The DbTxnMgr::close method detaches a process from the transaction environment specified by the DbTxnMgr object. All mapped regions are unmapped and any allocated resources are freed. Any uncommitted transactions are aborted.
In addition, if the dir argument to DbTxnMgr::open was NULL and dbenv was not initialized using DbEnv::appinit, all files created for this shared region will be removed, as if the DbTxnMgr::unlink method were called.
In multi-threaded applications, only a single thread may call the DbTxnMgr::close method.
The DbTxnMgr::close method either returns errno or throws an exception that encapsulates an errno on failure, and 0 on success.
The DbTxnMgr::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), DbLockTab::vec, DbLog::flush, memset(3), munmap(3), shmctl(3), shmdt(3), strerror(3), strlen(3), DbTxn::abort, unlink(3), vfprintf(3), and vsnprintf(3).