Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/src/runtime/proc_runtime_test.go b/src/runtime/proc_runtime_test.go
new file mode 100644
index 0000000..90aed83
--- /dev/null
+++ b/src/runtime/proc_runtime_test.go
@@ -0,0 +1,50 @@
+// Copyright 2016 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.
+
+// Proc unit tests. In runtime package so can use runtime guts.
+
+package runtime
+
+func RunStealOrderTest() {
+	var ord randomOrder
+	for procs := 1; procs <= 64; procs++ {
+		ord.reset(uint32(procs))
+		if procs >= 3 && len(ord.coprimes) < 2 {
+			panic("too few coprimes")
+		}
+		for co := 0; co < len(ord.coprimes); co++ {
+			enum := ord.start(uint32(co))
+			checked := make([]bool, procs)
+			for p := 0; p < procs; p++ {
+				x := enum.position()
+				if checked[x] {
+					println("procs:", procs, "inc:", enum.inc)
+					panic("duplicate during enumeration")
+				}
+				checked[x] = true
+				enum.next()
+			}
+			if !enum.done() {
+				panic("not done")
+			}
+		}
+	}
+	// Make sure that different arguments to ord.start don't generate the
+	// same pos+inc twice.
+	for procs := 2; procs <= 64; procs++ {
+		ord.reset(uint32(procs))
+		checked := make([]bool, procs*procs)
+		// We want at least procs*len(ord.coprimes) different pos+inc values
+		// before we start repeating.
+		for i := 0; i < procs*len(ord.coprimes); i++ {
+			enum := ord.start(uint32(i))
+			j := enum.pos*uint32(procs) + enum.inc
+			if checked[j] {
+				println("procs:", procs, "pos:", enum.pos, "inc:", enum.inc)
+				panic("duplicate pos+inc during enumeration")
+			}
+			checked[j] = true
+		}
+	}
+}