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#pragma once
#include <systemd/sd-event.h>
#include <chrono>
#include <memory>
#include <sdbusplus/bus.hpp>
// TODO: openbmc/openbmc#1720 - add error handling for sd_event API failures
namespace sdevent
{
namespace event
{
namespace timer
{
class Timer;
} // namespace timer
} // namespace event
namespace event
{
using EventPtr = sd_event*;
class Event;
/** @brief Get an instance of the 'default' event. */
Event newDefault();
namespace details
{
/** @brief unique_ptr functor to release an event reference. */
struct EventDeleter
{
void operator()(sd_event* ptr) const
{
deleter(ptr);
}
decltype(&sd_event_unref) deleter = sd_event_unref;
};
/* @brief Alias 'event' to a unique_ptr type for auto-release. */
using Event = std::unique_ptr<sd_event, EventDeleter>;
} // namespace details
/** @class Event
* @brief Provides C++ bindings to the sd_event_* class functions.
*/
class Event
{
public:
/* Define all of the basic class operations:
* Not allowed:
* - Default constructor to avoid nullptrs.
* - Copy operations due to internal unique_ptr.
* Allowed:
* - Move operations.
* - Destructor.
*/
Event() = delete;
Event(const Event&) = delete;
Event& operator=(const Event&) = delete;
Event(Event&&) = default;
Event& operator=(Event&&) = default;
~Event() = default;
/** @brief Conversion constructor from 'EventPtr'.
*
* Increments ref-count of the event-pointer and releases it when
* done.
*/
explicit Event(EventPtr e);
/** @brief Constructor for 'Event'.
*
* Takes ownership of the event-pointer and releases it when done.
*/
Event(EventPtr e, std::false_type);
/** @brief Release ownership of the stored event-pointer. */
EventPtr release()
{
return evt.release();
}
/** @brief Wait indefinitely for new event sources. */
void loop()
{
sd_event_loop(evt.get());
}
/** @brief Attach to a DBus loop. */
void attach(sdbusplus::bus::bus& bus)
{
bus.attach_event(evt.get(), SD_EVENT_PRIORITY_NORMAL);
}
/** @brief C++ wrapper for sd_event_now. */
auto now()
{
using namespace std::chrono;
uint64_t usec;
sd_event_now(evt.get(), CLOCK_MONOTONIC, &usec);
microseconds d(usec);
return steady_clock::time_point(d);
}
friend class timer::Timer;
private:
EventPtr get()
{
return evt.get();
}
details::Event evt;
};
inline Event::Event(EventPtr l) : evt(sd_event_ref(l))
{
}
inline Event::Event(EventPtr l, std::false_type) : evt(l)
{
}
inline Event newDefault()
{
sd_event* e = nullptr;
sd_event_default(&e);
return Event(e, std::false_type());
}
} // namespace event
} // namespace sdevent
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