ipython/ipython — pull request #2712 by piti118 (2012-12-21 07:52:14+00:00)
Title: make iostream multiprocessing aware

Fix #2438
Old iostream will segfault on multiprocessing like this since it tries to reuse zmq socket

```python
import multiprocessing as mp
def f(x):
print 'hello',x
pool = [mp.Process(target=f,args=(i,)) for i in range(10)]
for p in pool: p.start()
for p in pool: p.join()
```