how to use same stack space for multiple threads running at different stages of the app

RE: how to use same stack space for multiple threads running at different stages of the app

ziv123 — Mon, 18 Sep 2023 10:54:43 GMT

thanks, though, this much i have found, as can be seen in my previous message.

however, i will ask if there is a possibility to use the same thread stack object for more then one thread (which run at the same time) but the stack sam required for the 2 or more thread is still smaller then the stack size of the stack object .. maybe by using an array of stacks like "K_THREAD_STACK_ARRAY_DEFINE" but i also will need one of the threads that works alon to use the size of the complete array.. is that possible ?

2. there are this commit

https://github.com/zephyrproject-rtos/zephyr/issues/26999

https://github.com/zephyrproject-rtos/zephyr/pull/44727

https://github.com/zephyrproject-rtos/zephyr/issues/25973

that maybe i did not get it right but it looks like there is some option to create a thread dynamically (using "pthread_create") with a stack pointer of void type (which can by allocated dynamically i assume)...

can you help me understand that better, and how to use it or if there is some example in nrf connect sdk or zephyr that implement such functionality ?

hope to read you soon

best regards

Ziv

RE: how to use same stack space for multiple threads running at different stages of the app

Øivind — Fri, 15 Sep 2023 12:26:14 GMT

Hi again,

From what I have found, allocating the stack dynamically is not possible, and the closest you would come is to terminate the earlier thread and re-use the stack object for the new thread.
But in that case you might as well use a single thread that handles everything, which you suspend when it is not in use.

Unfortunately, if that requires too much ram, you may have to look into ways of reducing the peak ram usage of the threads.

RE: how to use same stack space for multiple threads running at different stages of the app

ziv123 — Tue, 05 Sep 2023 19:07:40 GMT

just adding i found that it may be possible to define a thread stack with K_THREAD_STACK_DEFINE and then using the defined stack with K_THREAD_STACK_DECLARE for different threads, but since not all thread need the same stack size its not that helpful,

so to be more specific i hope there is a way, and this is what i haven't found yet and need help with, to allocate stack for a thread dynamically ..

hope to read from you soon and hope you will have good findings 😊 🙏

RE: how to use same stack space for multiple threads running at different stages of the app

Øivind — Mon, 04 Sep 2023 22:05:21 GMT

Hi,

I'll look into this and get back to you.