squash merge from dev branch

vendor/go.uber.org/atomic/stress_test.go

@@ -0,0 +1,140 @@
+// Copyright (c) 2016 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import (
+	"runtime"
+	"sync"
+	"testing"
+)
+
+const (
+	_parallelism = 4
+	_iterations  = 1000
+)
+
+func runStress(f func()) {
+	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(_parallelism))
+
+	var wg sync.WaitGroup
+	wg.Add(_parallelism)
+	for i := 0; i < _parallelism; i++ {
+		go func() {
+			defer wg.Done()
+			for j := 0; j < _iterations; j++ {
+				f()
+			}
+		}()
+	}
+
+	wg.Wait()
+}
+
+func TestStressInt32(t *testing.T) {
+	var atom Int32
+	runStress(func() {
+		atom.Load()
+		atom.Add(1)
+		atom.Sub(2)
+		atom.Inc()
+		atom.Dec()
+		atom.CAS(1, 0)
+		atom.Swap(5)
+		atom.Store(1)
+	})
+}
+
+func TestStressInt64(t *testing.T) {
+	var atom Int64
+	runStress(func() {
+		atom.Load()
+		atom.Add(1)
+		atom.Sub(2)
+		atom.Inc()
+		atom.Dec()
+		atom.CAS(1, 0)
+		atom.Swap(5)
+		atom.Store(1)
+
+	})
+}
+
+func TestStressUint32(t *testing.T) {
+	var atom Uint32
+	runStress(func() {
+		atom.Load()
+		atom.Add(1)
+		atom.Sub(2)
+		atom.Inc()
+		atom.Dec()
+		atom.CAS(1, 0)
+		atom.Swap(5)
+		atom.Store(1)
+	})
+}
+
+func TestStressUint64(t *testing.T) {
+	var atom Uint64
+	runStress(func() {
+		atom.Load()
+		atom.Add(1)
+		atom.Sub(2)
+		atom.Inc()
+		atom.Dec()
+		atom.CAS(1, 0)
+		atom.Swap(5)
+		atom.Store(1)
+	})
+}
+
+func TestStressFloat64(t *testing.T) {
+	var atom Float64
+	runStress(func() {
+		atom.Load()
+		atom.CAS(1.0, 0.1)
+		atom.Add(1.1)
+		atom.Sub(0.2)
+		atom.Store(1.0)
+	})
+}
+
+func TestStressBool(t *testing.T) {
+	var atom Bool
+	runStress(func() {
+		atom.Load()
+		atom.Store(false)
+		atom.Swap(true)
+		atom.Load()
+		atom.Toggle()
+		atom.Toggle()
+	})
+}
+
+func TestStressString(t *testing.T) {
+	var atom String
+	runStress(func() {
+		atom.Load()
+		atom.Store("abc")
+		atom.Load()
+		atom.Store("def")
+
+	})
+}