| /* |
| * Copyright (C) 2013 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #if PLATFORM(MAC) |
| |
| #include <mach/message.h> |
| |
| namespace IPC { |
| |
| class ImportanceAssertion { |
| WTF_MAKE_FAST_ALLOCATED; |
| WTF_MAKE_NONCOPYABLE(ImportanceAssertion); |
| |
| public: |
| explicit ImportanceAssertion(mach_msg_header_t* header) |
| : m_voucher(0) |
| { |
| if (MACH_MSGH_BITS_HAS_VOUCHER(header->msgh_bits)) { |
| m_voucher = header->msgh_voucher_port; |
| header->msgh_voucher_port = MACH_VOUCHER_NULL; |
| header->msgh_bits &= ~(MACH_MSGH_BITS_VOUCHER_MASK | MACH_MSGH_BITS_RAISEIMP); |
| } |
| } |
| |
| ~ImportanceAssertion() |
| { |
| if (m_voucher) { |
| kern_return_t kr = mach_voucher_deallocate(m_voucher); |
| ASSERT_UNUSED(kr, !kr); |
| } |
| } |
| |
| private: |
| mach_voucher_t m_voucher; |
| }; |
| |
| } |
| |
| #endif // PLATFORM(MAC) |