924 lines
32 KiB
Plaintext
924 lines
32 KiB
Plaintext
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTERPROCESS_MAPPED_REGION_HPP
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#define BOOST_INTERPROCESS_MAPPED_REGION_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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#include <boost/interprocess/interprocess_fwd.hpp>
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#include <boost/interprocess/exceptions.hpp>
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#include <boost/move/utility_core.hpp>
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#include <boost/interprocess/detail/utilities.hpp>
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#include <boost/interprocess/detail/os_file_functions.hpp>
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#include <string>
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#include <boost/cstdint.hpp>
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#include <boost/assert.hpp>
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#include <boost/move/adl_move_swap.hpp>
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//Some Unixes use caddr_t instead of void * in madvise
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// SunOS Tru64 HP-UX AIX
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#if defined(sun) || defined(__sun) || defined(__osf__) || defined(__osf) || defined(_hpux) || defined(hpux) || defined(_AIX)
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#define BOOST_INTERPROCESS_MADVISE_USES_CADDR_T
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#include <sys/types.h>
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#endif
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//A lot of UNIXes have destructive semantics for MADV_DONTNEED, so
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//we need to be careful to allow it.
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#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
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#define BOOST_INTERPROCESS_MADV_DONTNEED_HAS_NONDESTRUCTIVE_SEMANTICS
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#endif
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#if defined (BOOST_INTERPROCESS_WINDOWS)
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# include <boost/interprocess/detail/win32_api.hpp>
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# include <boost/interprocess/sync/windows/sync_utils.hpp>
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#else
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# ifdef BOOST_HAS_UNISTD_H
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# include <fcntl.h>
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# include <sys/mman.h> //mmap
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# include <unistd.h>
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# include <sys/stat.h>
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# include <sys/types.h>
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# if defined(BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS)
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# include <sys/shm.h> //System V shared memory...
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# endif
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# include <boost/assert.hpp>
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# else
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# error Unknown platform
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# endif
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#endif //#if defined (BOOST_INTERPROCESS_WINDOWS)
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//!\file
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//!Describes mapped region class
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namespace boost {
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namespace interprocess {
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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//Solaris declares madvise only in some configurations but defines MADV_XXX, a bit confusing.
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//Predeclare it here to avoid any compilation error
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#if (defined(sun) || defined(__sun)) && defined(MADV_NORMAL)
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extern "C" int madvise(caddr_t, size_t, int);
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#endif
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namespace ipcdetail{ class interprocess_tester; }
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namespace ipcdetail{ class raw_mapped_region_creator; }
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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//!The mapped_region class represents a portion or region created from a
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//!memory_mappable object.
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//!
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//!The OS can map a region bigger than the requested one, as region must
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//!be multiple of the page size, but mapped_region will always refer to
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//!the region specified by the user.
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class mapped_region
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{
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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//Non-copyable
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BOOST_MOVABLE_BUT_NOT_COPYABLE(mapped_region)
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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public:
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//!Creates a mapping region of the mapped memory "mapping", starting in
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//!offset "offset", and the mapping's size will be "size". The mapping
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//!can be opened for read only, read-write or copy-on-write.
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//!
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//!If an address is specified, both the offset and the address must be
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//!multiples of the page size.
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//!
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//!The map is created using "default_map_options". This flag is OS
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//!dependant and it should not be changed unless the user needs to
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//!specify special options.
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//!
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//!In Windows systems "map_options" is a DWORD value passed as
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//!"dwDesiredAccess" to "MapViewOfFileEx". If "default_map_options" is passed
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//!it's initialized to zero. "map_options" is XORed with FILE_MAP_[COPY|READ|WRITE].
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//!
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//!In UNIX systems and POSIX mappings "map_options" is an int value passed as "flags"
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//!to "mmap". If "default_map_options" is specified it's initialized to MAP_NOSYNC
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//!if that option exists and to zero otherwise. "map_options" XORed with MAP_PRIVATE or MAP_SHARED.
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//!
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//!In UNIX systems and XSI mappings "map_options" is an int value passed as "shmflg"
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//!to "shmat". If "default_map_options" is specified it's initialized to zero.
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//!"map_options" is XORed with SHM_RDONLY if needed.
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//!
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//!The OS could allocate more pages than size/page_size(), but get_address()
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//!will always return the address passed in this function (if not null) and
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//!get_size() will return the specified size.
