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From: andrey100100100@gmail.com
To: 9fans@9fans.net
Subject: Re: [9fans] syscall silently kill processes
Date: Mon, 20 Jun 2022 00:22:38 +0300	[thread overview]
Message-ID: <86055e9ba3dbe8ef06764d6d674830a8ec9404fa.camel@gmail.com> (raw)
In-Reply-To: <e9f6a0eb-d0f2-94a4-9adb-ae431c78a0d4@SDF.ORG>

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.
> 
> 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.
> 
> ------------------------------------------
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  reply	other threads:[~2022-06-19 21:23 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-17  9:37 andrey100100100
2022-06-17 13:46 ` Thaddeus Woskowiak
2022-06-17 14:11   ` Jacob Moody
2022-06-17 14:39     ` Thaddeus Woskowiak
2022-06-17 15:06     ` andrey100100100
2022-06-17 16:08       ` Skip Tavakkolian
2022-06-17 16:11         ` Skip Tavakkolian
2022-06-17 16:16           ` Skip Tavakkolian
2022-06-17 17:42             ` adr
2022-06-17 16:11       ` Jacob Moody
2022-06-17 18:48         ` andrey100100100
2022-06-17 19:28           ` Jacob Moody
2022-06-17 21:15           ` adr
2022-06-18  6:40             ` andrey100100100
2022-06-18  8:37               ` adr
2022-06-18  9:22                 ` adr
2022-06-18 12:53                   ` Jacob Moody
2022-06-18 22:03                     ` andrey100100100
2022-06-19  5:54                     ` adr
2022-06-19  6:13                       ` Jacob Moody
2022-06-18 22:22                   ` andrey100100100
2022-06-18 16:57                 ` andrey100100100
2022-06-19  2:40                   ` adr
2022-06-19  5:01                     ` adr
2022-06-19  8:52                       ` andrey100100100
2022-06-19 10:32                         ` adr
2022-06-19 11:40                           ` andrey100100100
2022-06-19 12:01                             ` andrey100100100
2022-06-19 15:10                           ` andrey100100100
2022-06-19 16:41                             ` adr
2022-06-19 21:22                               ` andrey100100100 [this message]
2022-06-19 21:26                                 ` andrey100100100
2022-06-20  4:41                                 ` adr
2022-06-20  5:39                                   ` andrey100100100
2022-06-20  5:59                                   ` adr
2022-06-20 15:56                                     ` andrey100100100
2022-06-20 22:29                                       ` Skip Tavakkolian
2022-06-21  7:07                                         ` andrey100100100
2022-06-21 11:26                                           ` adr
2022-06-21 13:03                                             ` andrey100100100
2022-06-21 13:22                                               ` adr
2022-06-28 15:28                                                 ` adr
2022-06-28 16:43                                                   ` ori
2022-06-28 18:19                                                   ` adr
2022-06-28 18:28                                                     ` adr
2022-06-28 19:09                                                   ` andrey100100100
2022-06-28 19:42                                                     ` adr
2022-06-29 13:14                                                       ` adr
2022-06-21 13:47                                             ` andrey100100100
2022-06-21  7:22                                         ` adr

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