Go Preempts Goroutines with a Signal: Asynchronous Preemption Since Go 1.14
Go preempts goroutines cooperatively by poisoning the stack bound and asynchronously with SIGURG; the signal handler checks PCDATA_UnsafePoint before injecting a call to …
Go
Go Removes Interface Calls With PGO: Devirtualization and Inlining Hot Call Sites
A PGO profile tells the Go compiler which concrete type dominates each interface call site; the compiler then rewrites the call as a type-assert plus direct call, falling back to …
Go's Atomics and the Memory Model: What sync/atomic Actually Guarantees
sync/atomic is sequentially consistent, the typed wrappers (Int64, Pointer[T]) exist to stop you shooting yourself in the foot, and on amd64 everything bottoms out in LOCK CMPXCHG …
Go's Build Cache: Content Hashes, Action IDs and Why Rebuilds Are Instant
Go’s build cache keys each action on a hash of its inputs and stores the output under a hash of its contents, so a rebuild that changes nothing runs no compiler at all.
Go's defer and panic: Open-Coded Defers and the Runtime's Unwind Loop
Go compiles a defer three different ways depending on where it appears, and the panic runtime unwinds those three shapes separately.