Simple play with etimer <9 supplement to contiki Study Notes>

 

This picture is a supplement to the previous <contiki study note 9>.

Simple play with etimer <9 of contiki Study Notes>

Maybe you are opening the last layer of contiki process;

Maybe there is still a way to go;

Maybe you have opened it...

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Everything is only process; only with process will it be the turn of etimer_process to speak, unless, throwing away all mechanisms, bare metal Implementation of etimer...

Process, what is it? A linked list is still unidirectional. That's all. A slight characteristic is that a node of this linked list may be linked to another linked list-you can think that the two linked lists vertically intersect to 90 °... Of course, this is not a geometric, but a set.

What is etimer? Some timeout mechanism... similar to sleep (). But it also makes itself a linked list. However, any process that uses the etimer mechanism must add the etimer variable set by itself to the etimer linked list. Of course, at the end of the chain, the etimer will remove the chain table without any reason, only a contract.

As a result, communication between processes starts, and there is social networking between processes.

All of these are linked lists. Grasshoppers on the same rope? The more you see the image.

Well, the lower-level contiki OS tries to operate these linked lists. And the application, don't care about these things, even though you can implement a process point of your own...

 

 

 

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