Re: [9fans] syscall silently kill processes

[andrey100100100@gmail.com]

В Пн, 20/06/2022 в 00:22 +0300, andrey100100100@gmail.com пишет:
> В Вс, 19/06/2022 в 16:41 +0000, adr пишет:
> > On Sun, 19 Jun 2022, andrey100100100@gmail.com wrote:
> > > Yes, you were absolutely right, the thread library needs some
> > > work.
> > > 
> > > It is impossible to use multiple processes with notes, due to the
> > > exhaustion of the NFN limit.
> > 
> > Andrej, what are you going to do with alarm in the real thing?
> 
> The note 'alarm' is needed to interrupt the system call on timeout
> since system calls to lan 9 can be of a network nature, a notes is
> indispensable.
> A great example of this is the read() system call on a udp-
> connection.
> How else can this system call be interrupted?
> 
> 
> 
> > You could use threads (cooperative round-ribbon multitasking) using
> > some data log to register their state and use a "master" thread to
> > control them (kill them, change some data structure, etc).
> > 
> > You can use rfork, locks, pipes, etc and forget about libthread.


Channels are a good abstraction for exchanging data between processes.
Even if not to use the libthread, I would have to (probably) write it.
But yeah, maybe it's easier to do without it.

> > 
> > You could experiment with the topology of the nodes, for example
> > instead of a big star you can simplify things a lot using chains
> > of nodes where the last node sends the chain data to the analyzer
> > (you were talking about polling sensors):
> > 
> > aNode1 --> aNode2 --> aNode3 --> ... --> aNoden -->
> >                                                                    
> >   
> >                   > --- > Anz
> > bNode1 --> bNode2 --> bNode3 --> ... --> bNoden -->
> > 
> > Imagine that n=100. Each node only has to make a connection with
> > 2 nodes (the first of the chain just one), adding data to the
> > received one and send it to the next. Anz only has to make a
> > connection with the last nodes of the chains, two in this case,
> > and process the data received. Of course you have to play with your
> > numbers, the acceptable delay, etc.
> > 
> > I'm pretty sure people here could point you to some examples using
> > plan9, and note that you could use raspberry pi zeros as nodes.
> > 
> > Have fun.
> > 

Regards,
Andrej


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