Added FlatCAMWorker.py

FlatCAMWorker.py

@@ -0,0 +1,43 @@
+############################################################
+# FlatCAM: 2D Post-processing for Manufacturing            #
+# http://caram.cl/software/flatcam                         #
+# Author: Juan Pablo Caram (c)                             #
+# Date: 2/5/2014                                           #
+# MIT Licence                                              #
+############################################################
+
+import threading
+import Queue
+
+
+class Worker(threading.Thread):
+    """
+    Implements a queue of tasks to be carried out in order
+    in a single independent thread.
+    """
+
+    def __init__(self):
+        super(Worker, self).__init__()
+        self.queue = Queue.Queue()
+        self.stoprequest = threading.Event()
+
+    def run(self):
+        while not self.stoprequest.isSet():
+            try:
+                task = self.queue.get(True, 0.05)
+                self.do_task(task)
+            except Queue.Empty:
+                continue
+
+    @staticmethod
+    def do_task(task):
+        task['fcn'](*task['params'])
+        return
+
+    def add_task(self, target, params=list()):
+        self.queue.put({'fcn': target, 'params': params})
+        return
+
+    def join(self, timeout=None):
+        self.stoprequest.set()
+        super(Worker, self).join()