import thread, time, os, tempfile

fname = tempfile.mktemp()

f = open(fname, 'w', buffering=1024*1024)

def sneaky_close():
    global f
    while True:
        time.sleep(0.01)
        print 'closing'
        try:
            f.close()
        except IOError:
            pass
        lst = [1] * 1024 * 1024
        for i in lst:
            pass
        print 'closed'
        f = open(fname, 'w', buffering=1024*16)
        
thread.start_new_thread(sneaky_close, ())

big = 'z'*1024*4
while True:
    try:
        print 'write call'
        f.write(big)
        f.flush()
        print 'write returned'
    except ValueError:
        pass