libgo: update to go1.7rc3

Reviewed-on: https://go-review.googlesource.com/25150

From-SVN: r238662

libgo/go/runtime/export_test.go

@@ -1,4 +1,4 @@
-// Copyright 2010 The Go Authors.  All rights reserved.
+// Copyright 2010 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
@@ -117,6 +117,113 @@ func Close(fd int32) int32 {
 	return close(fd)
 }
 
+/*
+func RunSchedLocalQueueTest() {
+	_p_ := new(p)
+	gs := make([]g, len(_p_.runq))
+	for i := 0; i < len(_p_.runq); i++ {
+		if g, _ := runqget(_p_); g != nil {
+			throw("runq is not empty initially")
+		}
+		for j := 0; j < i; j++ {
+			runqput(_p_, &gs[i], false)
+		}
+		for j := 0; j < i; j++ {
+			if g, _ := runqget(_p_); g != &gs[i] {
+				print("bad element at iter ", i, "/", j, "\n")
+				throw("bad element")
+			}
+		}
+		if g, _ := runqget(_p_); g != nil {
+			throw("runq is not empty afterwards")
+		}
+	}
+}
+
+func RunSchedLocalQueueStealTest() {
+	p1 := new(p)
+	p2 := new(p)
+	gs := make([]g, len(p1.runq))
+	for i := 0; i < len(p1.runq); i++ {
+		for j := 0; j < i; j++ {
+			gs[j].sig = 0
+			runqput(p1, &gs[j], false)
+		}
+		gp := runqsteal(p2, p1, true)
+		s := 0
+		if gp != nil {
+			s++
+			gp.sig++
+		}
+		for {
+			gp, _ = runqget(p2)
+			if gp == nil {
+				break
+			}
+			s++
+			gp.sig++
+		}
+		for {
+			gp, _ = runqget(p1)
+			if gp == nil {
+				break
+			}
+			gp.sig++
+		}
+		for j := 0; j < i; j++ {
+			if gs[j].sig != 1 {
+				print("bad element ", j, "(", gs[j].sig, ") at iter ", i, "\n")
+				throw("bad element")
+			}
+		}
+		if s != i/2 && s != i/2+1 {
+			print("bad steal ", s, ", want ", i/2, " or ", i/2+1, ", iter ", i, "\n")
+			throw("bad steal")
+		}
+	}
+}
+
+func RunSchedLocalQueueEmptyTest(iters int) {
+	// Test that runq is not spuriously reported as empty.
+	// Runq emptiness affects scheduling decisions and spurious emptiness
+	// can lead to underutilization (both runnable Gs and idle Ps coexist
+	// for arbitrary long time).
+	done := make(chan bool, 1)
+	p := new(p)
+	gs := make([]g, 2)
+	ready := new(uint32)
+	for i := 0; i < iters; i++ {
+		*ready = 0
+		next0 := (i & 1) == 0
+		next1 := (i & 2) == 0
+		runqput(p, &gs[0], next0)
+		go func() {
+			for atomic.Xadd(ready, 1); atomic.Load(ready) != 2; {
+			}
+			if runqempty(p) {
+				println("next:", next0, next1)
+				throw("queue is empty")
+			}
+			done <- true
+		}()
+		for atomic.Xadd(ready, 1); atomic.Load(ready) != 2; {
+		}
+		runqput(p, &gs[1], next1)
+		runqget(p)
+		<-done
+		runqget(p)
+	}
+}
+
+var StringHash = stringHash
+var BytesHash = bytesHash
+var Int32Hash = int32Hash
+var Int64Hash = int64Hash
+var EfaceHash = efaceHash
+var IfaceHash = ifaceHash
+var MemclrBytes = memclrBytes
+*/
+
 //extern read
 func read(fd int32, buf unsafe.Pointer, size int32) int32
 
@@ -181,3 +288,24 @@ var ForceGCPeriod = &forcegcperiod
 // the "environment" traceback level, so later calls to
 // debug.SetTraceback (e.g., from testing timeouts) can't lower it.
 func SetTracebackEnv(level string)
+
+/*
+var ReadUnaligned32 = readUnaligned32
+var ReadUnaligned64 = readUnaligned64
+
+func CountPagesInUse() (pagesInUse, counted uintptr) {
+	stopTheWorld("CountPagesInUse")
+
+	pagesInUse = uintptr(mheap_.pagesInUse)
+
+	for _, s := range h_allspans {
+		if s.state == mSpanInUse {
+			counted += s.npages
+		}
+	}
+
+	startTheWorld()
+
+	return
+}
+*/