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