mp.printlock++
	if mp.printlock == 1 {
		lock(&debuglock)
	}
	mp.locks-- // now we know debuglock is held and holding up mp.locks for us.
}

func printunlock() {
	mp := getg().m
	mp.printlock--
	if mp.printlock == 0 {
		unlock(&debuglock)
	}
}

// write to goroutine-local buffer if diverting output,
// or else standard error.
func gwrite(b []byte) {

package runtime

import "unsafe"

var (
	writeHeader = []byte{6 /* ANDROID_LOG_ERROR */, 'G', 'o', 0}
	writePath   = []byte("/dev/log/main\x00")
	writeLogd   = []byte("/dev/socket/logdw\x00")

	// guarded by printlock/printunlock.
	writeFD  uintptr
	writeBuf [1024]byte
	writePos int
)

// Prior to Android-L, logging was done through writes to /dev/log files implemented

	{"runtime.printuintptr", 1},
	{"runtime.printiface", 1},
	{"runtime.printeface", 1},
	{"runtime.printslice", 1},
	{"runtime.printnl", 1},
	{"runtime.printsp", 1},
	{"runtime.printlock", 1},
	{"runtime.printunlock", 1},
	{"runtime.concatstring2", 1},
	{"runtime.concatstring3", 1},
	{"runtime.concatstring4", 1},
	{"runtime.concatstring5", 1},
	{"runtime.concatstrings", 1},
	{"runtime.cmpstring", 1},

	// the fatal panic path and this may deadlock.

	printlock()

	// Get the list of all debug logs.
	allp := (*uintptr)(unsafe.Pointer(&allDloggers))
	all := (*dlogger)(unsafe.Pointer(atomic.Loaduintptr(allp)))

	// Count the logs.
	n := 0
	for l := all; l != nil; l = l.allLink {
		n++
	}
	if n == 0 {
		printunlock()
		return
	}

	// Prepare read state for all logs.

func printstring(string)
func printpointer(any)
func printuintptr(uintptr)
func printiface(any)
func printeface(any)
func printslice(any)
func printnl()
func printsp()
func printlock()
func printunlock()

func concatstring2(*[32]byte, string, string) string
func concatstring3(*[32]byte, string, string, string) string
func concatstring4(*[32]byte, string, string, string, string) string

	{"printuintptr", funcTag, 31},
	{"printiface", funcTag, 30},
	{"printeface", funcTag, 30},
	{"printslice", funcTag, 30},
	{"printnl", funcTag, 9},
	{"printsp", funcTag, 9},
	{"printlock", funcTag, 9},
	{"printunlock", funcTag, 9},
	{"concatstring2", funcTag, 34},
	{"concatstring3", funcTag, 35},
	{"concatstring4", funcTag, 36},
	{"concatstring5", funcTag, 37},
	{"concatstrings", funcTag, 39},

	0x001d 00029 (x.go:4)	PCDATA	$0, $0
	0x001d 00029 (x.go:4)	PCDATA	$1, $0
	0x001d 00029 (x.go:4)	CALL	runtime.printlock(SB)
	0x0022 00034 (x.go:4)	MOVQ	$3, (SP)
	0x002a 00042 (x.go:4)	CALL	runtime.printint(SB)
	0x002f 00047 (x.go:4)	CALL	runtime.printnl(SB)
	0x0034 00052 (x.go:4)	CALL	runtime.printunlock(SB)
	0x0039 00057 (x.go:5)	MOVQ	8(SP), BP
	0x003e 00062 (x.go:5)	ADDQ	$16, SP
	0x0042 00066 (x.go:5)	RET

			continue
		}
		obj.setRecord(nil) // Don't scan it again.
		if stackTraceDebug {
			printlock()
			print("  live stkobj at", hex(state.stack.lo+uintptr(obj.off)), "of size", obj.size)
			if conservative {
				print(" (conservative)")
			}
			println()
			printunlock()
		}
		gcdata := r.gcdata()
		var s *mspan
		if r.useGCProg() {

		if params := on.Type().Params(); len(params) > 0 {
			t := params[0].Type
			n = typecheck.Conv(n, t)
			r.Args.Append(n)
		}
		calls = append(calls, r)
	}

	calls = append(calls, mkcall("printunlock", nil, init))

	typecheck.Stmts(calls)
	walkExprList(calls, init)

	r := ir.NewBlockStmt(base.Pos, nil)
	r.List = calls
	return walkStmt(typecheck.Stmt(r))
}

			gcController.globalsScan.Load()>>20, " MB globals, ",
			work.maxprocs, " P")
		if work.userForced {
			print(" (forced)")
		}
		print("\n")
		printunlock()
	}

	// Set any arena chunks that were deferred to fault.
	lock(&userArenaState.lock)
	faultList := userArenaState.fault
	userArenaState.fault = nil
	unlock(&userArenaState.lock)