On 31/10/2020 16:50, Richi Dubey wrote:
I want to learn more about how context switching works in RTEMS. I saw
the following lines in theaddispatch.c:
_Thread_Save_fp( executing );
_Context_Switch( &executing->Registers, &heir->Registers );
_Thread_Restore_fp( executing );
I do not understand how it works. Here, the executing process saves
its context by calling _Thread_Save_fp( executing ), then if a
different process resumes execution after the context switch, why does
it get the context of previous process (executing)?
The _Context_Switch() function changes the thread stack and the
non-volatile (callee save) registers. So, the value of the executing
local variable changes with a call to _Context_Switch().
--
Sebastian Huber, embedded brains GmbH
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