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Note that Gregory P. Smith has written
 http://code.google.com/p/python-atfork/
I also started a pure python patch but did not get round it posting it. (It also implements the fork lock idea.) I'll attach it here.
How do you intend to handle the propagation of exceptions? I decided that after
 atfork.atfork(prepare1, parent1, child1)
 atfork.atfork(prepare2, parent2, child2)
 ...
 atfork.atfork(prepareN, parentN, childN)
calling "pid = os.fork()" should be equivalent to
 pid = None
 prepareN()
 try:
 ...
 prepare2()
 try:
 prepare1()
 try:
 pid = posix.fork()
 finally:
 parent1() if pid != 0 else child1()
 finally:
 parent2() if pid != 0 else child2()
 ...
 finally:
 parentN() if pid != 0 else childN()