Make local lazy values thread-safe.

is now guaranteed to be initialized at most once, even when accessed
from different threads. Closes #3007, review by odersky.

1 files changed, 17 insertions, 0 deletions

diff --git a/test/files/run/lazy-concurrent.scala b/test/files/run/lazy-concurrent.scala
new file mode 100644
index 0000000000..4699ed6a15
--- /dev/null
+++ b/test/files/run/lazy-concurrent.scala
@@ -0,0 +1,17 @@
+object Test {
+  def main(args: Array[String]) {
+    class Singleton {
+      val field = ()
+      println("Initializing singleton.")
+    }
+    lazy val Singleton = new Singleton
+
+    var i = 0
+    while (i < 4) {
+      new Thread(new Runnable {
+        def run = Singleton.field
+      }).start
+      i += 1
+    }
+  }
+}