Added boost header

test/external/boost/thread/pthread/shared_mutex.hpp

@@ -0,0 +1,303 @@
+#ifndef BOOST_THREAD_PTHREAD_SHARED_MUTEX_HPP
+#define BOOST_THREAD_PTHREAD_SHARED_MUTEX_HPP
+
+//  (C) Copyright 2006-8 Anthony Williams
+//
+//  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 <boost/assert.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/thread/mutex.hpp>
+#include <boost/thread/condition_variable.hpp>
+#include <boost/thread/detail/thread_interruption.hpp>
+
+#include <boost/config/abi_prefix.hpp>
+
+namespace boost
+{
+    class shared_mutex
+    {
+    private:
+        struct state_data
+        {
+            unsigned shared_count;
+            bool exclusive;
+            bool upgrade;
+            bool exclusive_waiting_blocked;
+        };
+        
+
+
+        state_data state;
+        boost::mutex state_change;
+        boost::condition_variable shared_cond;
+        boost::condition_variable exclusive_cond;
+        boost::condition_variable upgrade_cond;
+
+        void release_waiters()
+        {
+            exclusive_cond.notify_one();
+            shared_cond.notify_all();
+        }
+        
+
+    public:
+        shared_mutex()
+        {
+            state_data state_={0,0,0,0};
+            state=state_;
+        }
+
+        ~shared_mutex()
+        {
+        }
+
+        void lock_shared()
+        {
+            boost::this_thread::disable_interruption do_not_disturb;
+            boost::mutex::scoped_lock lk(state_change);
+                
+            while(state.exclusive || state.exclusive_waiting_blocked)
+            {
+                shared_cond.wait(lk);
+            }
+            ++state.shared_count;
+        }
+
+        bool try_lock_shared()
+        {
+            boost::mutex::scoped_lock lk(state_change);
+                
+            if(state.exclusive || state.exclusive_waiting_blocked)
+            {
+                return false;
+            }
+            else
+            {
+                ++state.shared_count;
+                return true;
+            }
+        }
+
+        bool timed_lock_shared(system_time const& timeout)
+        {
+            boost::this_thread::disable_interruption do_not_disturb;
+            boost::mutex::scoped_lock lk(state_change);
+                
+            while(state.exclusive || state.exclusive_waiting_blocked)
+            {
+                if(!shared_cond.timed_wait(lk,timeout))
+                {
+                    return false;
+                }
+            }
+            ++state.shared_count;
+            return true;
+        }
+
+        template<typename TimeDuration>
+        bool timed_lock_shared(TimeDuration const & relative_time)
+        {
+            return timed_lock_shared(get_system_time()+relative_time);
+        }
+
+        void unlock_shared()
+        {
+            boost::mutex::scoped_lock lk(state_change);
+            bool const last_reader=!--state.shared_count;
+                
+            if(last_reader)
+            {
+                if(state.upgrade)
+                {
+                    state.upgrade=false;
+                    state.exclusive=true;
+                    upgrade_cond.notify_one();
+                }
+                else
+                {
+                    state.exclusive_waiting_blocked=false;
+                }
+                release_waiters();
+            }
+        }
+
+        void lock()
+        {
+            boost::this_thread::disable_interruption do_not_disturb;
+            boost::mutex::scoped_lock lk(state_change);
+                
+            while(state.shared_count || state.exclusive)
+            {
+                state.exclusive_waiting_blocked=true;
+                exclusive_cond.wait(lk);
+            }
+            state.exclusive=true;
+        }
+
+        bool timed_lock(system_time const& timeout)
+        {
+            boost::this_thread::disable_interruption do_not_disturb;
+            boost::mutex::scoped_lock lk(state_change);
+
+            while(state.shared_count || state.exclusive)
+            {
+                state.exclusive_waiting_blocked=true;
+                if(!exclusive_cond.timed_wait(lk,timeout))
+                {
+                    if(state.shared_count || state.exclusive)
+                    {
+                        state.exclusive_waiting_blocked=false;
+                        exclusive_cond.notify_one();
