git » pymisc » commit b18d479

diff --git a/pcmp.py b/pcmp.py
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+++ b/pcmp.py
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+
+"""
+This module implements a parent-child message passing.
+
+It has only one class that implements a bidirectional channel, which allows
+you to send and receive python objects (as long as they're pickable) between a
+parent and its child.
+
+You should instance it before you fork, and then call .child() or .parent()
+according to your status. Then you can begin sending and receiving objects
+with .send() and .recv().
+
+It should work under any Unix, Windows and Mac systems.
+"""
+
+import os
+import pickle
+
+class Channel (object):
+	"Parent-child message passing."
+
+	def __init__(self):
+		self._p2c = os.pipe()
+		self._c2p = os.pipe()
+		self._rfd = None
+		self._wfd = None
+
+	def child(self):
+		"Tell the object we're the child."
+		self._wfd = os.fdopen(self._c2p[1], 'w')  # we write via p1.w
+		self._rfd = os.fdopen(self._p2c[0], 'r')  # and read via p2.r
+
+	def parent(self):
+		"Tell the object we're the parent."
+		self._wfd = os.fdopen(self._p2c[1], 'w')  # we write via p2.w
+		self._rfd = os.fdopen(self._c2p[0], 'r')  # we read via p1.r
+
+	def send(self, o):
+		"Send an object."
+		pickle.dump(o, self._wfd, -1)
+		self._wfd.flush()
+
+	def recv(self):
+		"Receive an object."
+		o = pickle.load(self._rfd)
+		return o
+
diff --git a/samples/pcmp/sample1.py b/samples/pcmp/sample1.py
new file mode 100644
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+++ b/samples/pcmp/sample1.py
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+
+import os
+import pcmp
+
+c = pcmp.Channel()
+
+pid = os.fork()
+if pid == 0:
+	c.child()
+	c.send('Hola papi!')
+	print c.recv()
+else:
+	c.parent()
+	c.send("Hola hijito!")
+	print c.recv()
+	os.wait()
+
+