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53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 ts=8 et ft=cpp : */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ProcessPriorityManager_h_
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#define mozilla_ProcessPriorityManager_h_
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namespace mozilla {
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namespace dom {
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namespace ipc {
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/**
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* Initialize the ProcessPriorityManager.
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*
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* The ProcessPriorityManager informs the hal back-end whether this is the root
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* Gecko process, and, if we're not the root, informs hal when this process
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* transitions between having no visible top-level windows, and having at least
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* one visible top-level window.
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*
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* Hal may adjust this process's operating system priority (e.g. niceness, on
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* *nix) according to these notificaitons.
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*
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* This function call does nothing if the pref for OOP tabs is not set.
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*/
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void InitProcessPriorityManager();
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/**
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* True iff the current process has foreground or higher priority as
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* computed by DOM visibility. The returned answer may not match the
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* actual OS process priority, for short intervals.
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*/
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bool CurrentProcessIsForeground();
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/**
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* Calling this function prevents us from changing this process's priority
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* for a few seconds, if that change in priority would not have taken effect
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* immediately to begin with.
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*
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* In practice, this prevents foreground --> background transitions, but not
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* background --> foreground transitions. It also does not prevent
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* transitions from an unknown priority (as happens immediately after we're
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* constructed) to a foreground priority.
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*/
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void TemporarilyLockProcessPriority();
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} // namespace ipc
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} // namespace dom
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} // namespace mozilla
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#endif
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