kou opened a new issue, #163:
URL: https://github.com/apache/arrow-flight-sql-postgresql/issues/163
If we can't read/write any data, the current logic waits until any readable
data/write space is available. For example, here is the read wait workflow:
1. `read()` -> 0 bytes read
2. `wait()`
1. Check the current readable size in a shared buffer
2. Loop
1. Check the current readable size in a shared buffer
2. Compare 2.ii.a with 2.i
We don't acquire a lock between 1. and 2.i. If new data is arrived between
1. and 2.i, the new data isn't detected. It may cause a deadlock.
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