Even linking with libc6 does not cause multiple threads to work correctly. You
have to link with libpthreads to have threading work correctly (ie, add
-lpthreads).
Though I've not digged to find out the reason, it appears that just linking
libc6 fills in pthread apis without actually doing anythin
What you are doing wrong is compiling an app to debug it w/ optimizations.
This may not be causing your problem (I have never tried to use ddd). However
-g and -O? is not guaranteed to work well. It works, but the results are not
well defined. To debug just use -g, then once it is working turn
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