зеркало из https://github.com/mozilla/gecko-dev.git
46 строки
1.6 KiB
C++
46 строки
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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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#ifndef GLOBALSEMAPHORE_H
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#define GLOBALSEMAPHORE_H
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namespace mozilla {
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#ifdef XP_WIN
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# include <windows.h>
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using GlobalSemHandle = HANDLE;
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#else
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# include <semaphore.h>
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using GlobalSemHandle = sem_t*;
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#endif
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/*
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* nameToken should be a string very briefly naming the semaphore you are
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* creating, and it should be unique systemwide except for across multiple
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* instances of the same application.
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* installPath should be the path to the directory containing the application.
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*
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* Taken together, those two parameters will be used to form a string which is
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* unique to this copy of this application.
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* Creating the semaphore will fail if the final string (the token plus the path
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* hash) is longer than the platform's maximum. On Windows that's MAX_PATH, on
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* POSIX systems it's either _POSIX_PATH_MAX or perhaps SEM_NAME_LEN.
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*
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* Returns nullptr upon failure, on all platforms.
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*/
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GlobalSemHandle OpenGlobalSemaphore(const char* nameToken,
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const char16_t* installPath);
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void ReleaseGlobalSemaphore(GlobalSemHandle sem);
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// aResult will be set to true if another instance *was* found, false if not.
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// Return value is true on success, false on error (and aResult won't be set).
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bool IsOtherInstanceRunning(GlobalSemHandle sem, bool* aResult);
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}; // namespace mozilla
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#endif // GLOBALEMAPHORE_H
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