+                        return false;
+                    }
+                    break;
+                }
+            }
+            state.exclusive=true;
+            return true;
+        }
+
+        template<typename TimeDuration>
+        bool timed_lock(TimeDuration const & relative_time)
+        {
+            return timed_lock(get_system_time()+relative_time);
+        }
+
+        bool try_lock()
+        {
+            boost::mutex::scoped_lock lk(state_change);
+                
+            if(state.shared_count || state.exclusive)
+            {
+                return false;
+            }
+            else
+            {
+                state.exclusive=true;
+                return true;
+            }
+                
+        }
+
+        void unlock()
+        {
+            boost::mutex::scoped_lock lk(state_change);
+            state.exclusive=false;
+            state.exclusive_waiting_blocked=false;
+            release_waiters();
+        }
+
+        void lock_upgrade()
+        {
+            boost::this_thread::disable_interruption do_not_disturb;
+            boost::mutex::scoped_lock lk(state_change);
+            while(state.exclusive || state.exclusive_waiting_blocked || state.upgrade)
+            {
+                shared_cond.wait(lk);
+            }
+            ++state.shared_count;
+            state.upgrade=true;
+        }
+
+        bool timed_lock_upgrade(system_time const& timeout)
+        {
+            boost::this_thread::disable_interruption do_not_disturb;
+            boost::mutex::scoped_lock lk(state_change);
+            while(state.exclusive || state.exclusive_waiting_blocked || state.upgrade)
+            {
+                if(!shared_cond.timed_wait(lk,timeout))
+                {
+                    if(state.exclusive || state.exclusive_waiting_blocked || state.upgrade)
+                    {
+                        return false;
+                    }
+                    break;
+                }
+            }
+            ++state.shared_count;
+            state.upgrade=true;
+            return true;
+        }
+
+        template<typename TimeDuration>
+        bool timed_lock_upgrade(TimeDuration const & relative_time)
+        {
+            return timed_lock_upgrade(get_system_time()+relative_time);
+        }
+
+        bool try_lock_upgrade()
+        {
+            boost::mutex::scoped_lock lk(state_change);
+            if(state.exclusive || state.exclusive_waiting_blocked || state.upgrade)
+            {
+                return false;
+            }
+            else
+            {
+                ++state.shared_count;
+                state.upgrade=true;
+                return true;
+            }
+        }
+
+        void unlock_upgrade()
+        {
+            boost::mutex::scoped_lock lk(state_change);
+            state.upgrade=false;
+            bool const last_reader=!--state.shared_count;
+                
+            if(last_reader)
+            {
+                state.exclusive_waiting_blocked=false;
+                release_waiters();
+            }
+        }
+
+        void unlock_upgrade_and_lock()
+        {
+            boost::this_thread::disable_interruption do_not_disturb;
+            boost::mutex::scoped_lock lk(state_change);
+            --state.shared_count;
+            while(state.shared_count)
+            {
+                upgrade_cond.wait(lk);
+            }
+            state.upgrade=false;
+            state.exclusive=true;
+        }
+
+        void unlock_and_lock_upgrade()
+        {
+            boost::mutex::scoped_lock lk(state_change);
+            state.exclusive=false;
+            state.upgrade=true;
+            ++state.shared_count;
+            state.exclusive_waiting_blocked=false;
+            release_waiters();
+        }
+        
+        void unlock_and_lock_shared()
+        {
+            boost::mutex::scoped_lock lk(state_change);
+            state.exclusive=false;
+            ++state.shared_count;
+            state.exclusive_waiting_blocked=false;
+            release_waiters();
+        }
+        
+        void unlock_upgrade_and_lock_shared()
+        {
+            boost::mutex::scoped_lock lk(state_change);
+            state.upgrade=false;
+            state.exclusive_waiting_blocked=false;
+            release_waiters();
+        }
+    };
+}
+
+#include <boost/config/abi_suffix.hpp>
+
+#endif