[zeromq-dev] Thread Safe sockets

[Nadav Samet]

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> How readable is that? And what about the global variables? etc.
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I absolutely agree that recv() is more readable than using callbacks, but
it has the undesirable characteristic that it blocks the calling thread
until the response arrives...  Imagine an RPC server A with a few worker
threads that in order to process a request from a client it needs to make a
request to another server B. Having a worker thread on server A blocking on
recv() from a socket that is connected to server B will hurt performance.
The waiting thread could have been serving other requests while it has been
waiting inside recv().
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