В Пн, 20/06/2022 в 00:22 +0300, andrey100100...@gmail.com пишет: > В Вс, 19/06/2022 в 16:41 +0000, adr пишет: > > On Sun, 19 Jun 2022, andrey100100...@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 ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/Tfa6823048ad90a21-M06156a275c41ac100d18311b Delivery options: https://9fans.topicbox.com/groups/9fans/subscription
