add boost on mac

macx64/include/boost/thread/executors/basic_thread_pool.hpp

@@ -0,0 +1,352 @@
+// Copyright (C) 2013-2014 Vicente J. Botet Escriba
+//
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// 2013/09 Vicente J. Botet Escriba
+//    Adapt to boost from CCIA C++11 implementation
+//    first implementation of a simple pool thread using a vector of threads and a sync_queue.
+
+#ifndef BOOST_THREAD_EXECUTORS_BASIC_THREAD_POOL_HPP
+#define BOOST_THREAD_EXECUTORS_BASIC_THREAD_POOL_HPP
+
+#include <boost/thread/detail/config.hpp>
+#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION && defined BOOST_THREAD_PROVIDES_EXECUTORS && defined BOOST_THREAD_USES_MOVE
+
+#include <boost/thread/detail/delete.hpp>
+#include <boost/thread/detail/move.hpp>
+#include <boost/thread/thread.hpp>
+#include <boost/thread/concurrent_queues/sync_queue.hpp>
+#include <boost/thread/executors/work.hpp>
+#include <boost/thread/csbl/vector.hpp>
+
+#include <boost/config/abi_prefix.hpp>
+
+namespace boost
+{
+namespace executors
+{
+  class basic_thread_pool
+  {
+  public:
+    /// type-erasure to store the works to do
+    typedef  executors::work work;
+  private:
+    typedef thread thread_t;
+    /// A move aware vector type
+    typedef csbl::vector<thread_t> thread_vector;
+
+    /// A move aware vector
+    thread_vector threads;
+    /// the thread safe work queue
+    concurrent::sync_queue<work > work_queue;
+
+  public:
+    /**
+     * Effects: try to execute one task.
+     * Returns: whether a task has been executed.
+     * Throws: whatever the current task constructor throws or the task() throws.
+     */
+    bool try_executing_one()
+    {
+      try
+      {
+        work task;
+        if (work_queue.try_pull(task) == queue_op_status::success)
+        {
+          task();
+          return true;
+        }
+        return false;
+      }
+      catch (...)
+      {
+        std::terminate();
+        //return false;
+      }
+    }
+    /**
+     * Effects: schedule one task or yields
+     * Throws: whatever the current task constructor throws or the task() throws.
+     */
+    void schedule_one_or_yield()
+    {
+        if ( ! try_executing_one())
+        {
+          this_thread::yield();
+        }
+    }
+  private:
+
+    /**
+     * The main loop of the worker threads
+     */
+    void worker_thread()
+    {
+      try
+      {
+        for(;;)
+        {
+          work task;
+          try
+          {
+            queue_op_status st = work_queue.wait_pull(task);
+            if (st == queue_op_status::closed) {
+              return;
+            }
+            task();
+          }
+          catch (boost::thread_interrupted&)
+          {
+            return;
+          }
+        }
+      }
+      catch (...)
+      {
+        std::terminate();
+        return;
+      }
+    }
+#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template <class AtThreadEntry>
+    void worker_thread1(AtThreadEntry& at_thread_entry)
+    {
+      at_thread_entry(*this);
+      worker_thread();
+    }
+#endif
+    void worker_thread2(void(*at_thread_entry)(basic_thread_pool&))
+    {
+      at_thread_entry(*this);
+      worker_thread();
+    }
+    template <class AtThreadEntry>
+    void worker_thread3(BOOST_THREAD_FWD_REF(AtThreadEntry) at_thread_entry)
+    {
+      at_thread_entry(*this);
+      worker_thread();
+    }
+    static void do_nothing_at_thread_entry(basic_thread_pool&) {}
+
+  public:
+    /// basic_thread_pool is not copyable.
+    BOOST_THREAD_NO_COPYABLE(basic_thread_pool)
+
+    /**
+     * \b Effects: creates a thread pool that runs closures on \c thread_count threads.
+     *
+     * \b Throws: Whatever exception is thrown while initializing the needed resources.
+     */
+    basic_thread_pool(unsigned const thread_count = thread::hardware_concurrency()+1)
+    {
+      try
+      {
+        threads.reserve(thread_count);
+        for (unsigned i = 0; i < thread_count; ++i)
+        {
+#if 1
+          thread th (&basic_thread_pool::worker_thread, this);
+          threads.push_back(thread_t(boost::move(th)));
+#else
+          threads.push_back(thread_t(&basic_thread_pool::worker_thread, this)); // do not compile
+#endif
+        }
+      }
+      catch (...)
+      {
+        close();
+        throw;
+      }
+    }
+    /**
+     * \b Effects: creates a thread pool that runs closures on \c thread_count threads
+     * and executes the at_thread_entry function at the entry of each created thread. .
+     *
+     * \b Throws: Whatever exception is thrown while initializing the needed resources.
