/usr/include/boost/interprocess
Edit: /usr/include/boost/interprocess/managed_mapped_file.hpp (8685B)
//////////////////////////////////////////////////////////////////////////////
//
// (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_MANAGED_MAPPED_FILE_HPP
#define BOOST_INTERPROCESS_MANAGED_MAPPED_FILE_HPP
#ifndef BOOST_CONFIG_HPP
# include
#endif
#
#if defined(BOOST_HAS_PRAGMA_ONCE)
# pragma once
#endif
#include
#include
#include
#include
#include
#include
#include
#include
#include
//These includes needed to fulfill default template parameters of
//predeclarations in interprocess_fwd.hpp
#include
#include
#include
namespace boost {
namespace interprocess {
namespace ipcdetail {
template
struct mfile_open_or_create
{
typedef ipcdetail::managed_open_or_create_impl
< file_wrapper, AllocationAlgorithm::Alignment, true, false> type;
};
} //namespace ipcdetail {
//!A basic mapped file named object creation class. Initializes the
//!mapped file. Inherits all basic functionality from
//!basic_managed_memory_impl
template
<
class CharType,
class AllocationAlgorithm,
template class IndexType
>
class basic_managed_mapped_file
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
: public ipcdetail::basic_managed_memory_impl
::type::ManagedOpenOrCreateUserOffset>
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
{
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
public:
typedef ipcdetail::basic_managed_memory_impl
::type::ManagedOpenOrCreateUserOffset> base_t;
typedef ipcdetail::file_wrapper device_type;
private:
typedef ipcdetail::create_open_func create_open_func_t;
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)
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
public: //functions
//!Unsigned integral type enough to represent
//!the size of a basic_managed_mapped_file.
typedef typename BOOST_INTERPROCESS_IMPDEF(base_t::size_type) size_type;
//!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, 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,
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, 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
(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
(filename);
}
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
//!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
std::pair find (char_ptr_holder_t name)
{
if(m_mfile.get_mapped_region().get_mode() == read_only){
return base_t::template find_no_lock(name);
}
else{
return base_t::template find(name);
}
}
private:
typename ipcdetail::mfile_open_or_create::type m_mfile;
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
};
#ifdef BOOST_INTERPROCESS_DOXYGEN_INVOKED
//!Typedef for a default basic_managed_mapped_file
//!of narrow characters
typedef basic_managed_mapped_file
,iset_index>
managed_mapped_file;
//!Typedef for a default basic_managed_mapped_file
//!of wide characters
typedef basic_managed_mapped_file
,iset_index>
wmanaged_mapped_file;
#endif //#ifdef BOOST_INTERPROCESS_DOXYGEN_INVOKED
} //namespace interprocess {
} //namespace boost {
#include
#endif //BOOST_INTERPROCESS_MANAGED_MAPPED_FILE_HPP