forked from mirrors/gecko-dev
16b2bfd512
Differential Revision: https://phabricator.services.mozilla.com/D59160 --HG-- extra : moz-landing-system : lando
38 lines
1.5 KiB
C++
38 lines
1.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* some utilities for Gecko to use for Servo initialization and assertions */
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#ifndef mozilla_ServoUtils_h
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#define mozilla_ServoUtils_h
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#include "mozilla/Assertions.h"
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#include "MainThreadUtils.h"
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namespace mozilla {
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// Defined in GeckoBindings.cpp.
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void InitializeServo();
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void ShutdownServo();
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void AssertIsMainThreadOrServoFontMetricsLocked();
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class ServoStyleSet;
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extern ServoStyleSet* sInServoTraversal;
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inline bool IsInServoTraversal() {
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// The callers of this function are generally main-thread-only _except_
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// for potentially running during the Servo traversal, in which case they may
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// take special paths that avoid writing to caches and the like. In order
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// to allow those callers to branch efficiently without checking TLS, we
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// maintain this static boolean. However, the danger is that those callers
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// are generally unprepared to deal with non-Servo-but-also-non-main-thread
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// callers, and are likely to take the main-thread codepath if this function
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// returns false. So we assert against other non-main-thread callers here.
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MOZ_ASSERT(sInServoTraversal || NS_IsMainThread());
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return sInServoTraversal;
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}
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} // namespace mozilla
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#endif // mozilla_ServoUtils_h
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