1 # -*- encoding: binary -*-
4 # Spawns a new thread for every client connection we accept(). This
5 # model is recommended for platforms like Ruby 1.8 where spawning new
6 # threads is inexpensive.
8 # This model should provide a high level of compatibility with all
9 # Ruby implementations, and most libraries and applications.
10 # Applications running under this model should be thread-safe
11 # but not necessarily reentrant.
13 # If you're connecting to external services and need to perform DNS
14 # lookups, consider using the "resolv-replace" library which replaces
15 # parts of the core Socket package with concurrent DNS lookup
22 def worker_loop(worker)
23 init_worker_process(worker)
24 RACK_DEFAULTS["rack.multithread"] = true
25 threads = ThreadGroup.new
28 limit = worker_connections
32 alive.chmod(m = 0 == m ? 1 : 0)
33 IO.select(LISTENERS, nil, nil, timeout) or next
36 rescue Errno::EBADF, TypeError
39 alive.chmod(m = 0 == m ? 1 : 0)
42 # Sleep if we're busy, another less busy worker process may
43 # take it for us if we sleep. This is gross but other options
44 # still suck because they require expensive/complicated
45 # synchronization primitives for _every_ case, not just this
46 # unlikely one. Since this case is (or should be) uncommon,
47 # just busy wait when we have to.
48 while threads.list.size > limit # unlikely
49 sleep(0.1) # hope another process took it
50 break # back to IO.select
53 threads.add(Thread.new(l.accept_nonblock) {|c| process_client(c) })
54 rescue Errno::EAGAIN, Errno::ECONNABORTED
59 end while LISTENERS.first && master_pid == Process.ppid
60 join_threads(threads.list, worker)