fixed cron deadlock on windows, thanks Helko Besemann

gluon/newcron.py

@@ -117,6 +117,10 @@ class Token(object):
         if a cron job started before 60 seconds and did not stop,
         a warning is issue "Stale cron.master detected"
         """
+        if sys.platform == 'win32':
+            locktime = 59.5
+        else:
+            locktime = 59.99
         if portalocker.LOCK_EX is None:
             logger.warning('WEB2PY CRON: Disabled because no file locking')
             return None
@@ -128,7 +132,7 @@ class Token(object):
                 (start, stop) = cPickle.load(self.master)
             except:
                 (start, stop) = (0, 1)
-            if startup or self.now - start > 59.99:
+            if startup or self.now - start > locktime:
                 ret = self.now
                 if not stop:
                     # this happens if previous cron job longer than 1 minute
@@ -136,6 +140,7 @@ class Token(object):
                 logger.debug('WEB2PY CRON: Acquiring lock')
                 self.master.seek(0)
                 cPickle.dump((self.now, 0), self.master)
+                self.master.flush()
         finally:
             portalocker.unlock(self.master)
         if not ret:
@@ -304,7 +309,11 @@ def crondance(applications_parent, ctype='soft', startup=False, apps=None):
         for task in tasks:
             if _cron_stopping:
                 break
-            commands = [sys.executable]
+            if sys.executable.lower().endswith('pythonservice.exe'):
+                _python_exe = os.path.join(sys.exec_prefix, 'python.exe')
+            else:
+                _python_exe = sys.executable
+            commands = [_python_exe]
             w2p_path = fileutils.abspath('web2py.py', gluon=True)
             if os.path.exists(w2p_path):
                 commands.append(w2p_path)