tinyos-2.x/tos/lib/tosthreads/system/TosMallocC.nc This probably has just what you are looking for.
Kevin On Mon, Dec 21, 2009 at 7:13 AM, Ricardo . <[email protected]> wrote: > Now I understand! Thank you both! > > Regards, > -- > Ricardo > On Mon, Dec 21, 2009 at 11:59 AM, Guillermo De Cesco <[email protected]> > wrote: >> >> Hi, >> >> That means that you have to implement your own memory management component >> and define a parameterized interface that allows you to manage clients, so >> in your application if a module needs dynamic memory its just connect to >> this interface.Note that you will be allocating memory with your >> implementation not malloc. >> >> -Bill >> >> On Mon, Dec 21, 2009 at 7:15 AM, Ricardo . <[email protected]> >> wrote: >>> >>> These give me a great help to understand these issues of dynamic memory, >>> and for that thank you! I have just one more question: >>> >>> In "tinyos-programming.pdf" is said: "If your application requirements >>> necessitate a >>> dynamic memory pool, encapsulate it in a component and try to limit the >>> set of users." -- This means that any code that uses dynamic memory should >>> be done in a separate component? I see no relevance in this ... : S >>> >>> On Sun, Dec 20, 2009 at 9:37 PM, Faisal Aslam >>> <[email protected]> wrote: >>>> >>>> Dear Ricardo, >>>> >>>> > First of all thank you for your answer. >>>> > >>>> > Is slower because it has to find a contiguous space of memory large >>>> > enough >>>> > to reserve, or is there another reason(s)? >>>> >>>> May be someone with more experience in C can give better reply on this. >>>> However, it is slower for sure. It takes CPU cycle to manage memory, >>>> i.e. >>>> to allocate and deallocate space. >>>> >>>> > If it is possible in all versions of TinyOS, why in some of the >>>> > literature >>>> > says it is not possible? : S >>>> >>>> I do not know any literature that says it is not allowed to use dynamic >>>> memory in TinyOS. One can write plan C code in TinyOS and C allows >>>> dynamic >>>> memory allocation in MSP430 and AVR microcontroller. I know it because >>>> we >>>> have done that. >>>> >>>> best regards, >>>> >>>> -- >>>> Faisal Aslam >>>> >>>> PhD Student >>>> University of Freiburg >>>> http://cone.informatik.uni-freiburg.de/people/aslam/ >>>> > On Fri, Dec 18, 2009 at 5:38 PM, Faisal Aslam < >>>> > [email protected]> wrote: >>>> > >>>> >> Dear Ricardo, >>>> >> Here is my take on your questions. See inline. >>>> >> >>>> >> >>>> >> Ricardo . wrote: >>>> >> >>>> >>> >>>> >>> Dear all, >>>> >>> >>>> >>> I need your help to clear up a question: my application needs >>>> >>> dynamic >>>> >>> memory, and literature that I've found some say it is not possible, >>>> >>> other >>>> >>> say it's possible but it is not efficient. >>>> >>> >>>> >>> My questions are: >>>> >>> >>>> >>> 1 - Which version of TinyOS is possible to use dynamic memory? >>>> >>> >>>> >> In all the versions. You can write pure C code in TinyOS and all >>>> >> compilers >>>> >> I know support dynamic memory. >>>> >> >>>> >> 2 - Any mote supports dynamic memory? >>>> >>> >>>> >> All motes. >>>> >> >>>> >> 3 - What is the reason for dynamic memory is not efficient? >>>> >>> 4 - Using dynamic memory greatly affects the efficiency, or is >>>> >>> almost >>>> >>> imperceptible? >>>> >>> >>>> >> The answer of both question 3 and 4 is as follows. Dynamic memory >>>> >> means >>>> >> that you cannot predict memory usage at compile time and could go out >>>> >> of >>>> >> memory easily. You have to deallocate memory yoursef carefully. There >>>> >> are >>>> >> more chances of complicated errors. The allocating and deallocating >>>> >> memory >>>> >> is slow process and your code will execute slower. The static memory >>>> >> allocation is much more safer and faster. >>>> >> You can also program your motes using Java. It has automatic garbage >>>> >> collection and will give you "out of memory" error. It is usually >>>> >> safer >>>> >> to >>>> >> use Java then C. Unlike C in Java you cannot have segmentation fault. >>>> >> You >>>> >> can use data structure like Vector that will grow dynamically etc. >>>> >> >>>> >> >>>> >>> >>>> >>> I wonder if anyone knows explain some of these issues (preferably >>>> >>> all >>>> >>> =)), >>>> >>> or if anyone know of any literature where I can get answers. >>>> >>> >>>> >>> Thankyou very much, >>>> >>> -- >>>> >>> Ricardo >>>> >>> >>>> >> >>>> >> -- >>>> >> Faisal Aslam >>>> >> >>>> >> University of Freiburg >>>> >> http://cone.informatik.uni-freiburg.de/people/aslam/ >>>> >> >>>> >> >>>> > _______________________________________________ >>>> > Tinyos-help mailing list >>>> > [email protected] >>>> > >>>> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>>> >>>> >>>> >>>> >>> >>> >>> _______________________________________________ >>> Tinyos-help mailing list >>> [email protected] >>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> >> >> -- >> Ing. Guillermo De Cesco >> Invenio Ingenieria srl. >> tel: (54)2944 442119 >> cel:(54)2944 15534750 >> web: www.invenioing.com >> Av. Pioneros 4163 Dpto 6. CP(R8402AMH) >> San Carlos de Bariloche. >> Rio Negro, Argentina. > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > -- ~Kevin _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
