Go m struct

type m struct {
	g0      *g     // goroutine with scheduling stack
	morebuf gobuf  // gobuf arg to morestack
	divmod  uint32 // div/mod denominator for arm - known to liblink

	// Fields not known to debuggers.
	procid        uint64     // for debuggers, but offset not hard-coded
	gsignal       *g         // signal-handling g
	sigmask       sigset     // storage for saved signal mask
	tls           [6]uintptr // thread-local storage (for x86 extern register)
	mstartfn      func()
	curg          *g       // current running goroutine
	caughtsig     guintptr // goroutine running during fatal signal
	p             puintptr // attached p for executing go code (nil if not executing go code)
	nextp         puintptr
	id            int32
	mallocing     int32
	throwing      int32
	preemptoff    string // if != "", keep curg running on this m
	locks         int32
	softfloat     int32
	dying         int32
	profilehz     int32
	helpgc        int32
	spinning      bool // m is out of work and is actively looking for work
	blocked       bool // m is blocked on a note
	inwb          bool // m is executing a write barrier
	newSigstack   bool // minit on C thread called sigaltstack
	printlock     int8
	incgo         bool // m is executing a cgo call
	fastrand      uint32
	ncgocall      uint64      // number of cgo calls in total
	ncgo          int32       // number of cgo calls currently in progress
	cgoCallersUse uint32      // if non-zero, cgoCallers in use temporarily
	cgoCallers    *cgoCallers // cgo traceback if crashing in cgo call
	park          note
	alllink       *m // on allm
	schedlink     muintptr
	mcache        *mcache
	lockedg       *g
	createstack   [32]uintptr // stack that created this thread.
	freglo        [16]uint32  // d[i] lsb and f[i]
	freghi        [16]uint32  // d[i] msb and f[i+16]
	fflag         uint32      // floating point compare flags
	locked        uint32      // tracking for lockosthread
	nextwaitm     uintptr     // next m waiting for lock
	needextram    bool
	traceback     uint8
	waitunlockf   unsafe.Pointer // todo go func(*g, unsafe.pointer) bool
	waitlock      unsafe.Pointer
	waittraceev   byte
	waittraceskip int
	startingtrace bool
	syscalltick   uint32
	thread        uintptr // thread handle

	// these are here because they are too large to be on the stack
	// of low-level NOSPLIT functions.
	libcall   libcall
	libcallpc uintptr // for cpu profiler
	libcallsp uintptr
	libcallg  guintptr
	syscall   libcall // stores syscall parameters on windows

	mOS
}