Module runtime 

Goroutine scheduler internals.

Ported from src/runtime/ in https://github.com/golang/go. Each submodule maps to the Go source file(s) shown below.

v0.2.0 additions

New module / symbol	Purpose
stack — newstack, copystack, sigsegv_handler	Dynamic goroutine stack growth (Step 3)
m — pthread_id, setup_sigaltstack	Per-M thread ID + 64 KiB alternate signal stack (Step 4)
sched — async_preempt2, sigurg_handler	Non-cooperative goroutine preemption via SIGURG (Step 4)
asm_amd64/asm_arm64 — async_preempt_trampoline	Save/restore all registers around the preemption yield (Step 4)
sysmon — pthread_kill(SIGURG) in preemptone	Signal delivery for async preemption (Step 4)
netpoll	epoll (Linux) / kqueue (macOS) / IOCP (Windows) I/O backend (Step 5)

v0.3.0 additions

New module / symbol	Purpose
g — casgstatus, castogscanstatus, casfrom_gscanstatus, readgstatus	Centralised atomic G state-transition helpers (mirrors Go’s casgstatus)
g — scan_stack	GSCAN freeze/unfreeze scaffolding for a future GC stack scanner
syscall — entersyscall/exitsyscall	G transitions to/from GSYSCALL state
stack — copystack	G transitions through GCOPYSTACK during stack-copy
sched — preemptm	G transitions through GPREEMPTED (Go 1.14+ async-preempt protocol)
park — goready	Accepts GPREEMPTED as well as GWAITING when readying a G
asm_amd64/asm_arm64 — systemstack, systemstack_call	Runs a closure on the M’s g0 stack via a naked RSP/SP switch

This module	Go source
g	runtime/runtime2.go
m	runtime/runtime2.go, runtime/proc.go
p	runtime/runtime2.go, runtime/proc.go
sched	runtime/proc.go, runtime/preempt.go
stack	runtime/stack.go, runtime/signal_unix.go
netpoll	runtime/netpoll_epoll.go, runtime/netpoll_kqueue.go, runtime/netpoll_windows.go
park	runtime/proc.go (gopark / goready)
sudog	runtime/runtime2.go, runtime/proc.go
syscall	runtime/proc.go (entersyscall / exitsyscall)
sysmon	runtime/proc.go (sysmon / retake)
time	runtime/time.go
asm_amd64	runtime/asm_amd64.s, runtime/preempt_amd64.s
asm_arm64	runtime/asm_arm64.s, runtime/preempt_arm64.s