On Thu, Jul 23, 2009 at 9:05 PM, Alan Stern<stern@xxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, 23 Jul 2009, Madhavi Manchala wrote:
>
>> 2) I would like to wake up thread-2 from main thread when ever there
>> is a next command to process (at this time thread-1 is busy processing
>> first command). I guess, to handle like this, I need to create
>> different buffer heads for each thread. Am I correct?
>
> Well, you will certainly want to have more than two buffer heads. Two
> per thread ought to be enough.
Dear Alan,
The below snippet is used to allocate the buffer heads. Currently
NUM_BUFFERS is defined to 2. I would like to change it 4. Two buffer
heads per thread. Is this the correct approach?
/* Allocate the requests */
for (i = 0; i < NUM_BUFFERS; ++i) {
struct fsg_buffhd *bh = &fsg->buffhds[i];
if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
goto reset;
if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
goto reset;
bh->inreq->buf = bh->outreq->buf = bh->buf;
bh->inreq->context = bh->outreq->context = bh;
bh->inreq->complete = bulk_in_complete;
bh->outreq->complete = bulk_out_complete;
}
Does dummy hcd understand the changes and use the FOUR buffers heads
instead of TWO buffer heads?
Pleas let me know if there are any concerns.
Thanks and Regards,
Srinivas G
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