On Tue, Sep 28, 2021 at 11:21 AM Петр Борисенко <pe...@awsmtek.com> wrote: > > > By wanting static allocation only, you need to use the special task and > queue create APIs for that and avoid services which do dynamic allocation > > Are we talking about some existing API? Can you provide a link for > documentation?
Existing APIs. If you use rtems_task_create() the task stack will be dynamically allocated. If you use rtems_task_construct(), you provide the stack space and nothing is dynamically allocated. https://docs.rtems.org/branches/master/c-user/task/directives.html#rtems-task-construct Similar API for RTEMS message queue where you provide the pending message buffers https://docs.rtems.org/branches/master/c-user/message/directives.html#rtems-message-queue-construct And you want to configure maximum numbers of each type of object so they are pre-allocated. When you configure unlimited, there is no hard limit, nothing is pre-allocated. Sebastian is there any guidance in the Classic API or Users Guide about static systems? > > On Tue, Sep 28, 2021, 6:33 PM Joel Sherrill <j...@rtems.org> wrote: >> >> >> >> >> On Tue, Sep 28, 2021, 10:05 AM Петр Борисенко <pe...@awsmtek.com> wrote: >>> >>> Seems pretty obvious, but I mean kernel. When I define a queue or a task, >>> will it compile statically or it will get memory from heap during the >>> initialization? @Sebastian Huber mentioned that it depends on using of >>> UNLIMITED_OBJECTS configuration option. On >> >> >> Unlimited objects is inherently dynamic memory allocation. It assumes that >> there are no hard limits on the number of objects created. Historically, all >> Classic API and POSIX API structures were allocated from the RTEMS Workspace >> and this lets you dynamically extend the number of objects until you run out >> of memory. >> >> Combine it with unified work area and you can allocate until all memory on >> your board is consumed. >> >> By wanting static allocation only, you need to use the special task and >> queue create APIs for that and avoid services which do dynamic allocation. >> >> --joel >>> >>> >>> On Tue, Sep 28, 2021, 5:26 PM Joel Sherrill <j...@rtems.org> wrote: >>>> >>>> >>>> >>>> On Tue, Sep 28, 2021, 6:43 AM Петр Борисенко <pe...@awsmtek.com> wrote: >>>>> >>>>> Hello! >>>>> Is it possible to compile Rtems statically and disable memory allocation >>>>> routines and heap? >>>> >>>> >>>> No. You have to restrict your application use of APIs and services to >>>> those which do not use dynamic allocation. >>>> >>>> --joel >>>>> >>>>> _______________________________________________ >>>>> users mailing list >>>>> users@rtems.org >>>>> http://lists.rtems.org/mailman/listinfo/users _______________________________________________ users mailing list users@rtems.org http://lists.rtems.org/mailman/listinfo/users
