Re: [libusb] Asynchronous transfer using libusb-1.0 on ubuntu

[Tim R. <ti...@pr...>]

Ларионов Даниил wrote:
>> You can't have overlapping transfers. Remember that the model
>> anticipates physical devices, which have one read head that can only be
>> one place at a time. It's all serialized.
> It's almost a decade since the last time I touched Mass Storage Class so I can be entirely wrong, please correct me in this case.
> But isn't it just a (very) thin wrapper over the SCSI protocol?

The command structure definitely is a subset of the SCSI protocol. 
However, the semantics and guarantees are not the same, and I think the
commands are serialized.  This, in fact, was the primary impetus behind
the "bulk streams" concept in USB 3.  You can have multiple independent
data streams on a single bulk pipe, which allows you to have multiple
mass storage transfers going at once.

-- 
Tim Roberts, ti...@pr...
Providenza & Boekelheide, Inc.