selectables.h

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// Copyright 2026 The Action Engine Authors and the Symbian SDK Authors.
// Licensed under the Apache License, Version 2.0.
// Adapted from A11 cpp/thread/thread/selectables.h at
// fcccb8cb6e1e67d7ba0822ac14cece9ee4c7091b.
 
#ifndef THREAD_FIBER_SELECTABLES_H_
#define THREAD_FIBER_SELECTABLES_H_
 
#include <atomic>
 
#include "thread/cases.h"
 
namespace thread {
 
class PermanentEvent final : public internal::Selectable {
 public:
  PermanentEvent() = default;
  PermanentEvent(const PermanentEvent&) = delete;
  PermanentEvent& operator=(const PermanentEvent&) = delete;
  ~PermanentEvent() override;
 
  void Notify();
  bool HasBeenNotified() const;
 
  Case OnEvent() const { return {const_cast<PermanentEvent*>(this)}; }
 
  bool Handle(internal::CaseInSelectClause* case_state, bool enqueue) override;
  void Unregister(internal::CaseInSelectClause* case_state) override;
 
 private:
  mutable Mutex mu_;
  std::atomic<bool> notified_{false};
  internal::CaseInSelectClause* cases_to_be_selected_ = nullptr;
};
 
Case NonSelectableCase();
Case AlwaysSelectableCase();
 
}  // namespace thread
 
#endif  // THREAD_FIBER_SELECTABLES_H_