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template<class MemoryMappable>
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mapped_region(const MemoryMappable& mapping
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,mode_t mode
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,offset_t offset = 0
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,std::size_t size = 0
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,const void *address = 0
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,map_options_t map_options = default_map_options);
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//!Default constructor. Address will be 0 (nullptr).
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//!Size will be 0.
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//!Does not throw
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mapped_region();
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//!Move constructor. *this will be constructed taking ownership of "other"'s
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//!region and "other" will be left in default constructor state.
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mapped_region(BOOST_RV_REF(mapped_region) other)
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#if defined (BOOST_INTERPROCESS_WINDOWS)
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: m_base(0), m_size(0)
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, m_page_offset(0)
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, m_mode(read_only)
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, m_file_or_mapping_hnd(ipcdetail::invalid_file())
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#else
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: m_base(0), m_size(0), m_page_offset(0), m_mode(read_only), m_is_xsi(false)
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#endif
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{ this->swap(other); }
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//!Destroys the mapped region.
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//!Does not throw
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~mapped_region();
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//!Move assignment. If *this owns a memory mapped region, it will be
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//!destroyed and it will take ownership of "other"'s memory mapped region.
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mapped_region &operator=(BOOST_RV_REF(mapped_region) other)
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{
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mapped_region tmp(boost::move(other));
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this->swap(tmp);
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return *this;
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}
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//!Swaps the mapped_region with another
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//!mapped region
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void swap(mapped_region &other);
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//!Returns the size of the mapping. Never throws.
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std::size_t get_size() const;
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//!Returns the base address of the mapping.
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//!Never throws.
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void* get_address() const;
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//!Returns the mode of the mapping used to construct the mapped region.
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//!Never throws.
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mode_t get_mode() const;
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//!Flushes to the disk a byte range within the mapped memory.
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//!If 'async' is true, the function will return before flushing operation is completed
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//!If 'async' is false, function will return once data has been written into the underlying
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//!device (i.e., in mapped files OS cached information is written to disk).
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//!Never throws. Returns false if operation could not be performed.
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bool flush(std::size_t mapping_offset = 0, std::size_t numbytes = 0, bool async = true);
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//!Shrinks current mapped region. If after shrinking there is no longer need for a previously
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//!mapped memory page, accessing that page can trigger a segmentation fault.
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//!Depending on the OS, this operation might fail (XSI shared memory), it can decommit storage
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//!and free a portion of the virtual address space (e.g.POSIX) or this
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//!function can release some physical memory wihout freeing any virtual address space(Windows).
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//!Returns true on success. Never throws.
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bool shrink_by(std::size_t bytes, bool from_back = true);
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//!This enum specifies region usage behaviors that an application can specify
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//!to the mapped region implementation.
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enum advice_types{
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//!Specifies that the application has no advice to give on its behavior with respect to
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//!the region. It is the default characteristic if no advice is given for a range of memory.
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advice_normal,
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//!Specifies that the application expects to access the region sequentially from
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//!lower addresses to higher addresses. The implementation can lower the priority of
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//!preceding pages within the region once a page have been accessed.
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advice_sequential,
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//!Specifies that the application expects to access the region in a random order,
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//!and prefetching is likely not advantageous.
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advice_random,
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//!Specifies that the application expects to access the region in the near future.
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//!The implementation can prefetch pages of the region.
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advice_willneed,
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//!Specifies that the application expects that it will not access the region in the near future.
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//!The implementation can unload pages within the range to save system resources.
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advice_dontneed
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};
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//!Advises the implementation on the expected behavior of the application with respect to the data
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//!in the region. The implementation may use this information to optimize handling of the region data.
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//!This function has no effect on the semantics of access to memory in the region, although it may affect
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//!the performance of access.
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//!If the advise type is not known to the implementation, the function returns false. True otherwise.
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bool advise(advice_types advise);
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//!Returns the size of the page. This size is the minimum memory that
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//!will be used by the system when mapping a memory mappable source and
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//!will restrict the address and the offset to map.
