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// Copyright 2020 the V8 project 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 V8_HEAP_CPPGC_TASK_HANDLE_H_
#define V8_HEAP_CPPGC_TASK_HANDLE_H_
#include <memory>
#include "src/base/logging.h"
namespace cppgc {
namespace internal {
// A handle that is used for cancelling individual tasks.
struct SingleThreadedHandle {
struct NonEmptyTag {};
// Default construction results in empty handle.
SingleThreadedHandle() = default;
explicit SingleThreadedHandle(NonEmptyTag)
: is_cancelled_(std::make_shared<bool>(false)) {}
void Cancel() {
DCHECK(is_cancelled_);
*is_cancelled_ = true;
}
bool IsCanceled() const {
DCHECK(is_cancelled_);
return *is_cancelled_;
}
// A handle is active if it is non-empty and not cancelled.
explicit operator bool() const {
return is_cancelled_.get() && !*is_cancelled_.get();
}
private:
std::shared_ptr<bool> is_cancelled_;
};
} // namespace internal
} // namespace cppgc
#endif // V8_HEAP_CPPGC_TASK_HANDLE_H_
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