Upgrade libsrt to v1.5.3. v5.0.183 (#3808)

trunk/3rdparty/srt-1-fit/srtcore/atomic_clock.h

@@ -0,0 +1,91 @@
+/*
+ * SRT - Secure, Reliable, Transport
+ * Copyright (c) 2021 Haivision Systems Inc.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INC_SRT_SYNC_ATOMIC_CLOCK_H
+#define INC_SRT_SYNC_ATOMIC_CLOCK_H
+
+#include "sync.h"
+#include "atomic.h"
+
+namespace srt
+{
+namespace sync
+{
+
+template <class Clock>
+class AtomicDuration
+{
+    atomic<int64_t> dur;
+    typedef typename Clock::duration duration_type;
+    typedef typename Clock::time_point time_point_type;
+public:
+
+    AtomicDuration() ATR_NOEXCEPT : dur(0) {}
+
+    duration_type load()
+    {
+        int64_t val = dur.load();
+        return duration_type(val);
+    }
+
+    void store(const duration_type& d)
+    {
+        dur.store(d.count());
+    }
+
+    AtomicDuration<Clock>& operator=(const duration_type& s)
+    {
+        dur = s.count();
+        return *this;
+    }
+
+    operator duration_type() const
+    {
+        return duration_type(dur);
+    }
+};
+
+template <class Clock>
+class AtomicClock
+{
+    atomic<uint64_t> dur;
+    typedef typename Clock::duration duration_type;
+    typedef typename Clock::time_point time_point_type;
+public:
+
+    AtomicClock() ATR_NOEXCEPT : dur(0) {}
+
+    time_point_type load() const
+    {
+        int64_t val = dur.load();
+        return time_point_type(duration_type(val));
+    }
+
+    void store(const time_point_type& d)
+    {
+        dur.store(uint64_t(d.time_since_epoch().count()));
+    }
+
+    AtomicClock& operator=(const time_point_type& s)
+    {
+        dur = s.time_since_epoch().count();
+        return *this;
+    }
+
+    operator time_point_type() const
+    {
+        return time_point_type(duration_type(dur.load()));
+    }
+};
+
+} // namespace sync
+} // namespace srt
+
+#endif // INC_SRT_SYNC_ATOMIC_CLOCK_H