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6f0fbad9ac
# `Singleton<T>` * Access to both `once_` and `instance_` must be synchronized. * Note that `absl::once_flag` itself doesn't need any sync, as it is a sync primitive itself. * But we wrap it in a `std::optional`. * The `instance_` could be put behind an atomic, but we need a mutex for `once_`. * Once we have a mutex, we actually don't need `once_` because `instance_ == nullptr` inside critical section is the exact condition to perform initialization. * Finalizer array must be put behind a mutex too. * Logging utilities no longer depends on `//base:singleton`. Let's just use `LOG(FATAL)` on error. # `SingletonMockable<T>` * Access to `mock_` must be synchronized. * We can simply use an atomic here. * Use `absl::NoDestructor` for storing the real impl. PiperOrigin-RevId: 728982963
79 lines
3.1 KiB
C++
79 lines
3.1 KiB
C++
// Copyright 2010-2021, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "win32/tip/tip_dll_module.h"
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#include <windows.h>
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#include "absl/base/call_once.h"
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#include "base/crash_report_handler.h"
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namespace mozc::win32::tsf {
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namespace {
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void TipShutdownCrashReportHandler() {
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if (CrashReportHandler::IsInitialized()) {
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// Uninitialize the breakpad.
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CrashReportHandler::Uninitialize();
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}
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}
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} // namespace
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HMODULE TipDllModule::module_handle_ = nullptr;
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bool TipDllModule::unloaded_ = false;
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absl::once_flag TipDllModule::uninitialize_once_;
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void TipComTraits::OnObjectRelease(ULONG ref) {
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if (ref == 0) {
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TipDllModule::PrepareForShutdown();
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}
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}
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void TipDllModule::PrepareForShutdown() {
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// All COM objects are now released, so our DLL is likely to be unloaded soon.
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// Here is the good point to release global resources that should not be
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// unloaded in DllMain due to the loader lock. However, it should also be
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// noted that there is a chance that AddRef() is called again and the
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// application continues to use Mozc client DLL. Actually we can observe this
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// situation inside "Visual Studio 2012 Remote Debugging Monitor" running on
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// Windows 8. Thus we must not shut down libraries that cannot be designed to
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// be re-initializable. For instance, we must not call following functions
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// here.
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// - mozc::FinalizeSingletons() - b/10233768
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// - mozc::protobuf::ShutdownProtobufLibrary() - b/2126375
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absl::call_once(uninitialize_once_, &TipShutdownCrashReportHandler);
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}
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void TipDllModule::InitForUnitTest() {
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absl::call_once(uninitialize_once_, []() {});
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}
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} // namespace mozc::win32::tsf
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