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static std::size_t get_page_size();
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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private:
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//!Closes a previously opened memory mapping. Never throws
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void priv_close();
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void* priv_map_address() const;
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std::size_t priv_map_size() const;
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bool priv_flush_param_check(std::size_t mapping_offset, void *&addr, std::size_t &numbytes) const;
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bool priv_shrink_param_check(std::size_t bytes, bool from_back, void *&shrink_page_start, std::size_t &shrink_page_bytes);
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static void priv_size_from_mapping_size
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(offset_t mapping_size, offset_t offset, offset_t page_offset, std::size_t &size);
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static offset_t priv_page_offset_addr_fixup(offset_t page_offset, const void *&addr);
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template<int dummy>
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struct page_size_holder
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{
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static const std::size_t PageSize;
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static std::size_t get_page_size();
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};
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void* m_base;
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std::size_t m_size;
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std::size_t m_page_offset;
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mode_t m_mode;
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#if defined(BOOST_INTERPROCESS_WINDOWS)
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file_handle_t m_file_or_mapping_hnd;
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#else
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bool m_is_xsi;
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#endif
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friend class ipcdetail::interprocess_tester;
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friend class ipcdetail::raw_mapped_region_creator;
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void dont_close_on_destruction();
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#if defined(BOOST_INTERPROCESS_WINDOWS) && !defined(BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION)
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template<int Dummy>
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static void destroy_syncs_in_range(const void *addr, std::size_t size);
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#endif
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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};
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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inline void swap(mapped_region &x, mapped_region &y)
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{ x.swap(y); }
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inline mapped_region::~mapped_region()
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{ this->priv_close(); }
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inline std::size_t mapped_region::get_size() const
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{ return m_size; }
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inline mode_t mapped_region::get_mode() const
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{ return m_mode; }
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inline void* mapped_region::get_address() const
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{ return m_base; }
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inline void* mapped_region::priv_map_address() const
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{ return static_cast<char*>(m_base) - m_page_offset; }
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inline std::size_t mapped_region::priv_map_size() const
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{ return m_size + m_page_offset; }
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inline bool mapped_region::priv_flush_param_check
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(std::size_t mapping_offset, void *&addr, std::size_t &numbytes) const
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{
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//Check some errors
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if(m_base == 0)
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return false;
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if(mapping_offset >= m_size || (mapping_offset + numbytes) > m_size){
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return false;
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}
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//Update flush size if the user does not provide it
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if(numbytes == 0){
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numbytes = m_size - mapping_offset;
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}
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addr = (char*)this->priv_map_address() + mapping_offset;
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numbytes += m_page_offset;
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return true;
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}
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inline bool mapped_region::priv_shrink_param_check
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(std::size_t bytes, bool from_back, void *&shrink_page_start, std::size_t &shrink_page_bytes)
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{
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//Check some errors
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if(m_base == 0 || bytes > m_size){
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return false;
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}
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else if(bytes == m_size){
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this->priv_close();
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return true;
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}
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else{
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const std::size_t page_size = mapped_region::get_page_size();
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if(from_back){
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const std::size_t new_pages = (m_size + m_page_offset - bytes - 1)/page_size + 1;
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shrink_page_start = static_cast<char*>(this->priv_map_address()) + new_pages*page_size;
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shrink_page_bytes = m_page_offset + m_size - new_pages*page_size;
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m_size -= bytes;
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}
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else{
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shrink_page_start = this->priv_map_address();
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m_page_offset += bytes;
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shrink_page_bytes = (m_page_offset/page_size)*page_size;
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m_page_offset = m_page_offset % page_size;
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m_size -= bytes;
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m_base = static_cast<char *>(m_base) + bytes;
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BOOST_ASSERT(shrink_page_bytes%page_size == 0);
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}
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return true;
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}
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}
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inline void mapped_region::priv_size_from_mapping_size
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(offset_t mapping_size, offset_t offset, offset_t page_offset, std::size_t &size)
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{
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//Check if mapping size fits in the user address space
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//as offset_t is the maximum file size and its signed.
