From 57ae1f30b2c6e8f705eea796cd3b36932049b5aa Mon Sep 17 00:00:00 2001
From: Viktor Klang <viktor.klang@gmail.com>
Date: Thu, 3 Jan 2013 14:04:20 +0100
Subject: SI-6905 - Switch to sneakyThrows instead of Unsafe.throwException as
 per new jsr166y to avoid issues with Android

---
 .../scala/concurrent/forkjoin/ForkJoinPool.java    |  2 +-
 .../scala/concurrent/forkjoin/ForkJoinTask.java    | 30 +++++++++++++++++++---
 2 files changed, 28 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/forkjoin/scala/concurrent/forkjoin/ForkJoinPool.java b/src/forkjoin/scala/concurrent/forkjoin/ForkJoinPool.java
index 65654be69b..8dbca6da4b 100644
--- a/src/forkjoin/scala/concurrent/forkjoin/ForkJoinPool.java
+++ b/src/forkjoin/scala/concurrent/forkjoin/ForkJoinPool.java
@@ -1372,7 +1372,7 @@ public class ForkJoinPool extends AbstractExecutorService {
         }
 
         if (ex != null)                     // rethrow
-            U.throwException(ex);
+            ForkJoinTask.rethrow(ex);
     }
 
 
diff --git a/src/forkjoin/scala/concurrent/forkjoin/ForkJoinTask.java b/src/forkjoin/scala/concurrent/forkjoin/ForkJoinTask.java
index 15c60118b3..839fd26b39 100644
--- a/src/forkjoin/scala/concurrent/forkjoin/ForkJoinTask.java
+++ b/src/forkjoin/scala/concurrent/forkjoin/ForkJoinTask.java
@@ -595,6 +595,30 @@ public abstract class ForkJoinTask<V> implements Future<V>, Serializable {
             }
         }
     }
+    
+    /**
+     * A version of "sneaky throw" to relay exceptions
+     */
+    static void rethrow(final Throwable ex) {
+        if (ex != null) {
+            if (ex instanceof Error)
+                throw (Error)ex;
+            if (ex instanceof RuntimeException)
+                throw (RuntimeException)ex;
+            ForkJoinTask.<RuntimeException>uncheckedThrow(ex);
+        }
+    }
+
+    /**
+     * The sneaky part of sneaky throw, relying on generics
+     * limitations to evade compiler complaints about rethrowing
+     * unchecked exceptions
+     */
+    @SuppressWarnings("unchecked") static <T extends Throwable>
+        void uncheckedThrow(Throwable t) throws T {
+        if (t != null)
+            throw (T)t; // rely on vacuous cast
+    }
 
     /**
      * Throws exception, if any, associated with the given status.
@@ -604,7 +628,7 @@ public abstract class ForkJoinTask<V> implements Future<V>, Serializable {
                         (s == EXCEPTIONAL) ? getThrowableException() :
                         null);
         if (ex != null)
-            U.throwException(ex);
+            ForkJoinTask.rethrow(ex);
     }
 
     // public methods
@@ -742,7 +766,7 @@ public abstract class ForkJoinTask<V> implements Future<V>, Serializable {
             }
         }
         if (ex != null)
-            U.throwException(ex);
+            ForkJoinTask.rethrow(ex);
     }
 
     /**
@@ -799,7 +823,7 @@ public abstract class ForkJoinTask<V> implements Future<V>, Serializable {
             }
         }
         if (ex != null)
-            U.throwException(ex);
+            ForkJoinTask.rethrow(ex);
         return tasks;
     }
 
-- 
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