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This change helps generalize shutdown code so an interrupt can be provided to libbitcoinkernel callers. This may also be useful to eventually de-globalize all of the shutdown code. Co-authored-by: Russell Yanofsky <russ@yanofsky.org> Co-authored-by: TheCharlatan <seb.kung@gmail.com>
42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
// Copyright (c) 2016-2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_UTIL_THREADINTERRUPT_H
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#define BITCOIN_UTIL_THREADINTERRUPT_H
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#include <sync.h>
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#include <threadsafety.h>
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#include <atomic>
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#include <chrono>
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#include <condition_variable>
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/**
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* A helper class for interruptible sleeps. Calling operator() will interrupt
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* any current sleep, and after that point operator bool() will return true
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* until reset.
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*
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* This class should not be used in a signal handler. It uses thread
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* synchronization primitives that are not safe to use with signals. If sending
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* an interrupt from a signal handler is necessary, the \ref SignalInterrupt
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* class can be used instead.
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*/
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class CThreadInterrupt
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{
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public:
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using Clock = std::chrono::steady_clock;
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CThreadInterrupt();
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explicit operator bool() const;
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void operator()() EXCLUSIVE_LOCKS_REQUIRED(!mut);
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void reset();
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bool sleep_for(Clock::duration rel_time) EXCLUSIVE_LOCKS_REQUIRED(!mut);
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private:
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std::condition_variable cond;
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Mutex mut;
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std::atomic<bool> flag;
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};
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#endif // BITCOIN_UTIL_THREADINTERRUPT_H
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