libgo: update to Go1.12beta2

    
    Reviewed-on: https://go-review.googlesource.com/c/158019

gotools/:
	* Makefile.am (go_cmd_vet_files): Update for Go1.12beta2 release.
	(GOTOOLS_TEST_TIMEOUT): Increase to 600.
	(check-runtime): Export LD_LIBRARY_PATH before computing GOARCH
	and GOOS.
	(check-vet): Copy golang.org/x/tools into check-vet-dir.
	* Makefile.in: Regenerate.

gcc/testsuite/:
	* go.go-torture/execute/names-1.go: Stop using debug/xcoff, which
	is no longer externally visible.

From-SVN: r268084

1 files changed, 35 insertions, 32 deletions

diff --git a/libgo/go/runtime/time.go b/libgo/go/runtime/time.go
index ea61baa..71e7556 100644
--- a/libgo/go/runtime/time.go
+++ b/libgo/go/runtime/time.go
@@ -7,7 +7,7 @@
 package runtime
 
 import (
-	"runtime/internal/sys"
+	"internal/cpu"
 	"unsafe"
 )
 
@@ -50,7 +50,7 @@ var timers [timersLen]struct {
 
 	// The padding should eliminate false sharing
 	// between timersBucket values.
-	pad [sys.CacheLineSize - unsafe.Sizeof(timersBucket{})%sys.CacheLineSize]byte
+	pad [cpu.CacheLinePadSize - unsafe.Sizeof(timersBucket{})%cpu.CacheLinePadSize]byte
 }
 
 func (t *timer) assignBucket() *timersBucket {
@@ -156,7 +156,7 @@ func (tb *timersBucket) addtimerLocked(t *timer) bool {
 	}
 	if t.i == 0 {
 		// siftup moved to top: new earliest deadline.
-		if tb.sleeping {
+		if tb.sleeping && tb.sleepUntil > t.when {
 			tb.sleeping = false
 			notewakeup(&tb.waitnote)
 		}
@@ -164,11 +164,11 @@ func (tb *timersBucket) addtimerLocked(t *timer) bool {
 			tb.rescheduling = false
 			goready(tb.gp, 0)
 		}
-	}
-	if !tb.created {
-		tb.created = true
-		expectSystemGoroutine()
-		go timerproc(tb)
+		if !tb.created {
+			tb.created = true
+			expectSystemGoroutine()
+			go timerproc(tb)
+		}
 	}
 	return true
 }
@@ -188,14 +188,22 @@ func deltimer(t *timer) bool {
 	tb := t.tb
 
 	lock(&tb.lock)
+	removed, ok := tb.deltimerLocked(t)
+	unlock(&tb.lock)
+	if !ok {
+		badTimer()
+	}
+	return removed
+}
+
+func (tb *timersBucket) deltimerLocked(t *timer) (removed, ok bool) {
 	// t may not be registered anymore and may have
 	// a bogus i (typically 0, if generated by Go).
 	// Verify it before proceeding.
 	i := t.i
 	last := len(tb.t) - 1
 	if i < 0 || i > last || tb.t[i] != t {
-		unlock(&tb.lock)
-		return false
+		return false, true
 	}
 	if i != last {
 		tb.t[i] = tb.t[last]
@@ -203,7 +211,7 @@ func deltimer(t *timer) bool {
 	}
 	tb.t[last] = nil
 	tb.t = tb.t[:last]
-	ok := true
+	ok = true
 	if i != last {
 		if !siftupTimer(tb.t, i) {
 			ok = false
@@ -212,11 +220,26 @@ func deltimer(t *timer) bool {
 			ok = false
 		}
 	}
+	return true, ok
+}
+
+func modtimer(t *timer, when, period int64, f func(interface{}, uintptr), arg interface{}, seq uintptr) {
+	tb := t.tb
+
+	lock(&tb.lock)
+	_, ok := tb.deltimerLocked(t)
+	if ok {
+		t.when = when
+		t.period = period
+		t.f = f
+		t.arg = arg
+		t.seq = seq
+		ok = tb.addtimerLocked(t)
+	}
 	unlock(&tb.lock)
 	if !ok {
 		badTimer()
 	}
-	return true
 }
 
 // Timerproc runs the time-driven events.
@@ -438,23 +461,3 @@ func siftdownTimer(t []*timer, i int) bool {
 func badTimer() {
 	panic(errorString("racy use of timers"))
 }
-
-// Entry points for net, time to call nanotime.
-
-//go:linkname poll_runtimeNano internal..z2fpoll.runtimeNano
-func poll_runtimeNano() int64 {
-	return nanotime()
-}
-
-//go:linkname time_runtimeNano time.runtimeNano
-func time_runtimeNano() int64 {
-	return nanotime()
-}
-
-// Monotonic times are reported as offsets from startNano.
-// We initialize startNano to nanotime() - 1 so that on systems where
-// monotonic time resolution is fairly low (e.g. Windows 2008
-// which appears to have a default resolution of 15ms),
-// we avoid ever reporting a nanotime of 0.
-// (Callers may want to use 0 as "time not set".)
-var startNano int64 = nanotime() - 1