Imported Upstream version 1.49.0upstream/1.49.0

1 files changed, 175 insertions, 0 deletions

diff --git a/boost/interprocess/sync/spin/recursive_mutex.hpp b/boost/interprocess/sync/spin/recursive_mutex.hpp
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+++ b/boost/interprocess/sync/spin/recursive_mutex.hpp
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+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2005-2011. 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)
+//
+// See http://www.boost.org/libs/interprocess for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Parts of the pthread code come from Boost Threads code:
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (C) 2001-2003
+// William E. Kempf
+//
+// Permission to use, copy, modify, distribute and sell this software
+// and its documentation for any purpose is hereby granted without fee,
+// provided that the above copyright notice appear in all copies and
+// that both that copyright notice and this permission notice appear
+// in supporting documentation.  William E. Kempf makes no representations
+// about the suitability of this software for any purpose.
+// It is provided "as is" without express or implied warranty.
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_INTERPROCESS_DETAIL_SPIN_RECURSIVE_MUTEX_HPP
+#define BOOST_INTERPROCESS_DETAIL_SPIN_RECURSIVE_MUTEX_HPP
+
+#if (defined _MSC_VER) && (_MSC_VER >= 1200)
+#  pragma once
+#endif
+
+#include <boost/interprocess/detail/config_begin.hpp>
+#include <boost/interprocess/detail/workaround.hpp>
+
+#include <boost/interprocess/detail/posix_time_types_wrk.hpp>
+#include <boost/interprocess/detail/os_thread_functions.hpp>
+#include <boost/interprocess/exceptions.hpp>
+#include <boost/interprocess/detail/atomic.hpp>
+#include <boost/cstdint.hpp>
+#include <boost/interprocess/detail/os_thread_functions.hpp>
+#include <boost/interprocess/sync/spin/mutex.hpp>
+#include <boost/assert.hpp>
+
+namespace boost {
+namespace interprocess {
+namespace ipcdetail {
+
+class spin_recursive_mutex
+{
+   spin_recursive_mutex(const spin_recursive_mutex &);
+   spin_recursive_mutex &operator=(const spin_recursive_mutex &);
+   public:
+
+   spin_recursive_mutex();
+   ~spin_recursive_mutex();
+
+   void lock();
+   bool try_lock();
+   bool timed_lock(const boost::posix_time::ptime &abs_time);
+   void unlock();
+   void take_ownership();
+   private:
+   spin_mutex     m_mutex;
+   unsigned int   m_nLockCount;
+   volatile ipcdetail::OS_systemwide_thread_id_t   m_nOwner;
+   volatile boost::uint32_t m_s;
+};
+
+inline spin_recursive_mutex::spin_recursive_mutex() 
+   : m_nLockCount(0), m_nOwner(ipcdetail::get_invalid_systemwide_thread_id()){}
+
+inline spin_recursive_mutex::~spin_recursive_mutex(){}
+
+inline void spin_recursive_mutex::lock()
+{
+   typedef ipcdetail::OS_systemwide_thread_id_t handle_t;
+   const handle_t thr_id(ipcdetail::get_current_systemwide_thread_id());
+   handle_t old_id;
+   ipcdetail::systemwide_thread_id_copy(m_nOwner, old_id);
+   if(ipcdetail::equal_systemwide_thread_id(thr_id , old_id)){
+      if((unsigned int)(m_nLockCount+1) == 0){
+         //Overflow, throw an exception
+         throw interprocess_exception("boost::interprocess::spin_recursive_mutex recursive lock overflow");
+      } 
+      ++m_nLockCount;
+   }
+   else{
+      m_mutex.lock();
+      ipcdetail::systemwide_thread_id_copy(thr_id, m_nOwner);
+      m_nLockCount = 1;
+   }
+}
+
+inline bool spin_recursive_mutex::try_lock()
+{
+   typedef ipcdetail::OS_systemwide_thread_id_t handle_t;
+   handle_t thr_id(ipcdetail::get_current_systemwide_thread_id());
+   handle_t old_id;
+   ipcdetail::systemwide_thread_id_copy(m_nOwner, old_id);
+   if(ipcdetail::equal_systemwide_thread_id(thr_id , old_id)) {  // we own it
+      if((unsigned int)(m_nLockCount+1) == 0){
+         //Overflow, throw an exception
+         throw interprocess_exception("boost::interprocess::spin_recursive_mutex recursive lock overflow");
+      } 
+      ++m_nLockCount;
+      return true;
+   }
+   if(m_mutex.try_lock()){
+      ipcdetail::systemwide_thread_id_copy(thr_id, m_nOwner);
+      m_nLockCount = 1;
+      return true;
+   }
+   return false;
+}
+
+inline bool spin_recursive_mutex::timed_lock(const boost::posix_time::ptime &abs_time)
+{
+   typedef ipcdetail::OS_systemwide_thread_id_t handle_t;
+   if(abs_time == boost::posix_time::pos_infin){
+      this->lock();
+      return true;
+   }
+   const handle_t thr_id(ipcdetail::get_current_systemwide_thread_id());
+   handle_t old_id;
+   ipcdetail::systemwide_thread_id_copy(m_nOwner, old_id);
+   if(ipcdetail::equal_systemwide_thread_id(thr_id , old_id)) {  // we own it
+      if((unsigned int)(m_nLockCount+1) == 0){
+         //Overflow, throw an exception
+         throw interprocess_exception("boost::interprocess::spin_recursive_mutex recursive lock overflow");
+      } 
+      ++m_nLockCount;
+      return true;
+   }
+   if(m_mutex.timed_lock(abs_time)){
+      ipcdetail::systemwide_thread_id_copy(thr_id, m_nOwner);
+      m_nLockCount = 1;
+      return true;
+   }
+   return false;
+}
+
+inline void spin_recursive_mutex::unlock()
+{
+   typedef ipcdetail::OS_systemwide_thread_id_t handle_t;
+   handle_t old_id;
+   ipcdetail::systemwide_thread_id_copy(m_nOwner, old_id);
+   const handle_t thr_id(ipcdetail::get_current_systemwide_thread_id());
+   (void)old_id;
+   (void)thr_id;
+   BOOST_ASSERT(ipcdetail::equal_systemwide_thread_id(thr_id, old_id));
+   --m_nLockCount;
+   if(!m_nLockCount){
+      const handle_t new_id(ipcdetail::get_invalid_systemwide_thread_id());
+      ipcdetail::systemwide_thread_id_copy(new_id, m_nOwner);
+      m_mutex.unlock();
+   }
+}
+
+inline void spin_recursive_mutex::take_ownership()
+{
+   typedef ipcdetail::OS_systemwide_thread_id_t handle_t;
+   this->m_nLockCount = 1;
+   const handle_t thr_id(ipcdetail::get_current_systemwide_thread_id());
+   ipcdetail::systemwide_thread_id_copy(thr_id, m_nOwner);
+}
+
+}  //namespace ipcdetail {
+}  //namespace interprocess {
+}  //namespace boost {
+
+#include <boost/interprocess/detail/config_end.hpp>
+
+#endif   //BOOST_INTERPROCESS_DETAIL_SPIN_RECURSIVE_MUTEX_HPP