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authorAnas Nashif <anas.nashif@intel.com>2012-10-30 19:57:26 (GMT)
committerAnas Nashif <anas.nashif@intel.com>2012-10-30 19:57:26 (GMT)
commit1a78a62555be32868418fe52f8e330c9d0f95d5a (patch)
treed3765a80e7d3b9640ec2e930743630cd6b9fce2b /boost/interprocess/managed_shared_memory.hpp
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Imported Upstream version 1.49.0upstream/1.49.0
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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.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_INTERPROCESS_MANAGED_SHARED_MEMORY_HPP
+#define BOOST_INTERPROCESS_MANAGED_SHARED_MEMORY_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/managed_memory_impl.hpp>
+#include <boost/interprocess/detail/managed_open_or_create_impl.hpp>
+#include <boost/interprocess/shared_memory_object.hpp>
+#include <boost/interprocess/creation_tags.hpp>
+#include <boost/interprocess/permissions.hpp>
+//These includes needed to fulfill default template parameters of
+//predeclarations in interprocess_fwd.hpp
+#include <boost/interprocess/mem_algo/rbtree_best_fit.hpp>
+#include <boost/interprocess/sync/mutex_family.hpp>
+
+namespace boost {
+
+namespace interprocess {
+
+//!A basic shared memory named object creation class. Initializes the
+//!shared memory segment. Inherits all basic functionality from
+//!basic_managed_memory_impl<CharType, AllocationAlgorithm, IndexType>*/
+template
+ <
+ class CharType,
+ class AllocationAlgorithm,
+ template<class IndexConfig> class IndexType
+ >
+class basic_managed_shared_memory
+ : public ipcdetail::basic_managed_memory_impl
+ <CharType, AllocationAlgorithm, IndexType
+ ,ipcdetail::managed_open_or_create_impl<shared_memory_object
+ , AllocationAlgorithm::Alignment>::ManagedOpenOrCreateUserOffset>
+ , private ipcdetail::managed_open_or_create_impl<shared_memory_object
+ , AllocationAlgorithm::Alignment>
+{
+ /// @cond
+ typedef ipcdetail::basic_managed_memory_impl
+ <CharType, AllocationAlgorithm, IndexType,
+ ipcdetail::managed_open_or_create_impl
+ < shared_memory_object, AllocationAlgorithm::Alignment>::ManagedOpenOrCreateUserOffset> base_t;
+ typedef ipcdetail::managed_open_or_create_impl
+ <shared_memory_object, AllocationAlgorithm::Alignment> base2_t;
+
+ typedef ipcdetail::create_open_func<base_t> create_open_func_t;
+
+ basic_managed_shared_memory *get_this_pointer()
+ { return this; }
+
+ public:
+ typedef shared_memory_object device_type;
+ typedef typename base_t::size_type size_type;
+
+ private:
+ typedef typename base_t::char_ptr_holder_t char_ptr_holder_t;
+ BOOST_MOVABLE_BUT_NOT_COPYABLE(basic_managed_shared_memory)
+ /// @endcond
+
+ public: //functions
+
+ //!Destroys *this and indicates that the calling process is finished using
+ //!the resource. The destructor function will deallocate
+ //!any system resources allocated by the system for use by this process for
+ //!this resource. The resource can still be opened again calling
+ //!the open constructor overload. To erase the resource from the system
+ //!use remove().
+ ~basic_managed_shared_memory()
+ {}
+
+ //!Default constructor. Does nothing.
+ //!Useful in combination with move semantics
+ basic_managed_shared_memory()
+ {}
+
+ //!Creates shared memory and creates and places the segment manager.
+ //!This can throw.
+ basic_managed_shared_memory(create_only_t create_only, const char *name,
+ size_type size, const void *addr = 0, const permissions& perm = permissions())
+ : base_t()
+ , base2_t(create_only, name, size, read_write, addr,
+ create_open_func_t(get_this_pointer(), ipcdetail::DoCreate), perm)
+ {}
+
+ //!Creates shared memory and creates and places the segment manager if
+ //!segment was not created. If segment was created it connects to the
+ //!segment.
