If your OS has 'pstack' (which at least Linux and Solaris do) then you can get a stack trace from a running process without using gdb.
You won't see too much of use unless you've got symbols loaded, but it's worth a try.
Otherwise, on Linux you can try 'strace -p <pid>' to get a look at what system calls the process is doing, this can be quite illuminating.
The equivalent on Solaris is 'truss', which can also peek into shared libraries (see the -u option).
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