Remove unused or obsolete classes and files

beast/clock/basic_seconds_clock.h

@@ -0,0 +1,217 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of Beast: https://github.com/vinniefalco/Beast
+    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef BEAST_CHRONO_BASIC_SECONDS_CLOCK_H_INCLUDED
+#define BEAST_CHRONO_BASIC_SECONDS_CLOCK_H_INCLUDED
+
+#include <beast/clock/chrono_util.h>
+
+#include <algorithm>
+#include <chrono>
+#include <condition_variable>
+#include <mutex>
+#include <thread>
+#include <vector>
+
+namespace beast {
+
+namespace detail {
+
+class seconds_clock_worker
+{
+public:
+    virtual void sample () = 0;
+};
+
+//------------------------------------------------------------------------------
+
+// Updates the clocks
+class seconds_clock_thread
+{
+public:
+    using mutex = std::mutex;
+    using cond_var = std::condition_variable;
+    using lock_guard = std::lock_guard <mutex>;
+    using unique_lock = std::unique_lock <mutex>;
+    using clock_type = std::chrono::steady_clock;
+    using seconds = std::chrono::seconds;
+    using thread = std::thread;
+    using workers = std::vector <seconds_clock_worker*>;
+
+    bool stop_;
+    mutex mutex_;
+    cond_var cond_;
+    workers workers_;
+    thread thread_;
+
+    seconds_clock_thread ()
+        : stop_ (false)
+    {
+        thread_ = thread (std::bind(
+            &seconds_clock_thread::run, this));
+    }
+
+    ~seconds_clock_thread ()
+    {
+        stop();
+    }
+
+    void add (seconds_clock_worker& w)
+    {
+        lock_guard lock (mutex_);
+        workers_.push_back (&w);
+    }
+
+    void remove (seconds_clock_worker& w)
+    {
+        lock_guard lock (mutex_);
+        workers_.erase (std::find (
+            workers_.begin (), workers_.end(), &w));
+    }
+
+    void stop()
+    {
+        if (thread_.joinable())
+        {
+            {
+                lock_guard lock (mutex_);
+                stop_ = true;
+            }
+            cond_.notify_all();
+            thread_.join();
+        }
+    }
+
+    void run()
+    {
+        unique_lock lock (mutex_);;
+
+        for (;;)
+        {
+            for (auto iter : workers_)
+                iter->sample();
+
+            using namespace std::chrono;
+            clock_type::time_point const when (
+                floor <seconds> (
+                    clock_type::now().time_since_epoch()) +
+                        seconds (1));
+
+            if (cond_.wait_until (lock, when, [this]{ return stop_; }))
+                return;
+        }
+    }
+
+    static seconds_clock_thread& instance ()
+    {
+        static seconds_clock_thread singleton;
+        return singleton;
+    }
+};
+
+}
+
+//------------------------------------------------------------------------------
+
+/** Called before main exits to terminate the utility thread.
+    This is a workaround for Visual Studio 2013:
+    http://connect.microsoft.com/VisualStudio/feedback/details/786016/creating-a-global-c-object-that-used-thread-join-in-its-destructor-causes-a-lockup
+    http://stackoverflow.com/questions/10915233/stdthreadjoin-hangs-if-called-after-main-exits-when-using-vs2012-rc
+*/
+inline
+void
+basic_seconds_clock_main_hook()
+{
+#ifdef _MSC_VER
+    detail::seconds_clock_thread::instance().stop();
+#endif
+}
+
+/** A clock whose minimum resolution is one second.
+
+    The purpose of this class is to optimize the performance of the now()
+    member function call. It uses a dedicated thread that wakes up at least
+    once per second to sample the requested trivial clock.
+
+    @tparam Clock A type meeting these requirements:
+        http://en.cppreference.com/w/cpp/concept/Clock
+*/
+template <class Clock>
+class basic_seconds_clock
+{
+public:
+    using rep = typename Clock::rep;
+    using period = typename Clock::period;
+    using duration = typename Clock::duration;
+    using time_point = typename Clock::time_point;
+
+    static bool const is_steady = Clock::is_steady;
+
+    static time_point now()
+    {
+        // Make sure the thread is constructed before the
+        // worker otherwise we will crash during destruction
+        // of objects with static storage duration.
+        struct initializer
+        {
+            initializer ()
+            {
+                detail::seconds_clock_thread::instance();
+            }
+        };
+        static initializer init;
+
+        struct worker : detail::seconds_clock_worker
+        {
+            time_point m_now;
+            std::mutex mutex_;
+
+            worker()
+                : m_now(Clock::now())
+            {
+                detail::seconds_clock_thread::instance().add(*this);
+            }
+
+            ~worker()
+            {
+                detail::seconds_clock_thread::instance().remove(*this);
+            }
+
+            time_point now()
+            {
+                std::lock_guard<std::mutex> lock (mutex_);
+                return m_now;
+            }
+
+            void sample()
+            {
+                std::lock_guard<std::mutex> lock (mutex_);
+                m_now = Clock::now();
+            }
+        };
+
+        static worker w;
+
+        return w.now();
+    }
+};
+
+}
+
+#endif