ost::ThreadFile - This class defines a database I/O file service that can be shared by multiple threads.

       Generated automatically by Doxygen for GNU CommonC++ from the source code.

GNU CommonC++                                    Sun Dec 27 2020                              ost::ThreadFile(3)

ost::ThreadFile::ThreadFile(constchar*path)
       Open or create a new database file. You should also use Initial.

       Parameterspath pathname of database to open.

   virtualost::ThreadFile::~ThreadFile()[virtual]
       Close and finish a database file.

       This class defines a database I/O file service that can be shared by multiple threads.

       All threads access a global copy of the database object, and mutex locks can be used to preserve
       transaction integrety. pread/pwrite calls can be used for optimized I/O when supported.

       ThreadFile is meant for use by a threaded database server where multiple threads may each perform semi-
       independent operations on a given database table stored on disk. A special 'fcb' structure is used to
       hold file 'state', and pread/pwrite is used whenever possible for optimized I/O. On systems that do not
       offer pwread/pwrite, a Mutex lock is used to protect concurrent lseek and read/write operations.
       ThreadFile managed databases are assumed to be used only by the local server and through a single file
       descriptor.

       Author
           David Sugar dyfet@ostel.com

       This class defines a database I/O file service that can be shared by multiple threads.

Errorost::ThreadFile::append(caddr_taddress=NULL,ccxx_size_tlength=0)
       Add new data to the end of the file.

       Parametersaddress address to use, or NULL if same as last I/O.
           length length to use, or 0 if same as last I/O.

   Errorost::ThreadFile::fetch(caddr_taddress=NULL,ccxx_size_tlength=0,off_tposition=-1)
       Fetch a portion of the file into physical memory. This can use state information to fetch the current
       record multiple times.

       Returns
           errSuccess on success.

       Parametersaddress address to use, or NULL if same as last I/O.
           length length to use, or 0 if same as last I/O.
           position file position to use -1 if same as last I/O.

   off_tost::ThreadFile::getPosition(void)
       Fetch the current file position marker for this thread.

       Returns
           file position offset.

   boolost::ThreadFile::operator++(void)boolost::ThreadFile::operator--(void)Errorost::ThreadFile::restart(void)[virtual]
       Restart an existing database; close and re-open.

       Returns
           errSuccess if successful.

       Reimplemented from ost::RandomFile.

   Errorost::ThreadFile::update(caddr_taddress=NULL,ccxx_size_tlength=0,off_tposition=-1)
       Update a portion of a file from physical memory. This can use state information to commit the last read
       record.

       Returns
           errSuccess on success.

       Parametersaddress address to use, or NULL if same as last I/O.
           length length to use, or 0 if same as last I/O.
           position file position to use or -1 if same as last I/O.

       ost::ThreadFile - This class defines a database I/O file service that can be shared by multiple threads.

       #include <file.h>

       Inherits ost::RandomFile.

   PublicMemberFunctionsThreadFile (const char *path)
           Open or create a new database file.
       virtual ~ThreadFile ()
           Close and finish a database file.
       Errorrestart (void)
           Restart an existing database; close and re-open.
       Errorfetch (caddr_t address=NULL, ccxx_size_t length=0, off_t position=-1)
           Fetch a portion of the file into physical memory.
       Errorupdate (caddr_t address=NULL, ccxx_size_t length=0, off_t position=-1)
           Update a portion of a file from physical memory.
       Errorappend (caddr_t address=NULL, ccxx_size_t length=0)
           Add new data to the end of the file.
       off_t getPosition (void)
           Fetch the current file position marker for this thread.
       bool operator++ (void)
       bool operator-- (void)

   AdditionalInheritedMembers