bitkeeper revision 1.1717 (42b3442b7kXKhXN5lvR9spIGT5LsYQ)

When xend starts, it fires off xcs.  If you're running on a slow
machine its possible that xcs started but xend didnt wait long 
enough to notice.  The attached patch loops several times while 
waiting for xcs to come up.  It seems to be working here while the 
original is not (slow machine here).

From: Tim Newsham [newsham@lava.net]
Signed-off-by: ian@xensource.com

tools/misc/xend

@@ -86,9 +86,7 @@ def xcs_running():
     
 def start_xcs():
     if (not xcs_running()):
-        if os.fork():
-            time.sleep(0.1) # let xcs start
-        else:
+        if os.fork() == 0 :
             if not os.path.isdir(os.path.dirname(XCS_PATH)):
                 os.makedirs(os.path.dirname(XCS_PATH))
             try:
@@ -98,11 +96,15 @@ def start_xcs():
                 msg("Tried to start xcs, but failed. Is it installed?")
                 hline()
                 raise CheckError("couldn't start xcs")
-        if (not xcs_running()):
-            hline()
-            msg("Failed to start the control interface switch.")
-            hline()
-            raise CheckError("xcs not running")
+        for n in range(10) :
+            if (xcs_running()):
+                break
+            time.sleep(0.1)
+        else :
+                hline()
+                msg("Failed to start the control interface switch.")
+                hline()
+                raise CheckError("xcs not running")
             
 def stop_xcs():
     try: