Make remaining core channel spinlock opt-in #130
Merged
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This makes the remaining use of spinlocks in the core flume channel implementation opt-in based on the
spin
feature. Without this change the crate cannot safely be used in RTOS systems due to priority inversion issues leading to the spinlock spinning forever and lower-priority threads never getting a chance to run.I've left the async and select modules alone for now since we do not have a use for these at the moment, but I think it would make sense to perform the same change there as well. If you wish I could look into doing it as part of the same PR.