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+# :enddoc:
+module Rainbows::WorkerYield
+
+  # Sleep if we're busy (and let other threads run).  Another less busy
+  # worker process may take it for us if we sleep. This is gross but
+  # other options still suck because they require expensive/complicated
+  # synchronization primitives for _every_ case, not just this unlikely
+  # one.  Since this case is (or should be) uncommon, just busy wait
+  # when we have to.  We don't use Thread.pass because it needlessly
+  # spins the CPU during I/O wait, CPU cycles that can be better used by
+  # other worker _processes_.
+  def worker_yield
+    sleep(0.01)
+  end
+end