The Tor Browser: ipc/glue/CrossProcessMutex

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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/. */

     6 #include <windows.h>

     8 #include "base/process_util.h"

     9 #include "CrossProcessMutex.h"

    10 #include "nsDebug.h"

    11 #include "nsISupportsImpl.h"

    13 using namespace base;

    15 namespace mozilla {

    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 }

    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 }

    39 CrossProcessMutex::~CrossProcessMutex()

    40 {

    41   NS_ASSERTION(mMutex, "Improper construction of mutex or double free.");

    42   ::CloseHandle(mMutex);

    43   MOZ_COUNT_DTOR(CrossProcessMutex);

    44 }

    46 void

    47 CrossProcessMutex::Lock()

    48 {

    49   NS_ASSERTION(mMutex, "Improper construction of mutex.");

    50   ::WaitForSingleObject(mMutex, INFINITE);

    51 }

    53 void

    54 CrossProcessMutex::Unlock()

    55 {

    56   NS_ASSERTION(mMutex, "Improper construction of mutex.");

    57   ::ReleaseMutex(mMutex);

    58 }

    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);

    68   if (!succeeded) {

    69     return nullptr;

    70   }

    72   return newHandle;

    73 }

    75 }

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