| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef ThreadSafeFunctional_h |
| #define ThreadSafeFunctional_h |
| |
| #include "platform/CrossThreadCopier.h" |
| #include "wtf/Functional.h" |
| #include <type_traits> |
| |
| namespace blink { |
| |
| // threadSafeBind() is bind() for cross-thread task posting. |
| // threadSafeBind() applies CrossThreadCopier to the arguments. |
| // |
| // Example: |
| // void func1(int, const String&); |
| // f = threadSafeBind(func1, 42, str); |
| // func1(42, str2) will be called when |f()| is executed, |
| // where |str2| is a deep copy of |str| (created by str.isolatedCopy()). |
| // |
| // threadSafeBind(str) is similar to bind(str.isolatedCopy()), but the latter |
| // is NOT thread-safe due to temporary objects (https://crbug.com/390851). |
| // |
| // Don't (if you pass the task across threads): |
| // bind(func1, 42, str); |
| // bind(func1, 42, str.isolatedCopy()); |
| |
| template<typename... FreeVariableTypes, typename FunctionType, typename... Ps> |
| std::unique_ptr<Function<typename WTF::FunctionWrapper<FunctionType>::ResultType(FreeVariableTypes...), WTF::CrossThreadAffinity>> threadSafeBind( |
| FunctionType function, |
| Ps&&... parameters) |
| { |
| return WTF::bindInternal<WTF::CrossThreadAffinity, FreeVariableTypes...>( |
| function, |
| CrossThreadCopier<typename std::decay<Ps>::type>::copy(std::forward<Ps>(parameters))...); |
| } |
| |
| } // namespace blink |
| |
| #endif // ThreadSafeFunctional_h |
