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 …
Signals
How Go Handles Signals and Context Cancellation Without Losing Signals
Signals land on a thread with a managed signal mask, get bit-packed into a lock-free queue by sigsend, and are forwarded to your channel by one goroutine; context cancellation is a …
How Go's CPU Profiler Works: SIGPROF, the Signal Stack and 100 Hz Sampling
A 100 Hz setitimer(ITIMER_PROF) raises SIGPROF, the handler runs on the gsignal stack, unwinds the running goroutine, and writes samples into a lock-free profBuf ring that …