Added shared memory option for the render buffer

libraries/boost/boost/interprocess/allocators/allocator.hpp

@@ -0,0 +1,307 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2005-2012. 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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_INTERPROCESS_ALLOCATOR_HPP
+#define BOOST_INTERPROCESS_ALLOCATOR_HPP
+
+#ifndef BOOST_CONFIG_HPP
+#  include <boost/config.hpp>
+#endif
+#
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#  pragma once
+#endif
+
+#include <boost/interprocess/detail/config_begin.hpp>
+#include <boost/interprocess/detail/workaround.hpp>
+
+#include <boost/intrusive/pointer_traits.hpp>
+
+#include <boost/interprocess/interprocess_fwd.hpp>
+#include <boost/interprocess/containers/allocation_type.hpp>
+#include <boost/container/detail/multiallocation_chain.hpp>
+#include <boost/interprocess/allocators/detail/allocator_common.hpp>
+#include <boost/interprocess/detail/utilities.hpp>
+#include <boost/interprocess/containers/version_type.hpp>
+#include <boost/interprocess/exceptions.hpp>
+#include <boost/assert.hpp>
+#include <boost/utility/addressof.hpp>
+#include <boost/interprocess/detail/type_traits.hpp>
+#include <boost/container/detail/placement_new.hpp>
+
+#include <cstddef>
+#include <stdexcept>
+
+//!\file
+//!Describes an allocator that allocates portions of fixed size
+//!memory buffer (shared memory, mapped file...)
+
+namespace boost {
+namespace interprocess {
+
+
+//!An STL compatible allocator that uses a segment manager as
+//!memory source. The internal pointer type will of the same type (raw, smart) as
+//!"typename SegmentManager::void_pointer" type. This allows
+//!placing the allocator in shared memory, memory mapped-files, etc...
+template<class T, class SegmentManager>
+class allocator
+{
+   public:
+   //Segment manager
+   typedef SegmentManager                                segment_manager;
+   typedef typename SegmentManager::void_pointer         void_pointer;
+
+   #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
+   private:
+
+   //Self type
+   typedef allocator<T, SegmentManager>   self_t;
+
+   //Pointer to void
+   typedef typename segment_manager::void_pointer  aux_pointer_t;
+
+   //Typedef to const void pointer
+   typedef typename boost::intrusive::
+      pointer_traits<aux_pointer_t>::template
+         rebind_pointer<const void>::type          cvoid_ptr;
+
+   //Pointer to the allocator
+   typedef typename boost::intrusive::
+      pointer_traits<cvoid_ptr>::template
+         rebind_pointer<segment_manager>::type          alloc_ptr_t;
+
+   //Not assignable from related allocator
+   template<class T2, class SegmentManager2>
+   allocator& operator=(const allocator<T2, SegmentManager2>&);
+
+   //Not assignable from other allocator
+   allocator& operator=(const allocator&);
+
+   //Pointer to the allocator
+   alloc_ptr_t mp_mngr;
+   #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
+
+   public:
+   typedef T                                    value_type;
+   typedef typename boost::intrusive::
+      pointer_traits<cvoid_ptr>::template
+         rebind_pointer<T>::type                pointer;
+   typedef typename boost::intrusive::
+      pointer_traits<pointer>::template
+         rebind_pointer<const T>::type          const_pointer;
+   typedef typename ipcdetail::add_reference
+                     <value_type>::type         reference;
+   typedef typename ipcdetail::add_reference
+                     <const value_type>::type   const_reference;
+   typedef typename segment_manager::size_type               size_type;
+   typedef typename segment_manager::difference_type         difference_type;
+
+   typedef boost::interprocess::version_type<allocator, 2>   version;
+
+   #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
+
+   //Experimental. Don't use.
