| /* |
| * Copyright (C) 2012 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. |
| */ |
| |
| #ifndef BlockingResponseMap_h |
| #define BlockingResponseMap_h |
| |
| #include <wtf/Condition.h> |
| #include <wtf/HashMap.h> |
| #include <wtf/Lock.h> |
| #include <wtf/Noncopyable.h> |
| |
| template<typename T> |
| class BlockingResponseMap { |
| WTF_MAKE_NONCOPYABLE(BlockingResponseMap); |
| public: |
| BlockingResponseMap() : m_canceled(false) { } |
| ~BlockingResponseMap() { ASSERT(m_responses.isEmpty()); } |
| |
| std::unique_ptr<T> waitForResponse(uint64_t requestID) |
| { |
| while (true) { |
| std::unique_lock<Lock> lock(m_mutex); |
| |
| if (m_canceled) |
| return nullptr; |
| |
| if (std::unique_ptr<T> response = m_responses.take(requestID)) |
| return response; |
| |
| m_condition.wait(lock); |
| } |
| |
| return nullptr; |
| } |
| |
| void didReceiveResponse(uint64_t requestID, std::unique_ptr<T> response) |
| { |
| std::lock_guard<Lock> lock(m_mutex); |
| ASSERT(!m_responses.contains(requestID)); |
| |
| m_responses.set(requestID, WTFMove(response)); |
| |
| // FIXME: Could get a slight speed-up from using notifyOne(). |
| m_condition.notifyAll(); |
| } |
| |
| void cancel() |
| { |
| m_canceled = true; |
| |
| // FIXME: Could get a slight speed-up from using notifyOne(). |
| m_condition.notifyAll(); |
| } |
| |
| private: |
| Lock m_mutex; |
| Condition m_condition; |
| |
| HashMap<uint64_t, std::unique_ptr<T>> m_responses; |
| bool m_canceled; |
| }; |
| |
| #endif // BlockingResponseMap_h |