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// 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"
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>
PassOwnPtr<Function<typename WTF::FunctionWrapper<FunctionType>::ResultType(FreeVariableTypes...), WTF::CrossThreadAffinity>> threadSafeBind(
FunctionType function,
const Ps&... parameters)
{
return WTF::bindInternal<WTF::CrossThreadAffinity, FreeVariableTypes...>(
function,
CrossThreadCopier<Ps>::copy(parameters)...);
}
} // namespace blink
#endif // ThreadSafeFunctional_h
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