Apache Portable Runtime
File Lock Types
File I/O Handling Functions


#define APR_FLOCK_SHARED   1
#define APR_FLOCK_TYPEMASK   0x000F
#define APR_FLOCK_NONBLOCK   0x0010

Define Documentation


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   0x0010

do not block while acquiring the file lock

#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.

#define APR_FLOCK_TYPEMASK   0x000F

mask to extract lock type

 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines