var runtime.extram

4 uses

	runtime (current package)
		proc.go#L1994: var extram uintptr
		proc.go#L2009: 		old := atomic.Loaduintptr(&extram)
		proc.go#L2025: 		if atomic.Casuintptr(&extram, old, locked) {
		proc.go#L2035: 	atomic.Storeuintptr(&extram, uintptr(unsafe.Pointer(mp)))