changed callback mechanism to make it more flexible, also added callback

on close().

ZServer/PubCore/ZOutPipe.py

@@ -7,8 +7,12 @@ from string import join
 TupleType=type(())
 
 class OutputPipe:
+    """A pipe which can be written to and read from different threads.
+    Also supports callbacks to notify readers when the pipe has been
+    written to or has been closed."""
 
     def __init__(self,callback=None):
+        "callback should be a tuple (function,(args,))"
         lock=thread.allocate_lock()
         self._r=lock.release
         self._a=lock.acquire
@@ -20,7 +24,15 @@ class OutputPipe:
         try:
             self._buf.append(text)
         finally: self._r()
-        Wakeup(self._callback)
+        self.notify()
+
+    def notify(self):
+        if self._callback:
+            fun=self._callback[0]
+            args=self._callback[1]+(self,)
+            Wakeup(lambda f=fun,a=args: apply(f,a))
+        else:
+            Wakeup()
 
     def close(self):
         self._a()
@@ -29,14 +41,14 @@ class OutputPipe:
             if b: self._buf=tuple(b)
             else: self._buf=None
         finally: self._r()
-        
+        self.notify()
+
     def read(self):
         """Read data from the pipe
 
         Return None if the pipe is open but has no data.
         Return an empty string if the pipe is closed.
         """
-        print "read from pipe"
         self._a()
         try:
             b=self._buf

lib/python/ZServer/PubCore/ZOutPipe.py

@@ -7,8 +7,12 @@ from string import join
 TupleType=type(())
 
 class OutputPipe:
+    """A pipe which can be written to and read from different threads.
+    Also supports callbacks to notify readers when the pipe has been
+    written to or has been closed."""
 
     def __init__(self,callback=None):
+        "callback should be a tuple (function,(args,))"
         lock=thread.allocate_lock()
         self._r=lock.release
         self._a=lock.acquire
@@ -20,7 +24,15 @@ class OutputPipe:
         try:
             self._buf.append(text)
         finally: self._r()
-        Wakeup(self._callback)
+        self.notify()
+
+    def notify(self):
+        if self._callback:
+            fun=self._callback[0]
+            args=self._callback[1]+(self,)
+            Wakeup(lambda f=fun,a=args: apply(f,a))
+        else:
+            Wakeup()
 
     def close(self):
         self._a()
@@ -29,14 +41,14 @@ class OutputPipe:
             if b: self._buf=tuple(b)
             else: self._buf=None
         finally: self._r()
-        
+        self.notify()
+
     def read(self):
         """Read data from the pipe
 
         Return None if the pipe is open but has no data.
         Return an empty string if the pipe is closed.
         """
-        print "read from pipe"
         self._a()
         try:
             b=self._buf