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73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
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// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/threading/scoped_blocking_call.h"
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#include "base/lazy_instance.h"
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#include "base/threading/thread_local.h"
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namespace base {
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namespace {
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LazyInstance<ThreadLocalPointer<internal::BlockingObserver>>::Leaky
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tls_blocking_observer = LAZY_INSTANCE_INITIALIZER;
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// Last ScopedBlockingCall instantiated on this thread.
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LazyInstance<ThreadLocalPointer<ScopedBlockingCall>>::Leaky
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tls_last_scoped_blocking_call = LAZY_INSTANCE_INITIALIZER;
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} // namespace
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ScopedBlockingCall::ScopedBlockingCall(BlockingType blocking_type)
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: blocking_observer_(tls_blocking_observer.Get().Get()),
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previous_scoped_blocking_call_(tls_last_scoped_blocking_call.Get().Get()),
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is_will_block_(blocking_type == BlockingType::WILL_BLOCK ||
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(previous_scoped_blocking_call_ &&
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previous_scoped_blocking_call_->is_will_block_)) {
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tls_last_scoped_blocking_call.Get().Set(this);
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if (blocking_observer_) {
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if (!previous_scoped_blocking_call_) {
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blocking_observer_->BlockingStarted(blocking_type);
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} else if (blocking_type == BlockingType::WILL_BLOCK &&
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!previous_scoped_blocking_call_->is_will_block_) {
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blocking_observer_->BlockingTypeUpgraded();
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}
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}
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}
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ScopedBlockingCall::~ScopedBlockingCall() {
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DCHECK_EQ(this, tls_last_scoped_blocking_call.Get().Get());
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tls_last_scoped_blocking_call.Get().Set(previous_scoped_blocking_call_);
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if (blocking_observer_ && !previous_scoped_blocking_call_)
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blocking_observer_->BlockingEnded();
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}
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namespace internal {
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void SetBlockingObserverForCurrentThread(BlockingObserver* blocking_observer) {
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DCHECK(!tls_blocking_observer.Get().Get());
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tls_blocking_observer.Get().Set(blocking_observer);
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}
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void ClearBlockingObserverForTesting() {
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tls_blocking_observer.Get().Set(nullptr);
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}
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ScopedClearBlockingObserverForTesting::ScopedClearBlockingObserverForTesting()
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: blocking_observer_(tls_blocking_observer.Get().Get()) {
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tls_blocking_observer.Get().Set(nullptr);
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}
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ScopedClearBlockingObserverForTesting::
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~ScopedClearBlockingObserverForTesting() {
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DCHECK(!tls_blocking_observer.Get().Get());
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tls_blocking_observer.Get().Set(blocking_observer_);
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}
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} // namespace internal
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} // namespace base
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