[gnome-games] Sudoku: Only allow autosolver to start if it is not already running

[Thomas Hindoe Paaboel Andersen <thomashpa src gnome org>]

commit 212f40519e29d7afad05cd307980acfd2b355e60
Author: Thomas Hindoe Paaboel Andersen <phomes gmail com>
Date:   Fri Apr 9 22:58:23 2010 +0200

    Sudoku: Only allow autosolver to start if it is not already running
    
    Patch by ultramancool gmail com
    
    GNOME bug #433521

 gnome-sudoku/src/lib/sudoku.py |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gnome-sudoku/src/lib/sudoku.py b/gnome-sudoku/src/lib/sudoku.py
index c05d2a8..aa4fda2 100644
--- a/gnome-sudoku/src/lib/sudoku.py
+++ b/gnome-sudoku/src/lib/sudoku.py
@@ -296,6 +296,7 @@ class SudokuSolver (SudokuGrid):
         self.backtraces = 0
         self.initialized = True
         self.solved = False
+        self.solving = False
         self.trail = []
 
     def auto_fill_for_xy (self, x, y):
@@ -390,11 +391,15 @@ class SudokuSolver (SudokuGrid):
         return retval
 
     def solve (self):
+        if self.solving:
+            return
+        self.solving = True
         self.auto_fill()
         while not self.guess_least_open_square():
             pass
         if self.verbose:
             print 'Solved!\n', self
+        self.solving = False
         self.solved = True
 
     def solution_finder (self):