+   typedef boost::container::container_detail::transform_multiallocation_chain
+      <typename SegmentManager::multiallocation_chain, T>multiallocation_chain;
+   #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
+
+   //!Obtains an allocator that allocates
+   //!objects of type T2
+   template<class T2>
+   struct rebind
+   {
+      typedef allocator<T2, SegmentManager>     other;
+   };
+
+   //!Returns the segment manager.
+   //!Never throws
+   segment_manager* get_segment_manager()const
+   {  return ipcdetail::to_raw_pointer(mp_mngr);   }
+
+   //!Constructor from the segment manager.
+   //!Never throws
+   allocator(segment_manager *segment_mngr)
+      : mp_mngr(segment_mngr) { }
+
+   //!Constructor from other allocator.
+   //!Never throws
+   allocator(const allocator &other)
+      : mp_mngr(other.get_segment_manager()){ }
+
+   //!Constructor from related allocator.
+   //!Never throws
+   template<class T2>
+   allocator(const allocator<T2, SegmentManager> &other)
+      : mp_mngr(other.get_segment_manager()){}
+
+   //!Allocates memory for an array of count elements.
+   //!Throws boost::interprocess::bad_alloc if there is no enough memory
+   pointer allocate(size_type count, cvoid_ptr hint = 0)
+   {
+      (void)hint;
+      if(size_overflows<sizeof(T)>(count)){
+         throw bad_alloc();
+      }
+      return pointer(static_cast<value_type*>(mp_mngr->allocate(count*sizeof(T))));
+   }
+
+   //!Deallocates memory previously allocated.
+   //!Never throws
+   void deallocate(const pointer &ptr, size_type)
+   {  mp_mngr->deallocate((void*)ipcdetail::to_raw_pointer(ptr));  }
+
+   //!Returns the number of elements that could be allocated.
+   //!Never throws
+   size_type max_size() const
+   {  return mp_mngr->get_size()/sizeof(T);   }
+
+   //!Swap segment manager. Does not throw. If each allocator is placed in
+   //!different memory segments, the result is undefined.
+   friend void swap(self_t &alloc1, self_t &alloc2)
+   {  boost::adl_move_swap(alloc1.mp_mngr, alloc2.mp_mngr);   }
+
+   //!Returns maximum the number of objects the previously allocated memory
+   //!pointed by p can hold. This size only works for memory allocated with
+   //!allocate, allocation_command and allocate_many.
+   size_type size(const pointer &p) const
+   {
+      return (size_type)mp_mngr->size(ipcdetail::to_raw_pointer(p))/sizeof(T);
+   }
+
+   pointer allocation_command(boost::interprocess::allocation_type command,
+                           size_type limit_size, size_type &prefer_in_recvd_out_size, pointer &reuse)
+   {
+      value_type *reuse_raw = ipcdetail::to_raw_pointer(reuse);
+      pointer const p = mp_mngr->allocation_command(command, limit_size, prefer_in_recvd_out_size, reuse_raw);
+      reuse = reuse_raw;
+      return p;
+   }
+
+   //!Allocates many elements of size elem_size in a contiguous block
+   //!of memory. The minimum number to be allocated is min_elements,
+   //!the preferred and maximum number is
+   //!preferred_elements. The number of actually allocated elements is
+   //!will be assigned to received_size. The elements must be deallocated
+   //!with deallocate(...)
+   void allocate_many(size_type elem_size, size_type num_elements, multiallocation_chain &chain)
+   {
+      if(size_overflows<sizeof(T)>(elem_size)){
+         throw bad_alloc();
+      }
+      mp_mngr->allocate_many(elem_size*sizeof(T), num_elements, chain);
+   }
+
+   //!Allocates n_elements elements, each one of size elem_sizes[i]in a
+   //!contiguous block
+   //!of memory. The elements must be deallocated
+   void allocate_many(const size_type *elem_sizes, size_type n_elements, multiallocation_chain &chain)
+   {
+      mp_mngr->allocate_many(elem_sizes, n_elements, sizeof(T), chain);
+   }
+
+   //!Allocates many elements of size elem_size in a contiguous block
+   //!of memory. The minimum number to be allocated is min_elements,
+   //!the preferred and maximum number is
+   //!preferred_elements. The number of actually allocated elements is
+   //!will be assigned to received_size. The elements must be deallocated
+   //!with deallocate(...)