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if(mapping_size < offset ||
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boost::uintmax_t(mapping_size - (offset - page_offset)) >
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boost::uintmax_t(std::size_t(-1))){
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error_info err(size_error);
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throw interprocess_exception(err);
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}
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size = static_cast<std::size_t>(mapping_size - (offset - page_offset));
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}
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inline offset_t mapped_region::priv_page_offset_addr_fixup(offset_t offset, const void *&address)
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{
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//We can't map any offset so we have to obtain system's
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//memory granularity
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const std::size_t page_size = mapped_region::get_page_size();
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//We calculate the difference between demanded and valid offset
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//(always less than a page in std::size_t, thus, representable by std::size_t)
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const std::size_t page_offset =
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static_cast<std::size_t>(offset - (offset / page_size) * page_size);
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//Update the mapping address
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if(address){
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address = static_cast<const char*>(address) - page_offset;
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}
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return page_offset;
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}
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#if defined (BOOST_INTERPROCESS_WINDOWS)
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inline mapped_region::mapped_region()
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: m_base(0), m_size(0), m_page_offset(0), m_mode(read_only)
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, m_file_or_mapping_hnd(ipcdetail::invalid_file())
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{}
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template<int dummy>
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inline std::size_t mapped_region::page_size_holder<dummy>::get_page_size()
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{
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winapi::system_info info;
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winapi::get_system_info(&info);
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return std::size_t(info.dwAllocationGranularity);
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}
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template<class MemoryMappable>
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inline mapped_region::mapped_region
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(const MemoryMappable &mapping
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,mode_t mode
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,offset_t offset
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,std::size_t size
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,const void *address
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,map_options_t map_options)
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: m_base(0), m_size(0), m_page_offset(0), m_mode(mode)
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, m_file_or_mapping_hnd(ipcdetail::invalid_file())
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{
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mapping_handle_t mhandle = mapping.get_mapping_handle();
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{
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file_handle_t native_mapping_handle = 0;
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//Set accesses
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//For "create_file_mapping"
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unsigned long protection = 0;
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//For "mapviewoffile"
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unsigned long map_access = map_options == default_map_options ? 0 : map_options;
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switch(mode)
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{
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case read_only:
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case read_private:
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protection |= winapi::page_readonly;
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map_access |= winapi::file_map_read;
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break;
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case read_write:
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protection |= winapi::page_readwrite;
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map_access |= winapi::file_map_write;
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break;
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case copy_on_write:
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protection |= winapi::page_writecopy;
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map_access |= winapi::file_map_copy;
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break;
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default:
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{
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error_info err(mode_error);
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throw interprocess_exception(err);
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}
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break;
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}
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//For file mapping (including emulated shared memory through temporary files),
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//the device is a file handle so we need to obtain file's size and call create_file_mapping
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//to obtain the mapping handle.
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//For files we don't need the file mapping after mapping the memory, as the file is there
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//so we'll program the handle close
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void * handle_to_close = winapi::invalid_handle_value;
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if(!mhandle.is_shm){
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//Create mapping handle
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native_mapping_handle = winapi::create_file_mapping
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( ipcdetail::file_handle_from_mapping_handle(mapping.get_mapping_handle())
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, protection, 0, 0, 0);
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//Check if all is correct
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if(!native_mapping_handle){
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error_info err = winapi::get_last_error();
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throw interprocess_exception(err);
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}
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handle_to_close = native_mapping_handle;
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}
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else{
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//For windows_shared_memory the device handle is already a mapping handle
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//and we need to maintain it
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native_mapping_handle = mhandle.handle;
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}
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//RAII handle close on scope exit
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const winapi::handle_closer close_handle(handle_to_close);
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(void)close_handle;
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const offset_t page_offset = priv_page_offset_addr_fixup(offset, address);
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//Obtain mapping size if user provides 0 size
|
|
if(size == 0){
|
|
offset_t mapping_size;
|
|
if(!winapi::get_file_mapping_size(native_mapping_handle, mapping_size)){
|
|
error_info err = winapi::get_last_error();
|
|
throw interprocess_exception(err);
|
|
}
|
|
//This can throw
|
|
priv_size_from_mapping_size(mapping_size, offset, page_offset, size);
|
|
}
|
|
|
|
//Map with new offsets and size
|
|
void *base = winapi::map_view_of_file_ex
|
|
(native_mapping_handle,
|
|
map_access,
|
|
offset - page_offset,
|
|
static_cast<std::size_t>(page_offset + size),
|
|
const_cast<void*>(address));
|
|
//Check error
|
|
if(!base){
|
|
error_info err = winapi::get_last_error();
|
|
throw interprocess_exception(err);
|
|
}
|
|
|
|
//Calculate new base for the user
|
|
m_base = static_cast<char*>(base) + page_offset;
|
|
m_page_offset = page_offset;
|
|
m_size = size;
|
|
}
|
|
//Windows shared memory needs the duplication of the handle if we want to
|
|
//make mapped_region independent from the mappable device
|
|
//
|
|
//For mapped files, we duplicate the file handle to be able to FlushFileBuffers
|
|
if(!winapi::duplicate_current_process_handle(mhandle.handle, &m_file_or_mapping_hnd)){
|
|
error_info err = winapi::get_last_error();
|
|
this->priv_close();
|
|
throw interprocess_exception(err);
|
|
}
|
|
}
|
|
|
|
inline bool mapped_region::flush(std::size_t mapping_offset, std::size_t numbytes, bool async)
|
|
{
|
|
void *addr;
|
|
if(!this->priv_flush_param_check(mapping_offset, addr, numbytes)){
|
|
return false;
|
|
}
|
|
//Flush it all
|
|
if(!winapi::flush_view_of_file(addr, numbytes)){
|
|
return false;
|
|
}
|
|
//m_file_or_mapping_hnd can be a file handle or a mapping handle.
