74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
// Copyright 2020 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#ifndef BASE_THREADING_SCOPED_BLOCKING_CALL_INTERNAL_H_
|
|
#define BASE_THREADING_SCOPED_BLOCKING_CALL_INTERNAL_H_
|
|
|
|
#include "base/base_export.h"
|
|
#include "base/debug/activity_tracker.h"
|
|
#include "base/macros.h"
|
|
|
|
namespace base {
|
|
|
|
enum class BlockingType;
|
|
|
|
// Implementation details of types in scoped_blocking_call.h and classes for a
|
|
// few key //base types to observe and react to blocking calls.
|
|
namespace internal {
|
|
|
|
// Interface for an observer to be informed when a thread enters or exits
|
|
// the scope of ScopedBlockingCall objects.
|
|
class BASE_EXPORT BlockingObserver {
|
|
public:
|
|
virtual ~BlockingObserver() = default;
|
|
|
|
// Invoked when a ScopedBlockingCall is instantiated on the observed thread
|
|
// where there wasn't an existing ScopedBlockingCall.
|
|
virtual void BlockingStarted(BlockingType blocking_type) = 0;
|
|
|
|
// Invoked when a WILL_BLOCK ScopedBlockingCall is instantiated on the
|
|
// observed thread where there was a MAY_BLOCK ScopedBlockingCall but not a
|
|
// WILL_BLOCK ScopedBlockingCall.
|
|
virtual void BlockingTypeUpgraded() = 0;
|
|
|
|
// Invoked when the last ScopedBlockingCall on the observed thread is
|
|
// destroyed.
|
|
virtual void BlockingEnded() = 0;
|
|
};
|
|
|
|
// Registers |blocking_observer| on the current thread. It is invalid to call
|
|
// this on a thread where there is an active ScopedBlockingCall.
|
|
BASE_EXPORT void SetBlockingObserverForCurrentThread(
|
|
BlockingObserver* blocking_observer);
|
|
|
|
BASE_EXPORT void ClearBlockingObserverForCurrentThread();
|
|
|
|
// Common implementation class for both ScopedBlockingCall and
|
|
// ScopedBlockingCallWithBaseSyncPrimitives without assertions.
|
|
class BASE_EXPORT UncheckedScopedBlockingCall {
|
|
public:
|
|
explicit UncheckedScopedBlockingCall(const Location& from_here,
|
|
BlockingType blocking_type);
|
|
~UncheckedScopedBlockingCall();
|
|
|
|
private:
|
|
internal::BlockingObserver* const blocking_observer_;
|
|
|
|
// Previous ScopedBlockingCall instantiated on this thread.
|
|
UncheckedScopedBlockingCall* const previous_scoped_blocking_call_;
|
|
|
|
// Whether the BlockingType of the current thread was WILL_BLOCK after this
|
|
// ScopedBlockingCall was instantiated.
|
|
const bool is_will_block_;
|
|
|
|
base::debug::ScopedActivity scoped_activity_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(UncheckedScopedBlockingCall);
|
|
};
|
|
|
|
} // namespace internal
|
|
} // namespace base
|
|
|
|
#endif // BASE_THREADING_SCOPED_BLOCKING_CALL_INTERNAL_H_
|