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/*
* Copyright (C) 2013 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.
* * 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 ExecutionContextTask_h
#define ExecutionContextTask_h
#include "wtf/FastAllocBase.h"
#include "wtf/Functional.h"
#include "wtf/Noncopyable.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/text/WTFString.h"
namespace blink {
class ExecutionContext;
class ExecutionContextTask {
WTF_MAKE_NONCOPYABLE(ExecutionContextTask);
WTF_MAKE_FAST_ALLOCATED;
public:
ExecutionContextTask() { }
virtual ~ExecutionContextTask() { }
virtual void performTask(ExecutionContext*) = 0;
// Certain tasks get marked specially so that they aren't discarded, and are executed, when the context is shutting down its message queue.
virtual bool isCleanupTask() const { return false; }
virtual String taskNameForInstrumentation() const { return String(); }
};
class CallClosureTask final : public ExecutionContextTask {
public:
// Do not use |create| other than in createCrossThreadTask and
// createSameThreadTask.
// See http://crbug.com/390851
static PassOwnPtr<CallClosureTask> create(PassOwnPtr<Closure> closure)
{
return adoptPtr(new CallClosureTask(closure));
}
virtual void performTask(ExecutionContext*) override { (*m_closure)(); }
private:
explicit CallClosureTask(PassOwnPtr<Closure> closure) : m_closure(closure) { }
OwnPtr<Closure> m_closure;
};
// Create tasks passed within a single thread.
// When posting tasks within a thread, use |createSameThreadTask| instead
// of using |bind| directly to state explicitly that there is no need to care
// about thread safety when posting the task.
// When posting tasks across threads, use |createCrossThreadTask|.
template<typename FunctionType, typename... P>
PassOwnPtr<ExecutionContextTask> createSameThreadTask(
FunctionType function, const P&... parameters)
{
return CallClosureTask::create(bind(function, parameters...));
}
} // namespace
#endif
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