dsync: Fix CI

Signed-off-by: Luke Shumaker <lukeshu@datawire.io>

Author: LukeShu

dsync/borrowed_cond_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/datawire/dlib/dlog"      // MODIFIED: ADDED
 	. "github.com/datawire/dlib/dsync"   // MODIFIED: FROM: . "sync"
 	"github.com/stretchr/testify/assert" // MODIFIED: ADDED
+	"os"                                 // MODIFIED: ADDED
 	"reflect"
 	"runtime"
 	stdsync "sync" // MODIFIED: ADDED
@@ -89,6 +90,11 @@ func TestCondSignalGenerations(t *testing.T) {
 }
 
 func TestCondBroadcast(t *testing.T) {
+	if testRace && os.Getenv("CI") != "" {
+		// This test is quite slow with the race detector turned on.  Slow enough that it
+		// causes problems for CI.
+		t.SkipNow()
+	}
 	ctx := dlog.NewTestContext(t, true) // MODIFIED: ADDED
 	var m Mutex
 	c := NewCond(&m)

dsync/testutil_norace_test.go

@@ -0,0 +1,5 @@
+// +build !race
+
+package dsync_test
+
+const testRace = false

dsync/testutil_race_test.go

@@ -0,0 +1,5 @@
+// +build race
+
+package dsync_test
+
+const testRace = true