ipc/glue/CrossProcessMutex_windows.cpp@6474c204b198 (annotated)
ipc/glue/CrossProcessMutex_windows.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
| michael@0 | 2 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #include <windows.h> |
| michael@0 | 7 | |
| michael@0 | 8 | #include "base/process_util.h" |
| michael@0 | 9 | #include "CrossProcessMutex.h" |
| michael@0 | 10 | #include "nsDebug.h" |
| michael@0 | 11 | #include "nsISupportsImpl.h" |
| michael@0 | 12 | |
| michael@0 | 13 | using namespace base; |
| michael@0 | 14 | |
| michael@0 | 15 | namespace mozilla { |
| michael@0 | 16 | |
| michael@0 | 17 | CrossProcessMutex::CrossProcessMutex(const char*) |
| michael@0 | 18 | { |
| michael@0 | 19 | // We explicitly share this using DuplicateHandle, we do -not- want this to |
| michael@0 | 20 | // be inherited by child processes by default! So no security attributes are |
| michael@0 | 21 | // given. |
| michael@0 | 22 | mMutex = ::CreateMutexA(nullptr, FALSE, nullptr); |
| michael@0 | 23 | if (!mMutex) { |
| michael@0 | 24 | NS_RUNTIMEABORT("This shouldn't happen - failed to create mutex!"); |
| michael@0 | 25 | } |
| michael@0 | 26 | MOZ_COUNT_CTOR(CrossProcessMutex); |
| michael@0 | 27 | } |
| michael@0 | 28 | |
| michael@0 | 29 | CrossProcessMutex::CrossProcessMutex(CrossProcessMutexHandle aHandle) |
| michael@0 | 30 | { |
| michael@0 | 31 | DWORD flags; |
| michael@0 | 32 | if (!::GetHandleInformation(aHandle, &flags)) { |
| michael@0 | 33 | NS_RUNTIMEABORT("Attempt to construct a mutex from an invalid handle!"); |
| michael@0 | 34 | } |
| michael@0 | 35 | mMutex = aHandle; |
| michael@0 | 36 | MOZ_COUNT_CTOR(CrossProcessMutex); |
| michael@0 | 37 | } |
| michael@0 | 38 | |
| michael@0 | 39 | CrossProcessMutex::~CrossProcessMutex() |
| michael@0 | 40 | { |
| michael@0 | 41 | NS_ASSERTION(mMutex, "Improper construction of mutex or double free."); |
| michael@0 | 42 | ::CloseHandle(mMutex); |
| michael@0 | 43 | MOZ_COUNT_DTOR(CrossProcessMutex); |
| michael@0 | 44 | } |
| michael@0 | 45 | |
| michael@0 | 46 | void |
| michael@0 | 47 | CrossProcessMutex::Lock() |
| michael@0 | 48 | { |
| michael@0 | 49 | NS_ASSERTION(mMutex, "Improper construction of mutex."); |
| michael@0 | 50 | ::WaitForSingleObject(mMutex, INFINITE); |
| michael@0 | 51 | } |
| michael@0 | 52 | |
| michael@0 | 53 | void |
| michael@0 | 54 | CrossProcessMutex::Unlock() |
| michael@0 | 55 | { |
| michael@0 | 56 | NS_ASSERTION(mMutex, "Improper construction of mutex."); |
| michael@0 | 57 | ::ReleaseMutex(mMutex); |
| michael@0 | 58 | } |
| michael@0 | 59 | |
| michael@0 | 60 | CrossProcessMutexHandle |
| michael@0 | 61 | CrossProcessMutex::ShareToProcess(ProcessHandle aHandle) |
| michael@0 | 62 | { |
| michael@0 | 63 | HANDLE newHandle; |
| michael@0 | 64 | bool succeeded = ::DuplicateHandle(GetCurrentProcessHandle(), |
| michael@0 | 65 | mMutex, aHandle, &newHandle, |
| michael@0 | 66 | 0, FALSE, DUPLICATE_SAME_ACCESS); |
| michael@0 | 67 | |
| michael@0 | 68 | if (!succeeded) { |
| michael@0 | 69 | return nullptr; |
| michael@0 | 70 | } |
| michael@0 | 71 | |
| michael@0 | 72 | return newHandle; |
| michael@0 | 73 | } |
| michael@0 | 74 | |
| michael@0 | 75 | } |
