#include "btree.h"
int btlock(BTA* btact);
The btlock function enables a process to
gain exclusive access to a B Tree file, originally opened in
shared mode. btlock is passed
btact, which holds the context pointer
of the file for which exclusive access is required.
btlock will return zero on success, error
code otherwise. Applications should be ready to handle a
QBUSY error return, indicating that exclusive access could not
be gained. btlock waits for ZSLEEP
seconds before giving up the attempt to gain exclusive access.
ZSLEEP is an implementation defined constant. The default is
five seconds.