+   void deallocate_many(multiallocation_chain &chain)
+   {  mp_mngr->deallocate_many(chain); }
+
+   //!Allocates just one object. Memory allocated with this function
+   //!must be deallocated only with deallocate_one().
+   //!Throws boost::interprocess::bad_alloc if there is no enough memory
+   pointer allocate_one()
+   {  return this->allocate(1);  }
+
+   //!Allocates many elements of size == 1 in a contiguous block
+   //!of memory. The minimum number to be allocated is min_elements,
+   //!the preferred and maximum number is
+   //!preferred_elements. The number of actually allocated elements is
+   //!will be assigned to received_size. Memory allocated with this function
+   //!must be deallocated only with deallocate_one().
+   void allocate_individual(size_type num_elements, multiallocation_chain &chain)
+   {  this->allocate_many(1, num_elements, chain); }
+
+   //!Deallocates memory previously allocated with allocate_one().
+   //!You should never use deallocate_one to deallocate memory allocated
+   //!with other functions different from allocate_one(). Never throws
+   void deallocate_one(const pointer &p)
+   {  return this->deallocate(p, 1);  }
+
+   //!Allocates many elements of size == 1 in a contiguous block
+   //!of memory. The minimum number to be allocated is min_elements,
+   //!the preferred and maximum number is
+   //!preferred_elements. The number of actually allocated elements is
+   //!will be assigned to received_size. Memory allocated with this function
+   //!must be deallocated only with deallocate_one().
+   void deallocate_individual(multiallocation_chain &chain)
+   {  this->deallocate_many(chain); }
+
+   //!Returns address of mutable object.
+   //!Never throws
+   pointer address(reference value) const
+   {  return pointer(boost::addressof(value));  }
+
+   //!Returns address of non mutable object.
+   //!Never throws
+   const_pointer address(const_reference value) const
+   {  return const_pointer(boost::addressof(value));  }
+
+   //!Constructs an object
+   //!Throws if T's constructor throws
+   //!For backwards compatibility with libraries using C++03 allocators
+   template<class P>
+   void construct(const pointer &ptr, BOOST_FWD_REF(P) p)
+   {  ::new((void*)ipcdetail::to_raw_pointer(ptr), boost_container_new_t()) value_type(::boost::forward<P>(p));  }
+
+   //!Destroys object. Throws if object's
+   //!destructor throws
+   void destroy(const pointer &ptr)
+   {  BOOST_ASSERT(ptr != 0); (*ptr).~value_type();  }
+
+};
+
+//!Equality test for same type
+//!of allocator
+template<class T, class SegmentManager> inline
+bool operator==(const allocator<T , SegmentManager>  &alloc1,
+                const allocator<T, SegmentManager>  &alloc2)
+   {  return alloc1.get_segment_manager() == alloc2.get_segment_manager(); }
+
+//!Inequality test for same type
+//!of allocator
+template<class T, class SegmentManager> inline
+bool operator!=(const allocator<T, SegmentManager>  &alloc1,
+                const allocator<T, SegmentManager>  &alloc2)
+   {  return alloc1.get_segment_manager() != alloc2.get_segment_manager(); }
+
+}  //namespace interprocess {
+
+#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
+
+template<class T>
+struct has_trivial_destructor;
+
+template<class T, class SegmentManager>
+struct has_trivial_destructor
+   <boost::interprocess::allocator <T, SegmentManager> >
+{
+   static const bool value = true;
+};
+#endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
+
+}  //namespace boost {
+
+#include <boost/interprocess/detail/config_end.hpp>
+
+#endif   //BOOST_INTERPROCESS_ALLOCATOR_HPP
+