From b51965dddbed68f23c5e8c169c23c794313ce5f6 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 28 Jun 2011 17:17:23 +0200
Subject: Add boost subset as an implementation detail

---
 .../smart_ptr/detail/atomic_count_pthreads.hpp     | 96 ++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 cutl/details/boost/smart_ptr/detail/atomic_count_pthreads.hpp

(limited to 'cutl/details/boost/smart_ptr/detail/atomic_count_pthreads.hpp')

diff --git a/cutl/details/boost/smart_ptr/detail/atomic_count_pthreads.hpp b/cutl/details/boost/smart_ptr/detail/atomic_count_pthreads.hpp
new file mode 100644
index 0000000..711494d
--- /dev/null
+++ b/cutl/details/boost/smart_ptr/detail/atomic_count_pthreads.hpp
@@ -0,0 +1,96 @@
+#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_PTHREADS_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_PTHREADS_HPP_INCLUDED
+
+//
+//  boost/detail/atomic_count_pthreads.hpp
+//
+//  Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd.
+//
+// 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)
+//
+
+#include <pthread.h>
+
+//
+//  The generic pthread_mutex-based implementation sometimes leads to
+//    inefficiencies. Example: a class with two atomic_count members
+//    can get away with a single mutex.
+//
+//  Users can detect this situation by checking BOOST_AC_USE_PTHREADS.
+//
+
+namespace cutl_details_boost
+{
+
+namespace detail
+{
+
+class atomic_count
+{
+private:
+
+    class scoped_lock
+    {
+    public:
+
+        scoped_lock(pthread_mutex_t & m): m_(m)
+        {
+            pthread_mutex_lock(&m_);
+        }
+
+        ~scoped_lock()
+        {
+            pthread_mutex_unlock(&m_);
+        }
+
+    private:
+
+        pthread_mutex_t & m_;
+    };
+
+public:
+
+    explicit atomic_count(long v): value_(v)
+    {
+        pthread_mutex_init(&mutex_, 0);
+    }
+
+    ~atomic_count()
+    {
+        pthread_mutex_destroy(&mutex_);
+    }
+
+    long operator++()
+    {
+        scoped_lock lock(mutex_);
+        return ++value_;
+    }
+
+    long operator--()
+    {
+        scoped_lock lock(mutex_);
+        return --value_;
+    }
+
+    operator long() const
+    {
+        scoped_lock lock(mutex_);
+        return value_;
+    }
+
+private:
+
+    atomic_count(atomic_count const &);
+    atomic_count & operator=(atomic_count const &);
+
+    mutable pthread_mutex_t mutex_;
+    long value_;
+};
+
+} // namespace detail
+
+} // namespace cutl_details_boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_PTHREADS_HPP_INCLUDED
-- 
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