Hi Module maintainers, I'm writing a simple apache module and I'd like to aggregate some statistics. I saw an example module that does this ( https://wiki.apache.org/httpd/ModuleLife) using shared memory.
My question for those on this list following: What is the main difference between using mutexes created via apr_global_mutex_create and apr_proc_mutex_create in terms of performance and safety of the resource that being protected? The docs seem to discourage usage of apr_global_mutex_create: "There is considerable overhead in using this API if only cross-process or cross-thread mutual exclusion is required." Is the overhead purely in code setup (since global mutex should be initialized in post_config), or is this describing some performance penalties as well? Thanks! Ali
