[riot-notifications] [RIOT-OS/RIOT] fe310: Use ecall instruction for thread yield (#15736)

Marian Buschsieweke notifications at github.com
Mon Jan 11 13:26:34 CET 2021

Let's wait for @nmeum to see if this also fixes his use case. But generally speaking, I like using `ECALL` due to the additional flexibility the arguments provide. Combined with a memory protection unit this could be used to implement a real syscall interface and a somewhat isolated user space. (We might for simplicity just share the heap for `malloc()` and friends between threads.)

And also: It is faster :-)

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