if s.state.get() == mSpanInUse {
			counted += s.npages
		}
	}

	startTheWorld(stw)

	return
}

func Fastrand() uint32          { return uint32(rand()) }
func Fastrand64() uint64        { return rand() }
func Fastrandn(n uint32) uint32 { return randn(n) }

type ProfBuf profBuf

func NewProfBuf(hdrsize, bufwords, tags int) *ProfBuf {

// convenience functions.
var globalRand = &Rand{src: runtimeSource{}}

//go:linkname runtime_rand runtime.rand
func runtime_rand() uint64

// runtimeSource is a Source that uses the runtime fastrand functions.
type runtimeSource struct{}

func (runtimeSource) Uint64() uint64 {
	return runtime_rand()
}

// Int64 returns a non-negative pseudo-random 63-bit integer as an int64

		return globalRandGenerator.Load()
	}

	return r
}

//go:linkname runtime_rand runtime.rand
func runtime_rand() uint64

// runtimeSource is an implementation of Source64 that uses the runtime
// fastrand functions.
type runtimeSource struct {
	// The mutex is used to avoid race conditions in Read.
	mu sync.Mutex
}

func (*runtimeSource) Int63() int64 {
	return int64(runtime_rand() & rngMask)
}

		{"coro_var.go", false},
		// assembly reference is not ok
		{"coro_asm", false},
		// pull-only linkname is not ok
		{"coro2.go", false},
		// legacy bad linkname is ok, for now
		{"fastrand.go", true},
		{"badlinkname.go", true},
	}
	for _, test := range tests {
		test := test
		t.Run(test.src, func(t *testing.T) {
			t.Parallel()
			src := filepath.Join("testdata", "linkname", test.src)