| /* |
| * Copyright (C) 2009, 2010 Google 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: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT |
| * OWNER OR 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 CrossThreadCopier_h |
| #define CrossThreadCopier_h |
| |
| #include "platform/PlatformExport.h" |
| #include "wtf/Assertions.h" |
| #include "wtf/Forward.h" |
| #include "wtf/Functional.h" // FunctionThreadAffinity |
| #include "wtf/PassRefPtr.h" |
| #include "wtf/RefPtr.h" |
| #include "wtf/ThreadSafeRefCounted.h" |
| #include "wtf/TypeTraits.h" |
| #include <memory> |
| |
| class SkRefCnt; |
| |
| namespace WTF { |
| |
| template <typename T> |
| class PassedWrapper; |
| |
| } |
| |
| namespace blink { |
| |
| class IntRect; |
| class IntSize; |
| class KURL; |
| class ResourceError; |
| class ResourceRequest; |
| class ResourceResponse; |
| struct CrossThreadResourceResponseData; |
| struct CrossThreadResourceRequestData; |
| template<typename T>class CrossThreadPersistent; |
| template<typename T>class CrossThreadWeakPersistent; |
| |
| template <typename T> |
| struct CrossThreadCopierPassThrough { |
| STATIC_ONLY(CrossThreadCopierPassThrough); |
| typedef T Type; |
| static Type copy(const T& parameter) |
| { |
| return parameter; |
| } |
| }; |
| |
| template <typename T, bool isArithmeticOrEnum> |
| struct CrossThreadCopierBase; |
| |
| // Arithmetic values (integers or floats) and enums can be safely copied. |
| template <typename T> |
| struct CrossThreadCopierBase<T, true> : public CrossThreadCopierPassThrough<T> { |
| STATIC_ONLY(CrossThreadCopierBase); |
| }; |
| |
| template <typename T> |
| struct CrossThreadCopier : public CrossThreadCopierBase<T, std::is_arithmetic<T>::value || std::is_enum<T>::value> { |
| STATIC_ONLY(CrossThreadCopier); |
| }; |
| |
| // CrossThreadCopier specializations follow. |
| template <typename T> |
| struct CrossThreadCopier<PassRefPtr<T>> : public CrossThreadCopierPassThrough<PassRefPtr<T>> { |
| STATIC_ONLY(CrossThreadCopier); |
| static_assert(WTF::IsSubclassOfTemplate<T, ThreadSafeRefCounted>::value || std::is_base_of<SkRefCnt, T>::value, "PassRefPtr<T> can be passed across threads only if T is ThreadSafeRefCounted or SkRefCnt."); |
| }; |
| template <typename T> |
| struct CrossThreadCopier<RefPtr<T>> : public CrossThreadCopierPassThrough<RefPtr<T>> { |
| STATIC_ONLY(CrossThreadCopier); |
| static_assert(WTF::IsSubclassOfTemplate<T, ThreadSafeRefCounted>::value || std::is_base_of<SkRefCnt, T>::value, "RefPtr<T> can be passed across threads only if T is ThreadSafeRefCounted or SkRefCnt."); |
| }; |
| |
| // nullptr_t can be passed through without any changes. |
| template <> |
| struct CrossThreadCopier<std::nullptr_t> : public CrossThreadCopierPassThrough<std::nullptr_t> { |
| STATIC_ONLY(CrossThreadCopier); |
| }; |
| |
| // To allow a type to be passed across threads using its copy constructor, add a forward declaration of the type and |
| // provide a specialization of CrossThreadCopier<T> in this file, like IntRect below. |
| template <> |
| struct CrossThreadCopier<IntRect> : public CrossThreadCopierPassThrough<IntRect> { |
| STATIC_ONLY(CrossThreadCopier); |
| }; |
| |
| template <> |
| struct CrossThreadCopier<IntSize> : public CrossThreadCopierPassThrough<IntSize> { |
| STATIC_ONLY(CrossThreadCopier); |
| }; |
| |
| template <typename T, typename Deleter> |
| struct CrossThreadCopier<std::unique_ptr<T, Deleter>> { |
| STATIC_ONLY(CrossThreadCopier); |
| using Type = std::unique_ptr<T, Deleter>; |
| static std::unique_ptr<T, Deleter> copy(std::unique_ptr<T, Deleter> pointer) |
| { |
| return pointer; // This is in fact a move. |
| } |
| }; |
| |
| template<typename T> |
| struct CrossThreadCopier<CrossThreadPersistent<T>> : public CrossThreadCopierPassThrough<CrossThreadPersistent<T>> { |
| STATIC_ONLY(CrossThreadCopier); |
| }; |
| |
| template<typename T> |
| struct CrossThreadCopier<CrossThreadWeakPersistent<T>> : public CrossThreadCopierPassThrough<CrossThreadWeakPersistent<T>> { |
| STATIC_ONLY(CrossThreadCopier); |
| }; |
| |
| template<typename T> |
| struct CrossThreadCopier<WTF::UnretainedWrapper<T, WTF::CrossThreadAffinity>> : public CrossThreadCopierPassThrough<WTF::UnretainedWrapper<T, WTF::CrossThreadAffinity>> { |
| STATIC_ONLY(CrossThreadCopier); |
| }; |
| |
| template<typename T> |
| struct CrossThreadCopier<WeakPtr<T>> : public CrossThreadCopierPassThrough<WeakPtr<T>> { |
| STATIC_ONLY(CrossThreadCopier); |
| }; |
| |
| template <typename T> |
| struct CrossThreadCopier<WTF::PassedWrapper<T>> { |
| STATIC_ONLY(CrossThreadCopier); |
| using Type = WTF::PassedWrapper<typename CrossThreadCopier<T>::Type>; |
| static Type copy(WTF::PassedWrapper<T>&& value) { return passed(CrossThreadCopier<T>::copy(value.moveOut())); } |
| }; |
| |
| template <> |
| struct CrossThreadCopier<KURL> { |
| STATIC_ONLY(CrossThreadCopier); |
| typedef KURL Type; |
| PLATFORM_EXPORT static Type copy(const KURL&); |
| }; |
| |
| template <> |
| struct CrossThreadCopier<String> { |
| STATIC_ONLY(CrossThreadCopier); |
| typedef String Type; |
| PLATFORM_EXPORT static Type copy(const String&); |
| }; |
| |
| template <> |
| struct CrossThreadCopier<ResourceError> { |
| STATIC_ONLY(CrossThreadCopier); |
| typedef ResourceError Type; |
| PLATFORM_EXPORT static Type copy(const ResourceError&); |
| }; |
| |
| template <> |
| struct CrossThreadCopier<ResourceRequest> { |
| STATIC_ONLY(CrossThreadCopier); |
| typedef WTF::PassedWrapper<std::unique_ptr<CrossThreadResourceRequestData>> Type; |
| PLATFORM_EXPORT static Type copy(const ResourceRequest&); |
| }; |
| |
| template <> |
| struct CrossThreadCopier<ResourceResponse> { |
| STATIC_ONLY(CrossThreadCopier); |
| typedef WTF::PassedWrapper<std::unique_ptr<CrossThreadResourceResponseData>> Type; |
| PLATFORM_EXPORT static Type copy(const ResourceResponse&); |
| }; |
| |
| } // namespace blink |
| |
| #endif // CrossThreadCopier_h |