Hi, Here's an easy question for someone who knows their way around...
I want to maintain a new global counter, but for performance reasons I am reluctant to use a mutex or atomic_increment to update it. I would rather maintain a separate counter for every worker-thread, and only accumulate the global counter when required. (If the per-worker-thread counter is 32-bit then I shouldn't even need a mutex when accumulating the total across all the current threads). Obviously I shouldn't just declare something as "__thread apr_int32_t mycounter;" and mince it together as a linux-only hack. I'd like to find the portable apr-library way to do it. So I think I need to find the following: * - a hook that is called whenever a worker thread is started * - a hook that is called whenever a worker thread is about to die * - a hook to find_or_create a 32-bit integer that is private to the current worker-thread * - a fn to iterate (safely) over all the current worker threads It's the last one that seems particularly elusive. I could't find an ap_ or apr_ library call that seemed to do anything like that. If this has all been done before, please can you point me to the relevant module sources? I think it would save me a lot of time. Alternatively, if you think I should just relax and use an atomic increment instead, then let me know. Thanks! Neil
