The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/ipc/glue/CrossProcessMutex_windows.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,75 @@
     1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
     1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
     1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.8 +
     1.9 +#include <windows.h>
    1.10 +
    1.11 +#include "base/process_util.h"
    1.12 +#include "CrossProcessMutex.h"
    1.13 +#include "nsDebug.h"
    1.14 +#include "nsISupportsImpl.h"
    1.15 +
    1.16 +using namespace base;
    1.17 +
    1.18 +namespace mozilla {
    1.19 +
    1.20 +CrossProcessMutex::CrossProcessMutex(const char*)
    1.21 +{
    1.22 +  // We explicitly share this using DuplicateHandle, we do -not- want this to
    1.23 +  // be inherited by child processes by default! So no security attributes are
    1.24 +  // given.
    1.25 +  mMutex = ::CreateMutexA(nullptr, FALSE, nullptr);
    1.26 +  if (!mMutex) {
    1.27 +    NS_RUNTIMEABORT("This shouldn't happen - failed to create mutex!");
    1.28 +  }
    1.29 +  MOZ_COUNT_CTOR(CrossProcessMutex);
    1.30 +}
    1.31 +
    1.32 +CrossProcessMutex::CrossProcessMutex(CrossProcessMutexHandle aHandle)
    1.33 +{
    1.34 +  DWORD flags;
    1.35 +  if (!::GetHandleInformation(aHandle, &flags)) {
    1.36 +    NS_RUNTIMEABORT("Attempt to construct a mutex from an invalid handle!");
    1.37 +  }
    1.38 +  mMutex = aHandle;
    1.39 +  MOZ_COUNT_CTOR(CrossProcessMutex);
    1.40 +}
    1.41 +
    1.42 +CrossProcessMutex::~CrossProcessMutex()
    1.43 +{
    1.44 +  NS_ASSERTION(mMutex, "Improper construction of mutex or double free.");
    1.45 +  ::CloseHandle(mMutex);
    1.46 +  MOZ_COUNT_DTOR(CrossProcessMutex);
    1.47 +}
    1.48 +
    1.49 +void
    1.50 +CrossProcessMutex::Lock()
    1.51 +{
    1.52 +  NS_ASSERTION(mMutex, "Improper construction of mutex.");
    1.53 +  ::WaitForSingleObject(mMutex, INFINITE);
    1.54 +}
    1.55 +
    1.56 +void
    1.57 +CrossProcessMutex::Unlock()
    1.58 +{
    1.59 +  NS_ASSERTION(mMutex, "Improper construction of mutex.");
    1.60 +  ::ReleaseMutex(mMutex);
    1.61 +}
    1.62 +
    1.63 +CrossProcessMutexHandle
    1.64 +CrossProcessMutex::ShareToProcess(ProcessHandle aHandle)
    1.65 +{
    1.66 +  HANDLE newHandle;
    1.67 +  bool succeeded = ::DuplicateHandle(GetCurrentProcessHandle(),
    1.68 +                                     mMutex, aHandle, &newHandle,
    1.69 +                                     0, FALSE, DUPLICATE_SAME_ACCESS);
    1.70 +
    1.71 +  if (!succeeded) {
    1.72 +    return nullptr;
    1.73 +  }
    1.74 +
    1.75 +  return newHandle;
    1.76 +}
    1.77 +
    1.78 +}