# f.close() is not thread-safe: calling it at the same time as another

# operation (or another close) on the same file, but done from another

# thread, causes crashes.  The issue is more complicated than it seems,

# witness the discussions in:

#

# http://bugs.python.org/issue595601

# http://bugs.python.org/issue815646

import thread

while 1:

    f = open("multithreaded_close.tmp", "w")

    thread.start_new_thread(f.close, ())

    f.close()