Collaboration diagram for File Lock Types:

Macros
#define	APR_FLOCK_SHARED 1

#define	APR_FLOCK_EXCLUSIVE 2

#define	APR_FLOCK_TYPEMASK 0x000F

#define	APR_FLOCK_NONBLOCK 0x0010

Detailed Description

Macro Definition Documentation

◆ APR_FLOCK_EXCLUSIVE

#define APR_FLOCK_EXCLUSIVE 2

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

◆ APR_FLOCK_NONBLOCK

#define APR_FLOCK_NONBLOCK 0x0010

do not block while acquiring the file lock

◆ APR_FLOCK_SHARED

#define APR_FLOCK_SHARED 1

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.

◆ APR_FLOCK_TYPEMASK

#define APR_FLOCK_TYPEMASK 0x000F