Got cgi script to work

[progcomp2013.git] / qchess / src / player.py

diff --git a/qchess/src/player.py b/qchess/src/player.py
index 1f40066..346674b 100644 (file)
--- a/qchess/src/player.py
+++ b/qchess/src/player.py
@@ -38,10 +38,15 @@ def open_fifo(name, mode, timeout=None):
                def __init__(self):
                        threading.Thread.__init__(self)
                        self.result = None
+                       self.exception = None
 
                        
                def run(self):          
-                       self.result = open(name, mode)
+                       try:
+                               self.result = open(name, mode)
+                       except Exception, e:
+                               self.exception = e
+                               self.result = None
                
 
        w = Worker()
@@ -51,16 +56,22 @@ def open_fifo(name, mode, timeout=None):
        while time.time() - start < timeout:
                if w.is_alive() == False:
                        w.join()
+                       if w.exception != None:
+                               raise w.exception
                        return w.result
                time.sleep(0.1)
        
        
        if w.is_alive():
                #sys.stderr.write("FIFO_TIMEOUT!\n")
-               if mode == "r":
-                       f = open(name, "w")
-               else:
-                       f = open(name, "r")
+               # Recursive to deal with possible race condition
+               try:
+                       if mode == "r":
+                               f = open_fifo(name, "w", 1)
+                       else:
+                               f = open_fifo(name, "r", 1)
+               except:
+                       pass
                        
                #sys.stderr.write("Opened other end!\n")
                while w.is_alive():
@@ -72,6 +83,8 @@ def open_fifo(name, mode, timeout=None):
                raise Exception("FIFO_TIMEOUT")
        else:
                w.join()
+               if w.exception != None:
+                       raise w.exception
                return w.result