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stxxl::mem_file Class Reference

Detailed Description

Implementation of file based on new[] and memcpy.

Definition at line 27 of file mem_file.h.

+ Inheritance diagram for stxxl::mem_file:
+ Collaboration diagram for stxxl::mem_file:

Public Member Functions

 mem_file (int queue_id=DEFAULT_QUEUE, int allocator_id=NO_ALLOCATOR, unsigned int device_id=DEFAULT_DEVICE_ID)
 constructs file object. More...
 
 ~mem_file ()
 
void discard (offset_type offset, offset_type size)
 
const char * io_type () const
 Identifies the type of I/O implementation. More...
 
void lock ()
 Locks file for reading and writing (acquires a lock in the file system). More...
 
void serve (void *buffer, offset_type offset, size_type bytes, request::request_type type)
 
void set_size (offset_type newsize)
 
offset_type size ()
 Returns size of the file. More...
 
- Public Member Functions inherited from stxxl::disk_queued_file
 disk_queued_file (int queue_id, int allocator_id)
 
request_ptr aread (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl=completion_handler())
 
request_ptr awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl=completion_handler())
 
virtual int get_allocator_id () const
 Returns the file's disk allocator number. More...
 
virtual int get_queue_id () const
 Returns the identifier of the file's queue number. More...
 
- Public Member Functions inherited from stxxl::file
 file (unsigned int device_id=DEFAULT_DEVICE_ID)
 Construct a new file, usually called by a subclass. More...
 
virtual ~file ()
 
void add_request_ref ()
 increment referenced requests More...
 
virtual request_ptr aread (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl=completion_handler())=0
 Schedules an asynchronous read request to the file. More...
 
virtual request_ptr awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl=completion_handler())=0
 Schedules an asynchronous write request to the file. More...
 
virtual void close_remove ()
 close and remove file More...
 
void delete_request_ref ()
 decrement referenced requests More...
 
virtual void discard (offset_type offset, offset_type size)
 Discard a region of the file (mark it unused). Some specialized file types may need to know freed regions. More...
 
virtual void export_files (offset_type offset, offset_type length, std::string prefix)
 
unsigned int get_device_id () const
 Returns the file's physical device id. More...
 
unsigned_type get_request_nref ()
 return number of referenced requests More...
 
virtual void serve (void *buffer, offset_type offset, size_type bytes, request::request_type type)=0
 
virtual void set_size (offset_type newsize)=0
 Changes the size of the file. More...
 

Private Attributes

mutex m_mutex
 sequentialize function calls More...
 
char * m_ptr
 pointer to memory area of "file" More...
 
offset_type m_size
 size of memory area More...
 

Additional Inherited Members

- Public Types inherited from stxxl::file
typedef request::offset_type offset_type
 the offset of a request, also the size of the file More...
 
enum  open_mode {
  RDONLY = 1, WRONLY = 2, RDWR = 4, CREAT = 8,
  DIRECT = 16, TRUNC = 32, SYNC = 64, NO_LOCK = 128,
  REQUIRE_DIRECT = 256
}
 Definition of acceptable file open modes. More...
 
typedef request::size_type size_type
 the size of a request More...
 
- Static Public Member Functions inherited from stxxl::file
static int unlink (const char *path)
 unlink path from filesystem More...
 
static int truncate (const char *path, external_size_type length)
 truncate a path to given length. Use this only if you dont have a fileio-specific object, which provides truncate(). More...
 
- Static Public Attributes inherited from stxxl::file
static const unsigned int DEFAULT_DEVICE_ID = (unsigned int)(-1)
 
static const int DEFAULT_LINUXAIO_QUEUE = -2
 
static const int DEFAULT_QUEUE = -1
 
static const int NO_ALLOCATOR = -1
 
- Protected Attributes inherited from stxxl::file
unsigned int m_device_id
 The file's physical device id (e.g. used for prefetching sequence calculation) More...
 
atomic_counted_object m_request_ref
 count the number of requests referencing this file More...
 

Constructor & Destructor Documentation

stxxl::mem_file::mem_file ( int  queue_id = DEFAULT_QUEUE,
int  allocator_id = NO_ALLOCATOR,
unsigned int  device_id = DEFAULT_DEVICE_ID 
)
inline

constructs file object.

Definition at line 40 of file mem_file.h.

stxxl::mem_file::~mem_file ( )

Definition at line 45 of file mem_file.cpp.

References free().

Member Function Documentation

void stxxl::mem_file::discard ( offset_type  offset,
offset_type  size 
)

Definition at line 70 of file mem_file.cpp.

References free(), malloc(), max(), STXXL_BLOCK_ALIGN, stxxl::STXXL_UNUSED(), and STXXL_VERBOSE.

const char * stxxl::mem_file::io_type ( ) const
virtual

Identifies the type of I/O implementation.

Returns
pointer to null terminated string of characters, containing the name of I/O implementation

Implements stxxl::file.

Definition at line 40 of file mem_file.cpp.

void stxxl::mem_file::lock ( )
virtual

Locks file for reading and writing (acquires a lock in the file system).

Implements stxxl::file.

Definition at line 51 of file mem_file.cpp.

Referenced by stxxl::create_file().

void stxxl::mem_file::serve ( void *  buffer,
offset_type  offset,
size_type  bytes,
request::request_type  type 
)

Definition at line 23 of file mem_file.cpp.

void stxxl::mem_file::set_size ( offset_type  newsize)

Definition at line 61 of file mem_file.cpp.

References max(), and realloc().

file::offset_type stxxl::mem_file::size ( )
virtual

Returns size of the file.

Returns
file size in bytes

Implements stxxl::file.

Definition at line 56 of file mem_file.cpp.

Member Data Documentation

mutex stxxl::mem_file::m_mutex
private

sequentialize function calls

Definition at line 36 of file mem_file.h.

char* stxxl::mem_file::m_ptr
private

pointer to memory area of "file"

Definition at line 30 of file mem_file.h.

offset_type stxxl::mem_file::m_size
private

size of memory area

Definition at line 33 of file mem_file.h.


The documentation for this class was generated from the following files: