Implementation of memory mapped access file.
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#include <mmap_file.h>
List of all members.
Public Member Functions |
| mmap_file (const std::string &filename, int mode, int queue_id=DEFAULT_QUEUE, int allocator_id=NO_ALLOCATOR) |
| constructs file object
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void | serve (const request *req) throw (io_error) |
const char * | io_type () const |
| Identifies the type of I/O implementation.
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offset_type | size () |
| Returns size of the file.
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void | set_size (offset_type newsize) |
| Changes the size of the file.
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void | lock () |
| Locks file for reading and writing (acquires a lock in the file system)
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void | remove () |
void | add_request_ref () |
void | delete_request_ref () |
int | get_request_nref () |
virtual int | get_physical_device_id () const |
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.
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virtual void | export_files (offset_type offset, offset_type length, std::string prefix) |
| 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) |
| Schedules an asynchronous read request to the file.
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request_ptr | awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl) |
| Schedules an asynchronous write request to the file.
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virtual int | get_queue_id () const |
| Returns the identifier of the file's queue.
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virtual int | get_allocator_id () const |
| Returns the file's allocator.
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Additional Inherited Members |
| ufs_file_base (const std::string &filename, int mode) |
offset_type | _size () |
void | close () |
| file () |
| Initializes file object.
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mutex | fd_mutex |
int | file_des |
int | mode_ |
const std::string | filename |
Detailed Description
Implementation of memory mapped access file.
Constructor & Destructor Documentation
mmap_file::mmap_file |
( |
const std::string & |
filename, |
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int |
mode, |
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int |
queue_id = DEFAULT_QUEUE , |
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int |
allocator_id = NO_ALLOCATOR |
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) |
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inline |
constructs file object
- Parameters:
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filename | path of file |
mode | open mode, see stxxl::file::open_modes |
disk | disk(file) identifier |
Member Function Documentation
const char* mmap_file::io_type |
( |
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const |
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virtual |
Identifies the type of I/O implementation.
- Returns:
- pointer to null terminated string of characters, containing the name of I/O implementation
Reimplemented from ufs_file_base.
The documentation for this class was generated from the following file: