITER_H_
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