http_client: enable an infinite number of recursive requests by using a std::queue rather than an ML::RingBufferSRMW (TRIVIAL)
runner_stress_test: improved atomicity
write: trigger wakeup unconditionnally, so that the message queue gets another
chance of being emptied
"canSendMessages" returns true when closing is false and fd_ is != -1
handleWakeupEvent: close file descriptor only when not already closed by
another request
AsyncWriterSource: added the protected method "emptyMessageQueue"
AsyncWriterSource: reworked interface documentation