+ //!This can throw.
+ basic_managed_shared_memory (open_or_create_t open_or_create,
+ const char *name, size_type size,
+ const void *addr = 0, const permissions& perm = permissions())
+ : base_t()
+ , base2_t(open_or_create, name, size, read_write, addr,
+ create_open_func_t(get_this_pointer(),
+ ipcdetail::DoOpenOrCreate), perm)
+ {}
+
+ //!Connects to a created shared memory and its segment manager.
+ //!in copy_on_write mode.
+ //!This can throw.
+ basic_managed_shared_memory (open_copy_on_write_t, const char* name,
+ const void *addr = 0)
+ : base_t()
+ , base2_t(open_only, name, copy_on_write, addr,
+ create_open_func_t(get_this_pointer(),
+ ipcdetail::DoOpen))
+ {}
+
+ //!Connects to a created shared memory and its segment manager.
+ //!in read-only mode.
+ //!This can throw.
+ basic_managed_shared_memory (open_read_only_t, const char* name,
+ const void *addr = 0)
+ : base_t()
+ , base2_t(open_only, name, read_only, addr,
+ create_open_func_t(get_this_pointer(),
+ ipcdetail::DoOpen))
+ {}
+
+ //!Connects to a created shared memory and its segment manager.
+ //!This can throw.
+ basic_managed_shared_memory (open_only_t open_only, const char* name,
+ const void *addr = 0)
+ : base_t()
+ , base2_t(open_only, name, read_write, addr,
+ create_open_func_t(get_this_pointer(),
+ ipcdetail::DoOpen))
+ {}
+
+ //!Moves the ownership of "moved"'s managed memory to *this.
+ //!Does not throw
+ basic_managed_shared_memory(BOOST_RV_REF(basic_managed_shared_memory) moved)
+ {
+ basic_managed_shared_memory tmp;
+ this->swap(moved);
+ tmp.swap(moved);
+ }
+
+ //!Moves the ownership of "moved"'s managed memory to *this.
+ //!Does not throw
+ basic_managed_shared_memory &operator=(BOOST_RV_REF(basic_managed_shared_memory) moved)
+ {
+ basic_managed_shared_memory tmp(boost::move(moved));
+ this->swap(tmp);
+ return *this;
+ }
+
+ //!Swaps the ownership of the managed shared memories managed by *this and other.
+ //!Never throws.
+ void swap(basic_managed_shared_memory &other)
+ {
+ base_t::swap(other);
+ base2_t::swap(other);
+ }
+
+ //!Tries to resize the managed shared memory object so that we have
+ //!room for more objects.
+ //!
+ //!This function is not synchronized so no other thread or process should
+ //!be reading or writing the file
+ static bool grow(const char *shmname, size_type extra_bytes)
+ {
+ return base_t::template grow
+ <basic_managed_shared_memory>(shmname, extra_bytes);
+ }
+
+ //!Tries to resize the managed shared memory to minimized the size of the file.
+ //!
+ //!This function is not synchronized so no other thread or process should
+ //!be reading or writing the file
+ static bool shrink_to_fit(const char *shmname)
+ {
+ return base_t::template shrink_to_fit
+ <basic_managed_shared_memory>(shmname);
+ }
+
+ bool flush()
+ {
+ return this->base2_t::flush();
+ }
+
+ /// @cond
+
+ //!Tries to find a previous named allocation address. Returns a memory
+ //!buffer and the object count. If not found returned pointer is 0.
+ //!Never throws.
+ template <class T>
+ std::pair<T*, size_type> find (char_ptr_holder_t name)
+ {
+ if(base2_t::get_mapped_region().get_mode() == read_only){
+ return base_t::template find_no_lock<T>(name);
+ }
+ else{
+ return base_t::template find<T>(name);
+ }
+ }
+
+ /// @endcond
+};
+
+} //namespace interprocess {
+} //namespace boost {
+
+#include <boost/interprocess/detail/config_end.hpp>
+
+#endif //BOOST_INTERPROCESS_MANAGED_SHARED_MEMORY_HPP
+