sdbm_lock.c File Reference

#include "apr_file_info.h"
#include "apr_file_io.h"
#include "apr_sdbm.h"
#include "sdbm_private.h"
#include "sdbm_tune.h"

Go to the source code of this file.

Functions
	APU_DECLARE (apr_status_t)

Function Documentation

APU_DECLARE()

APU_DECLARE

(

int

)

Most DBM libraries take a POSIX mode for creating files. Don't trust the mode_t type, some platforms may not support it, int is safe.

< mask to extract lock type

< Shared lock. More than one process or thread can hold a shared lock at any given time. Essentially, this is a "read lock", preventing writers from establishing an exclusive lock.

< Exclusive lock. Only one process may hold an exclusive lock at any given time. This is analogous to a "write lock".

< Exclusive lock. Only one process may hold an exclusive lock at any given time. This is analogous to a "write lock".

< Size of the file

< Shared lock. More than one process or thread can hold a shared lock at any given time. Essentially, this is a "read lock", preventing writers from establishing an exclusive lock.

< Exclusive lock. Only one process may hold an exclusive lock at any given time. This is analogous to a "write lock".

Definition at line 25 of file sdbm_lock.c.