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[arch][arm-m] simplify context switch #382

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[arch][arm-m] simplify context switch #382

wants to merge 1 commit into from

Commits on Jun 21, 2023

  1. [arch][arm-m] simplify context switch 

    The context switch is now always performed inside the PendSV handler,
which greatly simplifies the code by reducing all switches to a single
path. This should also eliminate any race conditions during the switch.

Because we always enter PendSV for a switch, there is a slight
performance penalty in the case of switching from a non-preempted thread
to another non-preempted thread (~40 cycles longer on an M4, compared to
the previous implementation)
    @fdischner
    fdischner committed Jun 21, 2023
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