.NET: Asyn http client - anatomy and traps
summary
Demonstrates compiler-generated state machines by compiling C# on SharpLab.io, builds a custom awaiter (starts a thread, sleeps, calls the registered callback) and shows it works but isn’t true non-blocking async; traces real non-blocking behavior to sockets using a socket async context loop / poll or IO completion ports plus a small thread pool that demultiplexes callbacks; shows practical traps: WhenAny returns a task reference (need to await it to observe exceptions) and WhenAll exposes only one rethrown exception unless inspected.
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chapters (7)
- 0:00Introduction and agenda
- 1:17Async/await compiler internals
- 8:48Who resumes async flow
- 11:37Custom awaitable implementation
- 26:24HTTP client async I/O mechanics
- 35:37Traps with WhenAll and WhenAny
- 41:56Summary and key takeaways
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