[cffi-devel] [Sbcl-devel] GC write-protected mappings vs. the OS kernel

[Samium Gromoff]

From: Juho Snellman <jsnell at iki.fi>
> Samium Gromoff <_deepfire at feelingofgreen.ru> writes:
> 
>> Good day,
>> 
>> While debugging mysterious ioctl() failures in lh-usb on SBCL,
>> I have discovered that using CFFI:WITH-POINTER-TO-VECTOR-DATA
>> doesn't guarantee that the vector is in a writable region.
> 
> I thought we'd never write protect specialized raw arrays (either they
> are in the nursery, or they're tenured into an unboxed region which
> never get wpd). And passing generic arrays to ffi doesn't feel right.
> What's the use case?

Array element type is (unsigned-byte 8), use case is shovelling
data in/out a USB device using bulk transfers via ioctl().


regards,
  Samium Gromoff
--
                                 _deepfire-at-feelingofgreen.ru
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