ld_mutex_lock_fn
if ((ld)->ld_mutex_lock_fn != NULL && ld->ld_mutex != NULL) { \
(ld)->ld_mutex_lock_fn(ld->ld_mutex[lock]); \
(ld)->ld_mutex_lock_fn(ld->ld_mutex[lock]); \
if ((ld)->ld_mutex_lock_fn != NULL && ld->ld_mutex != NULL) { \