[Experiment] Reduce the number of syscalls - #38747

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Commits on Jul 1, 2020

SocketPal does not need to be partial
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after a succesfull partial read, set queue state to waiting so next read does not peform a syscall but rather waits for epoll notification
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when epoll notification is received and the state is waiting and the queue is empty, change the state to ready
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Commits on Jul 2, 2020

Commits on Jul 6, 2020

Commits on Jul 7, 2020

state can be set to Waiting only if IO space has been exhausted AND we did not receive any new epoll notifications in the meantime (state==processing, _sequenceNumber++)
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