int
itc_async_read_1 (it_cursor_t * itc, dp_addr_t dp, dp_addr_t phys_dp,
buffer_desc_t * buf, buffer_desc_t * decoy)
{
#if 0
#error Not supposed to be on with 5.0
/* if the iq for the dp to read is busy, put the read in the iq instead of doing it here.
* Called outside map, returns 1 inside map if the read was scheduled, otherwise returns 0 outside map. */
int n;
io_queue_t * iq = db_io_queue (ITC_STORAGE (itc), phys_dp);
buffer_desc_t * queued;
if (!iq || !iq_is_on ())
return 0;
queued = iq->iq_first;
for (n = 0; n < 10; n++)
{
if (!queued)
return 0;
queued = queued->bd_iq_next;
}
/* items in the queue. Add to the queue. */
buf->bd_being_read = 1;
ITC_IN_MAP (itc);
buf->bd_page = 0;
isp_set_buffer (itc->itc_space, dp, phys_dp, buf);
buf->bd_write_waiting = NULL;
itc->itc_n_reads++;
ITC_MARK_READ (itc);
buf->bd_waiting_read = decoy->bd_waiting_read;
buf->bd_readers = 0;
ITC_LEAVE_MAP (itc);
iq_schedule (&buf, 1);
ITC_IN_MAP (itc);
return 1;
#else
return 0;
#endif
}
void
iq_schedule (buffer_desc_t ** bufs, int n)
{
int inx;
int is_reads = 0;
buf_sort (bufs, n, (sort_key_func_t) bd_phys_page_key);
for (inx = 0; inx < n; inx++)
{
if (bufs[inx]->bd_iq)
GPF_T1 ("buffer added to iq already has a bd_iq");
bufs[inx]->bd_iq = db_io_queue (bufs[inx]->bd_storage, bufs[inx]->bd_physical_page);
}
DO_SET (io_queue_t *, iq, &mti_io_queues)
{
int n_added = 0;
buffer_desc_t * ipoint;
int was_empty;
IN_IOQ (iq);
inx = 0;
ipoint = iq->iq_first;
was_empty = (iq->iq_first == NULL);
while (inx < n)
{
buffer_desc_t * buf = bufs[inx];
if (!buf || buf->bd_iq != iq)
{
inx++;
continue;
}
is_reads = buf->bd_being_read;
if (buf->bd_iq_next || buf->bd_iq_prev)
GPF_T1 ("can't schedule same buffer twice");
bufs[inx] = NULL;
next_ipoint:
if (!ipoint)
{
L2_PUSH_LAST (iq->iq_first, iq->iq_last, buf, bd_iq_);
n_added++;
inx++;
}
else if (BUF_SORT_DP (ipoint) < BUF_SORT_DP (buf))
{
ipoint = ipoint->bd_iq_next;
goto next_ipoint;
}
else if (BUF_SORT_DP (ipoint) == BUF_SORT_DP (buf))
GPF_T1 ("the same buffer can't be scheduled twice for io");
else
{
L2_INSERT (iq->iq_first, iq->iq_last, ipoint, buf, bd_iq_);
n_added++;
inx++;
}
if (!buf->bd_being_read)
{
page_leave_outside_map (buf);
}
}
LEAVE_IOQ (iq);
if (n_added && !is_reads)
{
dbg_printf (("IQ %s %d %s added, %s.\n", IQ_NAME (iq),
n_added, is_reads ? "reads" : "writes",
was_empty ? "starting" : "running"));
}
if (n_added && was_empty)
semaphore_leave (iq->iq_sem);
}
END_DO_SET ();
if (n)
{
if (is_reads)
mti_reads_queued += n;
else
mti_writes_queued += n;
}
}