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Meaning of "surrogate parent" comment in back-shell/fork.c



I am using the shell backend interface and have had some problems with dead
locking.
There is a comment in the file fork.c that mentions configuring
without-threads or
using a "surrogate" parent. Can someone please explain the meaning of this
term, 
as I am unfamiliar with it? Has anyone implemented a solution using
pthread_atfork()?
Thanks.
		Ron Kunkel