+     */
+#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template <class AtThreadEntry>
+    basic_thread_pool( unsigned const thread_count, AtThreadEntry& at_thread_entry)
+    {
+      try
+      {
+        threads.reserve(thread_count);
+        for (unsigned i = 0; i < thread_count; ++i)
+        {
+          thread th (&basic_thread_pool::worker_thread1<AtThreadEntry>, this, at_thread_entry);
+          threads.push_back(thread_t(boost::move(th)));
+          //threads.push_back(thread_t(&basic_thread_pool::worker_thread, this)); // do not compile
+        }
+      }
+      catch (...)
+      {
+        close();
+        throw;
+      }
+    }
+#endif
+    basic_thread_pool( unsigned const thread_count, void(*at_thread_entry)(basic_thread_pool&))
+    {
+      try
+      {
+        threads.reserve(thread_count);
+        for (unsigned i = 0; i < thread_count; ++i)
+        {
+          thread th (&basic_thread_pool::worker_thread2, this, at_thread_entry);
+          threads.push_back(thread_t(boost::move(th)));
+          //threads.push_back(thread_t(&basic_thread_pool::worker_thread, this)); // do not compile
+        }
+      }
+      catch (...)
+      {
+        close();
+        throw;
+      }
+    }
+    template <class AtThreadEntry>
+    basic_thread_pool( unsigned const thread_count, BOOST_THREAD_FWD_REF(AtThreadEntry) at_thread_entry)
+    {
+      try
+      {
+        threads.reserve(thread_count);
+        for (unsigned i = 0; i < thread_count; ++i)
+        {
+          thread th (&basic_thread_pool::worker_thread3<AtThreadEntry>, this, boost::forward<AtThreadEntry>(at_thread_entry));
+          threads.push_back(thread_t(boost::move(th)));
+          //threads.push_back(thread_t(&basic_thread_pool::worker_thread, this)); // do not compile
+        }
+      }
+      catch (...)
+      {
+        close();
+        throw;
+      }
+    }
+    /**
+     * \b Effects: Destroys the thread pool.
+     *
+     * \b Synchronization: The completion of all the closures happen before the completion of the \c basic_thread_pool destructor.
+     */
+    ~basic_thread_pool()
+    {
+      // signal to all the worker threads that there will be no more submissions.
+      close();
+      // joins all the threads before destroying the thread pool resources (e.g. the queue).
+      interrupt_and_join();
+    }
+
+    /**
+     * \b Effects: join all the threads.
+     */
+    void join()
+    {
+      for (unsigned i = 0; i < threads.size(); ++i)
+      {
+        //threads[i].interrupt();
+        threads[i].join();
+      }
+    }
+
+    /**
+     * \b Effects: interrupt all the threads.
+     */
+    void interrupt()
+    {
+      for (unsigned i = 0; i < threads.size(); ++i)
+      {
+        threads[i].interrupt();
+      }
+    }
+
+    /**
+     * \b Effects: interrupt and join all the threads.
+     */
+    void interrupt_and_join()
+    {
+      for (unsigned i = 0; i < threads.size(); ++i)
+      {
+        threads[i].interrupt();
+        threads[i].join();
+      }
+    }
+
+    /**
+     * \b Effects: close the \c basic_thread_pool for submissions.
+     * The worker threads will work until there is no more closures to run.
+     */
+    void close()
+    {
+      work_queue.close();
+    }
+
+    /**
+     * \b Returns: whether the pool is closed for submissions.
+     */
+    bool closed()
+    {
+      return work_queue.closed();
+    }
+
+    /**
+     * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+     *
+     * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+     * If invoked closure throws an exception the \c basic_thread_pool will call \c std::terminate, as is the case with threads.
+     *
+     * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+     *
+     * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
+     * Whatever exception that can be throw while storing the closure.
+     */
+    void submit(BOOST_THREAD_RV_REF(work) closure)  {
+      work_queue.push(boost::move(closure));
+    }
+
+#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template <typename Closure>
+    void submit(Closure & closure)
+    {
+      submit(work(closure));
+    }
+#endif
+    void submit(void (*closure)())
+    {
+      submit(work(closure));
+    }
+
+    template <typename Closure>
+    void submit(BOOST_THREAD_FWD_REF(Closure) closure)
+    {
+      //submit(work(boost::forward<Closure>(closure)));
+      work w((boost::forward<Closure>(closure)));
+      submit(boost::move(w));
+    }
+
+    /**
+     * \b Requires: This must be called from an scheduled task.
+     *
+     * \b Effects: reschedule functions until pred()
+     */
+    template <typename Pred>
+    bool reschedule_until(Pred const& pred)
+    {
+      do {
+        if ( ! try_executing_one())
+        {
+          return false;
+        }
+      } while (! pred());
+      return true;
+    }
+
+  };
+}
+using executors::basic_thread_pool;
+
+}
+
+#include <boost/config/abi_suffix.hpp>
+
+#endif
+#endif