73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
// Copyright 2023 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef ABSL_SYNCHRONIZATION_INTERNAL_WIN32_WAITER_H_
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#define ABSL_SYNCHRONIZATION_INTERNAL_WIN32_WAITER_H_
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#ifdef _WIN32
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#include <sdkddkver.h>
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#endif
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#if defined(_WIN32) && !defined(__MINGW32__) && \
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_WIN32_WINNT >= _WIN32_WINNT_VISTA
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#include "absl/base/config.h"
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#include "absl/synchronization/internal/kernel_timeout.h"
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#include "absl/synchronization/internal/waiter_base.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace synchronization_internal {
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#define ABSL_INTERNAL_HAVE_WIN32_WAITER 1
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class Win32Waiter : public WaiterCrtp<Win32Waiter> {
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public:
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Win32Waiter();
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bool Wait(KernelTimeout t);
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void Post();
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void Poke();
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static constexpr char kName[] = "Win32Waiter";
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private:
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// WinHelper - Used to define utilities for accessing the lock and
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// condition variable storage once the types are complete.
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class WinHelper;
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// REQUIRES: WinHelper::GetLock(this) must be held.
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void InternalCondVarPoke();
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// We can't include Windows.h in our headers, so we use aligned character
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// buffers to define the storage of SRWLOCK and CONDITION_VARIABLE.
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// SRW locks and condition variables do not need to be explicitly destroyed.
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// https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-initializesrwlock
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// https://stackoverflow.com/questions/28975958/why-does-windows-have-no-deleteconditionvariable-function-to-go-together-with
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alignas(void*) unsigned char mu_storage_[sizeof(void*)];
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alignas(void*) unsigned char cv_storage_[sizeof(void*)];
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int waiter_count_;
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int wakeup_count_;
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};
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} // namespace synchronization_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // defined(_WIN32) && !defined(__MINGW32__) &&
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// _WIN32_WINNT >= _WIN32_WINNT_VISTA
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#endif // ABSL_SYNCHRONIZATION_INTERNAL_WIN32_WAITER_H_
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