|
|
//so flushing file buffers has only sense for files...
|
|
else if(!async && m_file_or_mapping_hnd != winapi::invalid_handle_value &&
|
|
winapi::get_file_type(m_file_or_mapping_hnd) == winapi::file_type_disk){
|
|
return winapi::flush_file_buffers(m_file_or_mapping_hnd);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
inline bool mapped_region::shrink_by(std::size_t bytes, bool from_back)
|
|
{
|
|
void *shrink_page_start = 0;
|
|
std::size_t shrink_page_bytes = 0;
|
|
if(!this->priv_shrink_param_check(bytes, from_back, shrink_page_start, shrink_page_bytes)){
|
|
return false;
|
|
}
|
|
else if(shrink_page_bytes){
|
|
//In Windows, we can't decommit the storage or release the virtual address space,
|
|
//the best we can do is try to remove some memory from the process working set.
|
|
//With a bit of luck we can free some physical memory.
|
|
unsigned long old_protect_ignored;
|
|
bool b_ret = winapi::virtual_unlock(shrink_page_start, shrink_page_bytes)
|
|
|| (winapi::get_last_error() == winapi::error_not_locked);
|
|
(void)old_protect_ignored;
|
|
//Change page protection to forbid any further access
|
|
b_ret = b_ret && winapi::virtual_protect
|
|
(shrink_page_start, shrink_page_bytes, winapi::page_noaccess, old_protect_ignored);
|
|
return b_ret;
|
|
}
|
|
else{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
inline bool mapped_region::advise(advice_types)
|
|
{
|
|
//Windows has no madvise/posix_madvise equivalent
|
|
return false;
|
|
}
|
|
|
|
inline void mapped_region::priv_close()
|
|
{
|
|
if(m_base){
|
|
void *addr = this->priv_map_address();
|
|
#if !defined(BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION)
|
|
mapped_region::destroy_syncs_in_range<0>(addr, m_size);
|
|
#endif
|
|
winapi::unmap_view_of_file(addr);
|
|
m_base = 0;
|
|
}
|
|
if(m_file_or_mapping_hnd != ipcdetail::invalid_file()){
|
|
winapi::close_handle(m_file_or_mapping_hnd);
|
|
m_file_or_mapping_hnd = ipcdetail::invalid_file();
|
|
}
|
|
}
|
|
|
|
inline void mapped_region::dont_close_on_destruction()
|
|
{}
|
|
|
|
#else //#if defined (BOOST_INTERPROCESS_WINDOWS)
|
|
|
|
inline mapped_region::mapped_region()
|
|
: m_base(0), m_size(0), m_page_offset(0), m_mode(read_only), m_is_xsi(false)
|
|
{}
|
|
|
|
template<int dummy>
|
|
inline std::size_t mapped_region::page_size_holder<dummy>::get_page_size()
|
|
{ return std::size_t(sysconf(_SC_PAGESIZE)); }
|
|
|
|
template<class MemoryMappable>
|
|
inline mapped_region::mapped_region
|
|
( const MemoryMappable &mapping
|
|
, mode_t mode
|
|
, offset_t offset
|
|
, std::size_t size
|
|
, const void *address
|
|
, map_options_t map_options)
|
|
: m_base(0), m_size(0), m_page_offset(0), m_mode(mode), m_is_xsi(false)
|
|
{
|
|
mapping_handle_t map_hnd = mapping.get_mapping_handle();
|
|
|
|
//Some systems dont' support XSI shared memory
|
|
#ifdef BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS
|
|
if(map_hnd.is_xsi){
|
|
//Get the size
|
|
::shmid_ds xsi_ds;
|
|
int ret = ::shmctl(map_hnd.handle, IPC_STAT, &xsi_ds);
|
|
if(ret == -1){
|
|
error_info err(system_error_code());
|
|
throw interprocess_exception(err);
|
|
}
|
|
//Compare sizess
|
|
if(size == 0){
|
|
size = (std::size_t)xsi_ds.shm_segsz;
|
|
}
|
|
else if(size != (std::size_t)xsi_ds.shm_segsz){
|
|
error_info err(size_error);
