From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- ipc/glue/CrossProcessMutex_windows.cpp | 65 ++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 ipc/glue/CrossProcessMutex_windows.cpp (limited to 'ipc/glue/CrossProcessMutex_windows.cpp') diff --git a/ipc/glue/CrossProcessMutex_windows.cpp b/ipc/glue/CrossProcessMutex_windows.cpp new file mode 100644 index 0000000000..d4bbe2f2ba --- /dev/null +++ b/ipc/glue/CrossProcessMutex_windows.cpp @@ -0,0 +1,65 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include + +#include "base/process_util.h" +#include "CrossProcessMutex.h" +#include "nsDebug.h" +#include "nsISupportsImpl.h" +#include "ProtocolUtils.h" + +using base::GetCurrentProcessHandle; +using base::ProcessHandle; + +namespace mozilla { + +CrossProcessMutex::CrossProcessMutex(const char*) { + // We explicitly share this using DuplicateHandle, we do -not- want this to + // be inherited by child processes by default! So no security attributes are + // given. + mMutex = ::CreateMutexA(nullptr, FALSE, nullptr); + if (!mMutex) { + MOZ_CRASH("This shouldn't happen - failed to create mutex!"); + } + MOZ_COUNT_CTOR(CrossProcessMutex); +} + +CrossProcessMutex::CrossProcessMutex(CrossProcessMutexHandle aHandle) { + DWORD flags; + if (!::GetHandleInformation(aHandle.get(), &flags)) { + MOZ_CRASH("Attempt to construct a mutex from an invalid handle!"); + } + mMutex = aHandle.release(); + MOZ_COUNT_CTOR(CrossProcessMutex); +} + +CrossProcessMutex::~CrossProcessMutex() { + NS_ASSERTION(mMutex, "Improper construction of mutex or double free."); + ::CloseHandle(mMutex); + MOZ_COUNT_DTOR(CrossProcessMutex); +} + +void CrossProcessMutex::Lock() { + NS_ASSERTION(mMutex, "Improper construction of mutex."); + ::WaitForSingleObject(mMutex, INFINITE); +} + +void CrossProcessMutex::Unlock() { + NS_ASSERTION(mMutex, "Improper construction of mutex."); + ::ReleaseMutex(mMutex); +} + +CrossProcessMutexHandle CrossProcessMutex::CloneHandle() { + HANDLE newHandle; + if (!::DuplicateHandle(GetCurrentProcess(), mMutex, GetCurrentProcess(), + &newHandle, 0, false, DUPLICATE_SAME_ACCESS)) { + return nullptr; + } + return mozilla::UniqueFileHandle(newHandle); +} + +} // namespace mozilla -- cgit v1.2.3