Jim Mussared 243805d776 py/scheduler: Fix race in checking scheduler pending state. ...

Because the atomic section starts after checking whether the scheduler
state is pending, it's possible it can become a different state by the time
the atomic section starts.

This is especially likely on ports where MICROPY_BEGIN_ATOMIC_SECTION is
implemented with a mutex (i.e. it might block), but the race exists
regardless, i.e. if a context switch occurs between those two lines.

2020-04-13 21:55:47 +10:00

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