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// Copyright (c) 2023 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_UTIL_SIGNALINTERRUPT_H
#define BITCOIN_UTIL_SIGNALINTERRUPT_H
#ifdef WIN32
#include <condition_variable>
#include <mutex>
#else
#include <util/tokenpipe.h>
#endif
#include <atomic>
#include <cstdlib>
namespace util {
/**
* Helper class that manages an interrupt flag, and allows a thread or
* signal to interrupt another thread.
*
* This class is safe to be used in a signal handler. If sending an interrupt
* from a signal handler is not necessary, the more lightweight \ref
* CThreadInterrupt class can be used instead.
*/
class SignalInterrupt
{
public:
SignalInterrupt();
explicit operator bool() const;
[[nodiscard]] bool operator()();
[[nodiscard]] bool reset();
[[nodiscard]] bool wait();
private:
std::atomic<bool> m_flag;
#ifndef WIN32
// On UNIX-like operating systems use the self-pipe trick.
TokenPipeEnd m_pipe_r;
TokenPipeEnd m_pipe_w;
#else
// On windows use a condition variable, since we don't have any signals there
std::mutex m_mutex;
std::condition_variable m_cv;
#endif
};
} // namespace util
#endif // BITCOIN_UTIL_SIGNALINTERRUPT_H
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