зеркало из https://github.com/mozilla/gecko-dev.git
69 строки
2.1 KiB
C++
69 строки
2.1 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 https://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_WinHeaderOnlyUtils_h
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#define mozilla_WinHeaderOnlyUtils_h
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#include <windows.h>
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/**
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* This header is intended for self-contained, header-only, utility code for
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* Win32. It may be used outside of xul.dll, in places such as firefox.exe or
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* mozglue.dll. If your code creates dependencies on Mozilla libraries, you
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* should put it elsewhere.
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*/
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namespace mozilla {
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// How long to wait for a created process to become available for input,
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// to prevent that process's windows being forced to the background.
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// This is used across update, restart, and the launcher.
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const DWORD kWaitForInputIdleTimeoutMS = 10*1000;
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/**
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* Wait for a child GUI process to become "idle." Idle means that the process
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* has created its message queue and has begun waiting for user input.
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*
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* Note that this must only be used when the child process is going to display
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* GUI! Otherwise you're going to be waiting for a very long time ;-)
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*
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* @return true if we successfully waited for input idle;
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* false if we timed out or failed to wait.
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*/
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inline bool
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WaitForInputIdle(HANDLE aProcess, DWORD aTimeoutMs = kWaitForInputIdleTimeoutMS)
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{
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const DWORD kSleepTimeMs = 10;
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const DWORD waitStart = aTimeoutMs == INFINITE ? 0 : ::GetTickCount();
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DWORD elapsed = 0;
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while (true) {
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if (aTimeoutMs != INFINITE) {
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elapsed = ::GetTickCount() - waitStart;
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}
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if (elapsed >= aTimeoutMs) {
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return false;
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}
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DWORD waitResult = ::WaitForInputIdle(aProcess, aTimeoutMs - elapsed);
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if (!waitResult) {
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return true;
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}
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if (waitResult == WAIT_FAILED && ::GetLastError() == ERROR_NOT_GUI_PROCESS) {
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::Sleep(kSleepTimeMs);
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continue;
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}
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return false;
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}
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}
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} // namespace mozilla
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#endif // mozilla_WinHeaderOnlyUtils_h
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