File Lock Types
[File I/O Handling Functions]

Defines
#define	APR_FLOCK_SHARED
#define	APR_FLOCK_EXCLUSIVE
#define	APR_FLOCK_TYPEMASK   0x000F /**< mask to extract lock type */
#define	APR_FLOCK_NONBLOCK

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Define Documentation

#define APR_FLOCK_EXCLUSIVE

Value: 2 Exclusive lock. Only one process may hold an exclusive lock at any given time. This is analogous to a "write lock".

#define APR_FLOCK_NONBLOCK

Value: 0x0010 do not block while acquiring the file lock

#define APR_FLOCK_SHARED

Value: 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.

#define APR_FLOCK_TYPEMASK   0x000F /**< mask to extract lock type */

mask to extract lock type

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