Berkeley DB: DbLockTab::close
Полезная информация


#include <db_cxx.h>

int DbLockTab::close();


The DbLockTab::close method closes the lock table.

The DbLockTab::close method does not release any locks still held by the closing process, providing functionality for long-lived locks. Processes that wish to have all their locks released can do so by issuing the appropriate DbLockTab::vec call.

In addition, if the dir argument to DbLockTab::open was NULL and dbenv was not initialized using DbEnv::appinit, all files created for this shared region will be removed, as if the DbLockTab::unlink method were called.

In multi-threaded applications, only a single thread may call the DbLockTab::close method.

The DbLockTab::close method either returns errno or throws an exception that encapsulates an errno on failure, and 0 on success.


If a fatal error occurs in Berkeley DB, the DbLockTab::close method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, at which point all subsequent database calls will also fail in the same way. Methods marked as returning errno will, by default, throw an exception that encapsulates the error information. The default error behavior can be changed, see DbException.

The DbLockTab::close method may fail and throw an exception for any of the errors specified for the following Berkeley DB and C library functions: abort(3), close(3), fcntl(3), fflush(3), fprintf(3), free(3), getpid(3), memset(3), munmap(3), shmctl(3), shmdt(3), strlen(3), unlink(3), vfprintf(3), and vsnprintf(3).



See Also

DbLockTab::close, DbLockTab::detect, DbLockTab::get, DbLockTab::id, DbLockTab::open, DbLockTab::stat DbLockTab::unlink and DbLockTab::vec.