Hi all,
I have written a scsi pass through driver on Mac Os X
. I have used VendorSpecificType00UC driver available
on apple site.
But currently my function calls in the driver are
synchronous due to which I am getting a low
performance. So I want to make that driver
asynchronous i.e. all function call like
read,write,inquiry, read_capacity will work
asynchronously. So I have done some changes as follows
in my existing code.
Changes are
1) Setting Application layers reference in request
using SetApplicationLayerReference (..)
2) Instead of using Send_Command(request , timeout ),
I have used Send_Command(request,timeout,callback) to
give the name of callback function.
In my driver , my user client is calling the
functionality of my driver.
Code snap as follows
class com_MyCompany_driver_VendorSpecificType00UC:
public IOSCSIBlockCommandsDevice
{
void ReadCapacity(....);
static void sTaskCallback(..);
};
void
com_MyCompany_driver_VendorSpecificType00UC::ReadCapacity(....)
{
refCon = ( SCSITaskRefCon * )
GetApplicationLayerReference ( request);
refCon->commandType = kCommandTypeExecuteAsync;
refCon->self = this;
SetApplicationLayerReference ( request , (void *)
&refCon );
create_cdb(request);
SetDataTransferDirection(request,
kSCSIDataTransfer_FromTargetToInitiator);
SetDataBuffer(request, tempbuf);
SetRequestedDataTransferCount(request,
DataTransferCount);
SendCommand(request
20,&com_MyCompany_driver_VendorSpecificType00UC::sTaskCallback);
}
void
com_MyCompany_driver_VendorSpecificType00UC::sTaskCallback(..)
{
.........
}
When my program calls ReadCapacity(..) , my machines
gets crashed.I am not able to trace this
problem.Please give me some hint or direction so that
I will make all function call asynchronous.
Regards,
Girish.
Email Address : email@hidden
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