IPC between Tasks

[Sartakov A. Vasily]

You need to add in LUA file communication channel:

http://os.inf.tu-dresden.de/L4Re/doc/examples_2libs_2l4re_2c_09_09_2shared_ds_2shared_ds_8lua-example.html



13.06.2012, в 18:13, Tobias Fink <tobias.fink at stud.h-da.de> написал(а):

> Right now I'm examining the example included in L4Re:
> http://os.inf.tu-dresden.de/L4Re/doc/examples_2libs_2shmc_2prodcons_8c-example.html
> This exists at this point:
> 
> if (l4shmc_create("testshm", 8192))
>    return 1;
> 
> I'm testing on an IGEPv2 Board with a DM3730 ARM Cortex-A8 processor.
> What am I missing?
> 
> Here is the output from the Boot process:
> 
> SIGMA0: Hello!
>  KIP @ 80002000
>  allocated 4KB for maintenance structures
> SIGMA0: Dump of all resource maps
> RAM:------------------------
> [0:80000000;80000fff]
> [0:8005d000;8008ffff]
> [0:8009f000;8013ffff]
> [4:80140000;80171fff]
> [0:80172000;80177fff]
> [4:80178000;8018efff]
> [0:8018f000;8100efff]
> [4:8100f000;8100ffff]
> [0:81010000;8118ffff]
> [4:81190000;8134afff]
> [0:8134b000;86ffffff]
> IOMEM:----------------------
> [0:0;7fffffff]
> [0:88000000;ffffffff]
> MOE: Hello world
> MOE: found 112192 KByte free memory
> MOE: found RAM from 80000000 to 87000000
> MOE: allocated 112 KByte for the page array @0x8005d000
> MOE: virtual user address space [0-bfffffff]
> MOE: rom name space cap -> [C:501000]
> 
> 
> 
> 2012/6/12 Tobias Fink <tobias.fink at stud.h-da.de>:
>> Hi Björn,
>> 
>> that helps to understand it a lot yes. The background of this is, that
>> I want to show what low level communication possibilities there would
>> be for two instances of l4linux for example without having to use
>> sockets or similar technologies. If this would be in principle
>> possible due to the fact that everything is a thread, then the example
>> that Vasily linked to is enough for me.
>> Thank you!
>> 
>> Tobi
>> 
>> 
>> 2012/6/12 Björn Döbel <doebel at os.inf.tu-dresden.de>:
>>> On 12.06.2012 14:41, Tobias Fink wrote:
>>>> Hi,
>>>> 
>>>> I'm planning on building a small example of a producer/consumer build
>>>> on top of L4Re. From the documentation I know about the shared memory
>>>> inteface which will help to pass information from the producer to the
>>>> consumer but I am a bit clueless on how I notify the consumer that
>>>> there is something new to read. The semaphore is only to be used in
>>>> between threads so there is no way to use them for IPC between Tasks?!
>>>> Is there another possibility to make this work other than to use
>>>> polling?
>>> 
>>> There is no communication between tasks, because tasks in terms of L4 /
>>> Fiasco.OC are only address spaces (plus some other state, such as the
>>> capability index table). The units of execution are always threads and
>>> hence communication always happens between those. Does that help you?
>>> 
>>> Bjoern
>>> --
>>> Dipl.-Inf. Bjoern Doebel    Mail:  doebel at tudos.org
>>> TU Dresden, OS Chair        Phone: +49 351 463 38 799
>>> Noethnitzer Str. 46         Fax:   +49 351 463 38 284
>>> 01187 Dresden, Germany      WWW:   http://www.tudos.org/~doebel
>>> --
>>> "Futbol no es en simple juego. Es una arma de la revolucion!"
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