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Activation of staged code is scheduled for a later moment when
all schedulers have done a full memory barrier. This allow
them to read active code index while executing without any
memory barriers at all.
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This will prevent blocking entrire schedulers in the rare case when
several processes are racing to load/upgrade/delete/purge code.
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Move implementation from beam_load into new file code_ix.c and module.c
and make some function inline.
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Staging is a better and more general name as does not necessary need
to involve code loading (can be deletion, tracing, etc).
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Implemented some code_ix locks
and commented calls to erts_smp_thr_progress_block()
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Still blocking code loading
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