> I'm seeing some confusing behavior on OS X (10.3.4) relating to 
> pthreads and the execv family of calls.  It appears that when the 
> scheduler thread (from otherlibs/systhreads/thread_posix.ml) is 
> running, any call to execv will fail with "Operation not supported."  
> The same applies to execvp, execve, and execvpe.
>
> If I build the program without linking to threads.cmxa then it works as 
> expected.
> Is this expected behavior?

No.  According to POSIX, exec* has no reason to fail if other threads
are still running in the current process.  These other threads are
terminated.  With system threads, Caml's Unix.exec* functions just
call the corresponding system calls.

If you want to make sure, you could try to reproduce this behavior
with a small C program.

- Xavier Leroy

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