38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
// Copyright 2023 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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#ifndef __SVR2_GROUPCLOCK_GROUPCLOCK_H__
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#define __SVR2_GROUPCLOCK_GROUPCLOCK_H__
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#include <stdint.h>
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#include <atomic>
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#include <mutex>
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#include "util/macros.h"
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#include "util/mutex.h"
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#include "util/ticks.h"
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#include "peerid/peerid.h"
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#include "context/context.h"
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namespace svr2::groupclock {
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// Clock that returns time based on times reported from a group of
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// peers. The reported time will be the median of all reported times.
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class Clock {
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public:
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DELETE_COPY_AND_ASSIGN(Clock);
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Clock() : local_(0) {};
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void SetLocalTime(util::UnixSecs secs);
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void SetRemoteTime(context::Context* ctx, const peerid::PeerID& peer, util::UnixSecs secs) EXCLUDES(mu_);
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util::UnixSecs GetTime(context::Context* ctx, const std::set<peerid::PeerID>& remotes) const EXCLUDES(mu_);
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util::UnixSecs GetLocalTime() const;
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private:
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mutable util::mutex mu_;
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std::atomic<util::UnixSecs> local_;
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std::map<peerid::PeerID, util::UnixSecs> remotes_ GUARDED_BY(mu_);
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};
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} // namespace svr2::groupclock
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#endif
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