mlsad3
fd820380a6
- Closes #712. - Replace synchronous `write()` calls in `BidirectionalRelay` with non-blocking I/O and `DispatchSourceWrite` backpressure handling. Under concurrent vsock proxy load, a single blocked write on the shared serial dispatch queue would freeze all relay connections permanently, including unrelated new connections. - Set relay file descriptors to `O_NONBLOCK` and handle `EAGAIN` by suspending reads and installing a write source to drain pending data. - Give each `BidirectionalRelay` its own serial queue instead of sharing one from `UnixSocketRelayManager`, eliminating cross-connection blocking. - Resume suspended read sources before cancelling in `stop()` — GCD does not deliver cancel handlers on suspended dispatch sources, which caused file descriptor and memory leaks on teardown under backpressure. - Guard-unwrap `buf.baseAddress` in `drainPendingWrite`.
OS
This target contains general useful OS related definitions or wrappers.