runtime: merge common sleep() functions

src/runtime/runtime.go

@@ -115,3 +115,8 @@ func sliceCopy(dst, src unsafe.Pointer, dstLen, srcLen lenType, elemSize uintptr
 	memmove(dst, src, uintptr(n)*elemSize)
 	return n
 }
+
+//go:linkname sleep time.Sleep
+func sleep(d int64) {
+	sleepTicks(timeUnit(d / tickMicros))
+}

src/runtime/runtime_avr.go

@@ -68,15 +68,10 @@ func putchar(c byte) {
 	*avr.UDR0 = avr.RegValue(c) // send char
 }
 
-// Sleep by the given amount.
+// Sleep this number of ticks of 16ms.
 //
 // TODO: not very accurate. Improve accuracy by calibrating on startup and every
 // once in a while.
-//go:linkname sleep time.Sleep
-func sleep(d int64) {
-	sleepTicks(timeUnit(d / tickMicros))
-}
-
 func sleepTicks(d timeUnit) {
 	currentTime += d
 	for d != 0 {

src/runtime/runtime_nrf.go

@@ -91,11 +91,6 @@ func putchar(c byte) {
 	nrf.UART0.EVENTS_TXDRDY = 0
 }
 
-//go:linkname sleep time.Sleep
-func sleep(d timeUnit) {
-	sleepTicks(d / tickMicros)
-}
-
 func sleepTicks(d timeUnit) {
 	for d != 0 {
 		ticks()                       // update timestamp

src/runtime/runtime_unix.go

@@ -34,13 +34,8 @@ func putchar(c byte) {
 	_Cfunc_putchar(int(c))
 }
 
-//go:linkname sleep time.Sleep
-func sleep(d int64) {
-	_Cfunc_usleep(uint(d) / 1000)
-}
-
 func sleepTicks(d timeUnit) {
-	sleep(int64(d))
+	_Cfunc_usleep(uint(d) / 1000)
 }
 
 // Return monotonic time in nanoseconds.