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ef5b21e637
Bug: webrtc:13362 Change-Id: Ida112158e4ac5f667e533a0ebfedb400c84df4d9 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/239124 Commit-Queue: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35425}
57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
/*
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* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rtc_base/win/scoped_com_initializer.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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ScopedCOMInitializer::ScopedCOMInitializer() {
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RTC_DLOG(LS_INFO) << "Single-Threaded Apartment (STA) COM thread";
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Initialize(COINIT_APARTMENTTHREADED);
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}
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// Constructor for MTA initialization.
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ScopedCOMInitializer::ScopedCOMInitializer(SelectMTA mta) {
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RTC_DLOG(LS_INFO) << "Multi-Threaded Apartment (MTA) COM thread";
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Initialize(COINIT_MULTITHREADED);
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}
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ScopedCOMInitializer::~ScopedCOMInitializer() {
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if (Succeeded()) {
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CoUninitialize();
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}
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}
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void ScopedCOMInitializer::Initialize(COINIT init) {
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// Initializes the COM library for use by the calling thread, sets the
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// thread's concurrency model, and creates a new apartment for the thread
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// if one is required. CoInitializeEx must be called at least once, and is
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// usually called only once, for each thread that uses the COM library.
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hr_ = CoInitializeEx(NULL, init);
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RTC_CHECK_NE(RPC_E_CHANGED_MODE, hr_)
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<< "Invalid COM thread model change (MTA->STA)";
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// Multiple calls to CoInitializeEx by the same thread are allowed as long
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// as they pass the same concurrency flag, but subsequent valid calls
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// return S_FALSE. To close the COM library gracefully on a thread, each
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// successful call to CoInitializeEx, including any call that returns
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// S_FALSE, must be balanced by a corresponding call to CoUninitialize.
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if (hr_ == S_OK) {
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RTC_DLOG(LS_INFO)
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<< "The COM library was initialized successfully on this thread";
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} else if (hr_ == S_FALSE) {
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RTC_DLOG(LS_WARNING)
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<< "The COM library is already initialized on this thread";
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}
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}
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} // namespace webrtc
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