qm_mb_nolock
return qm_mb_nolock(qm, &mailbox, QM_MB_MAX_WAIT_TIMEOUT);
ret = qm_mb_nolock(qm, &mailbox, wait_timeout);
ret = qm_mb_nolock(qm, &mailbox, QM_MB_MAX_WAIT_TIMEOUT);
ret = qm_mb_nolock(qm, &mailbox, QM_MB_MAX_WAIT_TIMEOUT);