[Boost-users] non incremental use of atomic_counter

Hi, I've got a following problem: I need to maintain actively used shared counter in MT environment. I need usual increment and decrement operations with increment value of 1 plus I also need sometimes to operate with large increment value (like 1000, 10000). I'd like to make handling of this counter as fast as possible and would like to use atomic_counter used inside of boost::shared_ptr, but I can't seem be able to find a way to effectively/correctly implement "massive" increments with it. Any recommendations, Thank you. Gennadiy