Is Apache blocking I/O or non-blocking IO?
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It forks a process for each connection, so it probably is blocking (unless it watches for timeout on the same thread as the socket i/o?).
To be sure you should probably look for socket creation calls in the source, and follow accesses to the socket descriptors… I’m not even sure if Apache has to do the forking mode, maybe it has an asynchronous mode too.
Edit
Right, there are a bunch of “Multi-Processing Modules“, which decide how to handle multiple HTTP requests.