|
|
throw interprocess_exception(err);
|
|
}
|
|
//Calculate flag
|
|
int flag = map_options == default_map_options ? 0 : map_options;
|
|
if(m_mode == read_only){
|
|
flag |= SHM_RDONLY;
|
|
}
|
|
else if(m_mode != read_write){
|
|
error_info err(mode_error);
|
|
throw interprocess_exception(err);
|
|
}
|
|
//Attach memory
|
|
//Some old shmat implementation take the address as a non-const void pointer
|
|
//so uncast it to make code portable.
|
|
void *const final_address = const_cast<void *>(address);
|
|
void *base = ::shmat(map_hnd.handle, final_address, flag);
|
|
if(base == (void*)-1){
|
|
error_info err(system_error_code());
|
|
throw interprocess_exception(err);
|
|
}
|
|
//Update members
|
|
m_base = base;
|
|
m_size = size;
|
|
m_mode = mode;
|
|
m_page_offset = 0;
|
|
m_is_xsi = true;
|
|
return;
|
|
}
|
|
#endif //ifdef BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS
|
|
|
|
//We calculate the difference between demanded and valid offset
|
|
const offset_t page_offset = priv_page_offset_addr_fixup(offset, address);
|
|
|
|
if(size == 0){
|
|
struct ::stat buf;
|
|
if(0 != fstat(map_hnd.handle, &buf)){
|
|
error_info err(system_error_code());
|
|
throw interprocess_exception(err);
|
|
}
|
|
//This can throw
|
|
priv_size_from_mapping_size(buf.st_size, offset, page_offset, size);
|
|
}
|
|
|
|
#ifdef MAP_NOSYNC
|
|
#define BOOST_INTERPROCESS_MAP_NOSYNC MAP_NOSYNC
|
|
#else
|
|
#define BOOST_INTERPROCESS_MAP_NOSYNC 0
|
|
#endif //MAP_NOSYNC
|
|
|
|
//Create new mapping
|
|
int prot = 0;
|
|
int flags = map_options == default_map_options ? BOOST_INTERPROCESS_MAP_NOSYNC : map_options;
|
|
|
|
#undef BOOST_INTERPROCESS_MAP_NOSYNC
|
|
|
|
switch(mode)
|
|
{
|
|
case read_only:
|
|
prot |= PROT_READ;
|
|
flags |= MAP_SHARED;
|
|
break;
|
|
|
|
case read_private:
|
|
prot |= (PROT_READ);
|
|
flags |= MAP_PRIVATE;
|
|
break;
|
|
|
|
case read_write:
|
|
prot |= (PROT_WRITE | PROT_READ);
|
|
flags |= MAP_SHARED;
|
|
break;
|
|
|
|
case copy_on_write:
|
|
prot |= (PROT_WRITE | PROT_READ);
|
|
flags |= MAP_PRIVATE;
|
|
break;
|
|
|
|
default:
|
|
{
|
|
error_info err(mode_error);
|
|
throw interprocess_exception(err);
|
|
}
|
|
break;
|
|
}
|
|
|
|
//Map it to the address space
|
|
void* base = mmap ( const_cast<void*>(address)
|
|
, static_cast<std::size_t>(page_offset + size)
|
|
, prot
|
|
, flags
|
|
, mapping.get_mapping_handle().handle
|
|
, offset - page_offset);
|
|
|
|
//Check if mapping was successful
|
|
if(base == MAP_FAILED){
|
|
error_info err = system_error_code();
|
|
throw interprocess_exception(err);
|
|
}
|
|
|
|
//Calculate new base for the user
|
|
m_base = static_cast<char*>(base) + page_offset;
|
|
m_page_offset = page_offset;
|
|
m_size = size;
|
|
|
|
//Check for fixed mapping error
|
|
if(address && (base != address)){
|
|
error_info err(busy_error);
|
|
this->priv_close();
|
|
throw interprocess_exception(err);
|
|
}
|
|
}
|
|
|
|
inline bool mapped_region::shrink_by(std::size_t bytes, bool from_back)
|
|
{
|
|
void *shrink_page_start = 0;
|
|
std::size_t shrink_page_bytes = 0;
|
|
if(m_is_xsi || !this->priv_shrink_param_check(bytes, from_back, shrink_page_start, shrink_page_bytes)){
|
|
return false;
|
|
}
|
|
else if(shrink_page_bytes){
|
|
//In UNIX we can decommit and free virtual address space.
