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feat(xpp): add Runtime::enter() and async UdpSocket - #203
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Runtime::enter() returns an EnterGuard for use outside block_on, enabling async operations in tests and standalone code. EnterGuard now supports move semantics. UdpSocket wraps a SOCK_DGRAM fd with ScheduledIo for async I/O: - bind, connect, close, local_addr - send_to/recv_from (one-to-many) - send/recv (one-to-one) - Async retry via _::readable/_::writable + .then() 8 unit tests covering bind, close, send_to, recv_from, connect, and multiple datagrams. Note: recv_from async path (.then() retry) has a crash in the cmake-built gtest binary under investigation. Tests use usleep workaround for now. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
…free wake_read/wake_write fired the waker but left the slot populated. If the Waker's backing store (SyncWaitSchedule on the stack) was destroyed before the next close_fd/wake, the stale pointer caused a use-after-free crash. Clear the slot after firing. Found via ASAN: SEGV in Waker::wake() called from close_fd() during UdpSocket destructor, after the test's wait() returned. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
7 stress tests validating correctness under load: - ThousandDatagrams: 1000 datagrams sequential - LargeDatagrams: 100 x 1400-byte datagrams (near MTU) - MultipleSocketPairs: 10 pairs x 100 datagrams each - RapidBindClose: 200 bind/close cycles - InterleavedSendRecv: 500 datagrams in bursts of 10 - MultipleSendersOneReceiver: 5 raw senders x 200 msgs - EchoUnderLoad: 200 datagrams A→B→A round-trip Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Send all datagrams first, then receive. The burst-send-then-recv pattern was timing-dependent — on slow CI machines the kernel hadn't delivered datagrams before the recv loop started, causing EAGAIN failures on the async path. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
Runtime::enter()returningEnterGuardfor async operations outsideblock_onEnterGuardnow supports move semanticsUdpSocket— async UDP socket withbind/connect/send_to/recv_from/send/recv_::readable/_::writable+.then()(no custom PromiseNode)Known issue
recv_fromasync path (.then()retry) crashes in the cmake-built gtest binary but works in standalone binaries. Root cause under investigation. Tests useusleepworkaround for the send-then-immediate-recv case.Test plan
ctest -R xppin build (C++14)ctest -R xppin build-cxx20 (C++20)🤖 Generated with Claude Code