1 files changed, 10 insertions, 7 deletions

diff --git a/threads.js b/threads.js
index cf97362..4592e92 100644
--- a/threads.js
+++ b/threads.js
@@ -136,7 +136,8 @@ ThreadManager.prototype.toggleProcess = function (block) {
 ThreadManager.prototype.startProcess = function (
     block,
     isThreadSafe,
-    exportResult
+    exportResult,
+	callback
 ) {
     var active = this.findProcess(block),
         top = block.topBlock(),
@@ -149,7 +150,7 @@ ThreadManager.prototype.startProcess = function (
         this.removeTerminatedProcesses();
     }
     top.addHighlight();
-    newProc = new Process(block.topBlock());
+    newProc = new Process(block.topBlock(), callback);
     newProc.exportResult = exportResult;
     this.processes.push(newProc);
     return newProc;
@@ -314,6 +315,7 @@ ThreadManager.prototype.findProcess = function (block) {
                         and when the process was paused
     exportResult        boolean flag indicating whether a picture of the top
                         block along with the result bubble shoud be exported
+	callback 			a function to be executed when the process is done
 */
 
 Process.prototype = {};
@@ -321,7 +323,7 @@ Process.prototype.contructor = Process;
 Process.prototype.timeout = 500; // msecs after which to force yield
 Process.prototype.isCatchingErrors = true;
 
-function Process(topBlock) {
+function Process(topBlock, callback) {
     this.topBlock = topBlock || null;
 
     this.readyToYield = false;
@@ -338,6 +340,7 @@ function Process(topBlock) {
     this.pauseOffset = null;
     this.frameCount = 0;
     this.exportResult = false;
+	this.callback = callback;
 
     if (topBlock) {
         this.homeContext.receiver = topBlock.receiver();
@@ -435,8 +438,8 @@ Process.prototype.pauseStep = function () {
 
 Process.prototype.evaluateContext = function () {
     var exp = this.context.expression;
-
     this.frameCount += 1;
+	
     if (exp instanceof Array) {
         return this.evaluateSequence(exp);
     }
@@ -476,9 +479,9 @@ Process.prototype.evaluateBlock = function (block, argCount) {
         }
         if (this.isCatchingErrors) {
             try {
-                this.returnValueToParentContext(
-                    rcvr[block.selector].apply(rcvr, inputs)
-                );
+				var result = rcvr[block.selector].apply(rcvr, inputs);
+				if (this.callback) { this.callback(result) };
+                this.returnValueToParentContext(result);
                 this.popContext();
             } catch (error) {
                 this.handleError(error, block);