|
|
return 0 == munmap(shrink_page_start, shrink_page_bytes);
|
|
}
|
|
else{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
inline bool mapped_region::flush(std::size_t mapping_offset, std::size_t numbytes, bool async)
|
|
{
|
|
void *addr;
|
|
if(m_is_xsi || !this->priv_flush_param_check(mapping_offset, addr, numbytes)){
|
|
return false;
|
|
}
|
|
//Flush it all
|
|
return msync(addr, numbytes, async ? MS_ASYNC : MS_SYNC) == 0;
|
|
}
|
|
|
|
inline bool mapped_region::advise(advice_types advice)
|
|
{
|
|
int unix_advice = 0;
|
|
//Modes; 0: none, 2: posix, 1: madvise
|
|
const unsigned int mode_none = 0;
|
|
const unsigned int mode_padv = 1;
|
|
const unsigned int mode_madv = 2;
|
|
// Suppress "unused variable" warnings
|
|
(void)mode_padv;
|
|
(void)mode_madv;
|
|
unsigned int mode = mode_none;
|
|
//Choose advice either from POSIX (preferred) or native Unix
|
|
switch(advice){
|
|
case advice_normal:
|
|
#if defined(POSIX_MADV_NORMAL)
|
|
unix_advice = POSIX_MADV_NORMAL;
|
|
mode = mode_padv;
|
|
#elif defined(MADV_NORMAL)
|
|
unix_advice = MADV_NORMAL;
|
|
mode = mode_madv;
|
|
#endif
|
|
break;
|
|
case advice_sequential:
|
|
#if defined(POSIX_MADV_SEQUENTIAL)
|
|
unix_advice = POSIX_MADV_SEQUENTIAL;
|
|
mode = mode_padv;
|
|
#elif defined(MADV_SEQUENTIAL)
|
|
unix_advice = MADV_SEQUENTIAL;
|
|
mode = mode_madv;
|
|
#endif
|
|
break;
|
|
case advice_random:
|
|
#if defined(POSIX_MADV_RANDOM)
|
|
unix_advice = POSIX_MADV_RANDOM;
|
|
mode = mode_padv;
|
|
#elif defined(MADV_RANDOM)
|
|
unix_advice = MADV_RANDOM;
|
|
mode = mode_madv;
|
|
#endif
|
|
break;
|
|
case advice_willneed:
|
|
#if defined(POSIX_MADV_WILLNEED)
|
|
unix_advice = POSIX_MADV_WILLNEED;
|
|
mode = mode_padv;
|
|
#elif defined(MADV_WILLNEED)
|
|
unix_advice = MADV_WILLNEED;
|
|
mode = mode_madv;
|
|
#endif
|
|
break;
|
|
case advice_dontneed:
|
|
#if defined(POSIX_MADV_DONTNEED)
|
|
unix_advice = POSIX_MADV_DONTNEED;
|
|
mode = mode_padv;
|
|
#elif defined(MADV_DONTNEED) && defined(BOOST_INTERPROCESS_MADV_DONTNEED_HAS_NONDESTRUCTIVE_SEMANTICS)
|
|
unix_advice = MADV_DONTNEED;
|
|
mode = mode_madv;
|
|
#endif
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
switch(mode){
|
|
#if defined(POSIX_MADV_NORMAL)
|
|
case mode_padv:
|
|
return 0 == posix_madvise(this->priv_map_address(), this->priv_map_size(), unix_advice);
|
|
#endif
|
|
#if defined(MADV_NORMAL)
|
|
case mode_madv:
|
|
return 0 == madvise(
|
|
#if defined(BOOST_INTERPROCESS_MADVISE_USES_CADDR_T)
|
|
(caddr_t)
|
|
#endif
|
|
this->priv_map_address(), this->priv_map_size(), unix_advice);
|
|
#endif
|
|
default:
|
|
return false;
|
|
|
|
}
|
|
}
|
|
|
|
inline void mapped_region::priv_close()
|
|
{
|
|
if(m_base != 0){
|
|
#ifdef BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS
|
|
if(m_is_xsi){
|
|
int ret = ::shmdt(m_base);
