OS_ServiceCall &9F (DCI)

Is Nemo version of ‘HostFS’ a replacement for VRPC’s version or RPCEmu?

With ref to my problem – the 32bitted mod works ok with RO4.02 – Hibernate and back ok.

If VRPC – RO5.25 – is loaded without the Internet module – Hibernate and back seems ok (apart from some black screens)
Then loading the Internet module – networks works.
But then the Hibernate doesn’t :-(

Rmkilling the Internet module – seems to make no difference.

Google Drive protected my entire life’s work when every other backup failed.

Whether that’s good or bad perhaps depends upon how many and what sort of backups you have. I mean, you don’t still use Zip discs, right? :-)

Just so long as you don’t object to various entities looking over your shoulder (automated, obviously, unless something catches the interest of the cat-loving-AI-overlord). I trust you have nothing that the GDPR would object to…

Unfortunately, if I try and save to the same file again whilst Drive is still uploading it, HostFS reports “Open file”, gets stuck, and can never access the file again – I have to quit and restart (happens a lot when updating StrongHelp files). Because of that I usually pause Drive while using VRPC (it did not originally behave like this, Google changed something).

Probably file locks. The MS server boys have to deal with files that are deadlocked because a crashed process left them locked fairly regularly. Sometimes the file is locked until a reboot. At a guess Google drive is locking the file so it doesn’t change part way through a transfer.

“Your data is safe in the cloud”

Apart from when this happens…

Probably file locks.

Didn’t they rather defeat the idea of document collaboration?

Apart from when this happens…

Yes, something didn’t ring true with that story. You’d have thought the various (alleged) prompts would have been noticed in the course of the discussion…

As you might expect the quotes were indicating that I was expressing just a little cynicism. The issue with these things is the cloud storage has a copy of a version of your files, whether that version is the specific version you were hoping for is not a 100% match as people have already noted.

Didn’t they rather defeat the idea of document collaboration?

In any system the file you access must, for however brief a time, be exclusively yours. The problem comes when that brief lock gets stuck.
Back on the topic of the VRPC you have to remember that the RO system has no concept of another user “simultaneously” doing things to a file. Like, er, what other user?
If you use a RPCEmu instance and open a text file in windows and also in RO and try a save in either end then one end or the other will complain.
It could be fun in a multi-core build if more than one core has access to a file and wants to save.

Is Nemo version of ‘HostFS’ a replacement for VRPC’s version or RPCEmu?

VRPC.

I haven’t made a 32bit version

That was a lie. :->

It could be fun in a multi-core build if more than one core has access to a file

Ain’t going to happen (I don’t think), at least not in the way you’re implying. File operations would (probably) have to be the responsibility of the main UI thread, though handles of open files could be passed to other threads… even so, this would require threadsafe filing systems.

More likely, at least at first, is non-blocking file operations as part of the scheduling of a thread-pool system in a ‘worker’ model. So a task could say (to the TaskManager) “Read in all this data from this file, then process it using this code in as many pieces as you think appropriate, and let me know when it’s done”.

Are there any examples/info on SWI OS_ClaimDeviceVector?

What goes in R3/R4 when called?

[edi]
In the interupt code – how do you switch to SVC mode for calling XOS_CallBack?

I’m sure you’ve found this

IRQ is a privileged mode, so you can just alter the processor mode direct. On modern processors you would do something like: [edited]

    MRS     R7, CPSR
    ORR     R14, R7, #3     ; SVC mode
    MSR     CPSR_c, R14
    STR     R14, [R13,#-4]!
    SWI     XOS_AddCallBack
    LDR     R14, [R13],#4
    MSR     CPSR_c, R7      ; back to previous privileged mode

On old processors you use TEQP similarly.

The NOPs are superfluous (it’s only conditional MSR CPSR_c that needs extra care)

Also, remember to preserve R14 after switching from IRQ to SVC mode (and restore it when switching back, obviously)

Oh yes. I recall the bug being clarified, but originally it was “MSR/NOP”. I remember Stewart remarking that it was a pity a conditional TEQP couldn’t be the NOP. Updated the example.

I remember Stewart remarking that it was a pity a conditional TEQP couldn’t be the NOP

It can.

http://web.archive.org/web/20160316033132/http://www.iyonix.com/32bit/32bitTech.shtml

D’oh! It’s the other way around. MSR/TEQP good, TEQP/MSR bad.

I seem to have tweaked HostFSFiler again. (This is surprisingly useful)

nemo demonstrated

cool gif image.

Is this on your 64-bit version of RISC OS or just your 32-bit version of RISC OS? ;-?

Actually… it’s on my stubbornly 26bit version of RISC OS. But HostFSFiler is 32bit now. ;-)

The amount of valuable stuff on your hard drive must be scary!

The amount of valuable unfinished stuff on your hard drive must be scary!

Fixed that for you.

how many Operating System do you know inside out?
Are we talking just RISC OS or ‘all the others’?

“What a man knows could fill a book.
What he does not know fills the library.”

what this man(me) knows could fill a phamphlet.

https://www.youtube.com/watch?v=RS49gJ2eKrY&

Thanks for the ideas – still havn’t found out why – the difference between RO4.02 an RO5.25 VRPC-DL – with the ‘Internet’ module – with ‘Hibernate’ :-(

I think this came up before – something that would work with a Podule version of Internet – as opposed to a softload version.

I am using OS_LeaveOS but RO4.02 doesn’t have that call – as standard.

teq    pc,pc
msreq  cpsr_c,#&10 ;enter 32bit usr mode
teqnep pc,#0 ;enter 26bit usr mode

Is there any podule programming info available?
As a matter of interest – did anyone make a PCI to Podule adaptor?
{edit]

Also be very wary of OS_LeaveOS, as very many versions of CallASWI have a botched implementation that attempts to put you in a non-existent processor mode.

what this man(me) knows could fill a phamphlet.

Brilliant put down.

But, yet, this man couldn’t even fill a pamphlet (even counting the endless repetitions).