Thanks for the reply. The reason I want to fork is because one thread needs to call system() (or pretend to by fork()ing and exec()ing itself).

I'm expecting that calling system() from a thread would work fine most of the time, since the fork would duplicate all threads, etc, as expected, but would then exec() instantly after the fork. However, if this isn't atomic (eg: if the process received an interrupt just before exec()ing), one of the other threads might continue in the new fork before exec()ing, which certainly isn't what I'd want.

In reply to Re^2: Using forks and threads by ColinHorne
in thread Using forks and threads by ColinHorne

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