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#pragma once
#include "public.h"
#include <util/system/platform.h>
#ifdef _win_
#include <util/system/pipe.h>
#endif
namespace NYT::NThreading {
////////////////////////////////////////////////////////////////////////////////
//! Provides a handle which can be used to wake up a polling thread.
/*!
* Internally implemented via |eventfd| API (for Linux) or pipes (for all other platforms).
*/
class TNotificationHandle
{
public:
explicit TNotificationHandle(bool blocking = false);
~TNotificationHandle();
//! Called from an arbitrary thread to wake up the polling thread.
//! Multiple wakeups are coalesced.
void Raise();
//! Called from the polling thread to clear all outstanding notification.
void Clear();
//! Returns the pollable handle, which becomes readable when #Raise is invoked.
int GetFD() const;
private:
#ifdef _linux_
int EventFD_ = -1;
#elif defined(_win_)
TPipeHandle Reader_;
TPipeHandle Writer_;
#else
int PipeFDs_[2] = {-1, -1};
#endif
};
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NThreading
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