First post, libuv newbie.
I am trying to understand how a multi-threaded web server would fit in the
libuv design. This is how I envision it, but I have some questions.
The main thread would run the HTTP accept loop, and I would expect each
connection request to be handled to a worker in the thread pool. Each
thread in the worker pool will also be doing I/O (think running a query
against MySQL), and will somehow pass the results back to the main thread.
After reading a bit here and there, I would think this is one way to do
this with libuv:
1. Main thread runs default loop and handles all the HTTP traffic. Whenever
it gets an HTTP request, it puts it in a thread-safe queue and does a
notify_all to awake one random thread in the pool; all of these threads
would be waiting on the queue.
2. One worker thread awakes, dequeues pending work from the queue and runs
it. I guess each thread has its own libuv loop, to handle the I/O needed to
go to MySQL / read a file / etc.
3. Once the request has been processed, the worker thread notifies the main
thread that the response is ready and tries to read the next pending
request from the queue; iterate.
4. The main thread sends the response back to the HTTP client and closes
Now, there's some hand waving here, and I am not sure if what I'm
describing is the proper / correct / best / possible way to do this with
libuv. Some specific questions:
1. Is using a thread-safe queue a good match for libuv? If libuv provides
something like this, I have not been able to find it, and that makes me
doubt this would be the libuv way.
2. Is it possible / advisable to have multiple threads in a process, each
handling I/O with its own libuv loop? I guess yes.
3. How would the worker threads notify the main thread that a response is
ready? Would they use an async handle for this? If yes, can they all use
the same async handle, or would each worker require their own async handle
plugged to the main thread loop? But if they all share the same async
handle, how does the main thread know which connection this response should
be sent to?
Feel free to completely destroy this description and show me the right way
to do this. Thanks for any hints and comments. Cheers!
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