|
|
BOOST_ASSERT(ret == 0);
|
|
(void)ret;
|
|
return;
|
|
}
|
|
#endif //#ifdef BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS
|
|
munmap(this->priv_map_address(), this->priv_map_size());
|
|
m_base = 0;
|
|
}
|
|
}
|
|
|
|
inline void mapped_region::dont_close_on_destruction()
|
|
{ m_base = 0; }
|
|
|
|
#endif //#if defined (BOOST_INTERPROCESS_WINDOWS)
|
|
|
|
template<int dummy>
|
|
const std::size_t mapped_region::page_size_holder<dummy>::PageSize
|
|
= mapped_region::page_size_holder<dummy>::get_page_size();
|
|
|
|
inline std::size_t mapped_region::get_page_size()
|
|
{
|
|
if(!page_size_holder<0>::PageSize)
|
|
return page_size_holder<0>::get_page_size();
|
|
else
|
|
return page_size_holder<0>::PageSize;
|
|
}
|
|
|
|
inline void mapped_region::swap(mapped_region &other)
|
|
{
|
|
::boost::adl_move_swap(this->m_base, other.m_base);
|
|
::boost::adl_move_swap(this->m_size, other.m_size);
|
|
::boost::adl_move_swap(this->m_page_offset, other.m_page_offset);
|
|
::boost::adl_move_swap(this->m_mode, other.m_mode);
|
|
#if defined (BOOST_INTERPROCESS_WINDOWS)
|
|
::boost::adl_move_swap(this->m_file_or_mapping_hnd, other.m_file_or_mapping_hnd);
|
|
#else
|
|
::boost::adl_move_swap(this->m_is_xsi, other.m_is_xsi);
|
|
#endif
|
|
}
|
|
|
|
//!No-op functor
|
|
struct null_mapped_region_function
|
|
{
|
|
bool operator()(void *, std::size_t , bool) const
|
|
{ return true; }
|
|
|
|
static std::size_t get_min_size()
|
|
{ return 0; }
|
|
};
|
|
|
|
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
|
|
|
|
} //namespace interprocess {
|
|
} //namespace boost {
|
|
|
|
#include <boost/interprocess/detail/config_end.hpp>
|
|
|
|
#endif //BOOST_INTERPROCESS_MAPPED_REGION_HPP
|
|
|
|
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
|
|
|
|
#ifndef BOOST_INTERPROCESS_MAPPED_REGION_EXT_HPP
|
|
#define BOOST_INTERPROCESS_MAPPED_REGION_EXT_HPP
|
|
|
|
#if defined(BOOST_INTERPROCESS_WINDOWS) && !defined(BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION)
|
|
# include <boost/interprocess/sync/windows/sync_utils.hpp>
|
|
# include <boost/interprocess/detail/windows_intermodule_singleton.hpp>
|
|
|
|
namespace boost {
|
|
namespace interprocess {
|
|
|
|
template<int Dummy>
|
|
inline void mapped_region::destroy_syncs_in_range(const void *addr, std::size_t size)
|
|
{
|
|
ipcdetail::sync_handles &handles =
|
|
ipcdetail::windows_intermodule_singleton<ipcdetail::sync_handles>::get();
|
|
handles.destroy_syncs_in_range(addr, size);
|
|
}
|
|
|
|
} //namespace interprocess {
|
|
} //namespace boost {
|
|
|
|
#endif //defined(BOOST_INTERPROCESS_WINDOWS) && !defined(BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION)
|
|
|
|
#endif //#ifdef BOOST_INTERPROCESS_MAPPED_REGION_EXT_HPP
|
|
|
|
#endif //#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
|
|
|