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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_MAPPED_FILE_HPP
#define BOOST_INTERPROCESS_MANAGED_MAPPED_FILE_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_open_or_create_impl.hpp>
#include <boost/interprocess/detail/managed_memory_impl.hpp>
#include <boost/interprocess/creation_tags.hpp>
#include <boost/interprocess/detail/file_wrapper.hpp>
#include <boost/move/move.hpp>
#include <boost/interprocess/file_mapping.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>
#include <boost/interprocess/indexes/iset_index.hpp>
namespace boost {
namespace interprocess {
//!A basic mapped file named object creation class. Initializes the
//!mapped file. 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_mapped_file
: public ipcdetail::basic_managed_memory_impl
<CharType, AllocationAlgorithm, IndexType
,ipcdetail::managed_open_or_create_impl< ipcdetail::file_wrapper
, AllocationAlgorithm::Alignment>::ManagedOpenOrCreateUserOffset
>
{
/// @cond
public:
typedef ipcdetail::basic_managed_memory_impl
<CharType, AllocationAlgorithm, IndexType,
ipcdetail::managed_open_or_create_impl
<ipcdetail::file_wrapper, AllocationAlgorithm::Alignment>::ManagedOpenOrCreateUserOffset
> base_t;
typedef ipcdetail::file_wrapper device_type;
typedef typename base_t::size_type size_type;
private:
typedef ipcdetail::create_open_func<base_t> create_open_func_t;
typedef ipcdetail::managed_open_or_create_impl< ipcdetail::file_wrapper
, AllocationAlgorithm::Alignment> managed_open_or_create_type;
basic_managed_mapped_file *get_this_pointer()
{ return this; }
private:
typedef typename base_t::char_ptr_holder_t char_ptr_holder_t;
BOOST_MOVABLE_BUT_NOT_COPYABLE(basic_managed_mapped_file)
/// @endcond
public: //functions
//!Creates mapped file and creates and places the segment manager.
//!This can throw.
basic_managed_mapped_file()
{}
//!Creates mapped file and creates and places the segment manager.
//!This can throw.
basic_managed_mapped_file(create_only_t create_only, const char *name,
size_type size, const void *addr = 0, const permissions &perm = permissions())
: m_mfile(create_only, name, size, read_write, addr,
create_open_func_t(get_this_pointer(), ipcdetail::DoCreate), perm)
{}
//!Creates mapped file 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_mapped_file (open_or_create_t open_or_create,
const char *name, size_type size,
const void *addr = 0, const permissions &perm = permissions())
: m_mfile(open_or_create, name, size, read_write, addr,
create_open_func_t(get_this_pointer(),
ipcdetail::DoOpenOrCreate), perm)
{}
//!Connects to a created mapped file and its segment manager.
//!This can throw.
basic_managed_mapped_file (open_only_t open_only, const char* name,
const void *addr = 0)
: m_mfile(open_only, name, read_write, addr,
create_open_func_t(get_this_pointer(),
ipcdetail::DoOpen))
{}
//!Connects to a created mapped file and its segment manager
//!in copy_on_write mode.
//!This can throw.
basic_managed_mapped_file (open_copy_on_write_t, const char* name,
const void *addr = 0)
: m_mfile(open_only, name, copy_on_write, addr,
create_open_func_t(get_this_pointer(),
ipcdetail::DoOpen))
{}
//!Connects to a created mapped file and its segment manager
//!in read-only mode.
//!This can throw.
basic_managed_mapped_file (open_read_only_t, const char* name,
const void *addr = 0)
: m_mfile(open_only, name, read_only, 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_mapped_file(BOOST_RV_REF(basic_managed_mapped_file) moved)
{
this->swap(moved);
}
//!Moves the ownership of "moved"'s managed memory to *this.
//!Does not throw
basic_managed_mapped_file &operator=(BOOST_RV_REF(basic_managed_mapped_file) moved)
{
basic_managed_mapped_file tmp(boost::move(moved));
this->swap(tmp);
return *this;
}
//!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_mapped_file()
{}
//!Swaps the ownership of the managed mapped memories managed by *this and other.
//!Never throws.
void swap(basic_managed_mapped_file &other)
{
base_t::swap(other);
m_mfile.swap(other.m_mfile);
}
//!Flushes cached data to file.
//!Never throws
bool flush()
{ return m_mfile.flush(); }
//!Tries to resize mapped file 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 *filename, size_type extra_bytes)
{
return base_t::template grow
<basic_managed_mapped_file>(filename, extra_bytes);
}
//!Tries to resize mapped file 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 *filename)
{
return base_t::template shrink_to_fit
<basic_managed_mapped_file>(filename);
}
/// @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(m_mfile.get_mapped_region().get_mode() == read_only){
return base_t::template find_no_lock<T>(name);
}
else{
return base_t::template find<T>(name);
}
}
private:
managed_open_or_create_type m_mfile;
/// @endcond
};
} //namespace interprocess {
} //namespace boost {
#include <boost/interprocess/detail/config_end.hpp>
#endif //BOOST_INTERPROCESS_MANAGED_MAPPED_FILE_HPP
|
