Support multiple concurrent Snapshot Readers #1776
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This is like a RWMutex, but doesn't block if the mutex is unavailable. Instead it returns an error.
This allows multiple Snapshots readers to be opened, but still ensures that a single active writer blocks both readers and writes. It's possible that a node might have to send Snapshots to multiple other nodes concurrently, so this change allows that.
otoolep
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This allows multiple Snapshots readers to be opened, but still ensures that a single active writer blocks both readers and writes. It's possible that a node might have to send Snapshots to multiple other nodes concurrently, so this change allows that.