To open a table in a Tokyo Cabinet one needs to create a new handle with tcbdbnew() and actually open a file with tcbdbopen(). Before opening, one can prepare the handle for multi-threaded use with tcbdbsetmutex(), set a custom comparison function with tcbdbsetcmpfunc(), and set various tuning parameters with tcbdbtune(). MySQL is multi-threaded, so we will use that handle concurrently, and, of course, we will need our comparison function, but we won't do any tuning in our example. There is no special function to create a Tokyo Cabinet file, it is created by opening. That is, both ha_tocab::open() and ha_tocab::create() will open a Tokyo Cabinet file, and we can factor out this functionality in a helper function:
static TCBDB *open_tcdb(const char *name, TABLE *table,
int *error)
{
char fname[FN_REFLEN+10];
strcpy(fname, name);
strcat(fname, ".tocab");
*error = 0;
TCBDB *dbh = tcbdbnew();
if (!dbh) {
*error = HA_ERR_OUT_OF_MEM;
return 0;
}
if...