Imported existing code

libraries/include/boost/interprocess/sync/emulation/interprocess_semaphore.hpp

@@ -0,0 +1,75 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2005-2008. 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.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#include<boost/interprocess/exceptions.hpp>
+#include <boost/interprocess/detail/posix_time_types_wrk.hpp>
+#include <boost/interprocess/sync/scoped_lock.hpp>
+
+namespace boost {
+namespace interprocess {
+
+inline interprocess_semaphore::~interprocess_semaphore()
+{}
+
+inline interprocess_semaphore::interprocess_semaphore(int initialCount)
+   :  m_mut(), m_cond(), m_count(initialCount)
+{}
+
+inline void interprocess_semaphore::post()
+{
+   scoped_lock<interprocess_mutex> lock(m_mut);
+   if(m_count == 0){
+      m_cond.notify_one();
+   }
+   ++m_count;
+}
+
+inline void interprocess_semaphore::wait()
+{
+   scoped_lock<interprocess_mutex> lock(m_mut);
+   while(m_count == 0){
+      m_cond.wait(lock);
+   }
+   --m_count;
+}
+
+inline bool interprocess_semaphore::try_wait()
+{
+   scoped_lock<interprocess_mutex> lock(m_mut);
+   if(m_count == 0){
+      return false;
+   }
+   --m_count;
+   return true;
+}
+
+inline bool interprocess_semaphore::timed_wait(const boost::posix_time::ptime &abs_time)
+{
+   if(abs_time == boost::posix_time::pos_infin){
+      this->wait();
+      return true;
+   }
+   scoped_lock<interprocess_mutex> lock(m_mut);
+   while(m_count == 0){
+      if(!m_cond.timed_wait(lock, abs_time))
+         return m_count != 0;
+   }
+   --m_count;
+   return true;
+}
+/*
+inline int interprocess_semaphore::get_count() const
+{
+   scoped_lock<interprocess_mutex> lock(m_mut);
+   return count;   
+}*/
+
+}  //namespace interprocess {
+}  //namespace boost {