How to determine CPU and memory consumption from inside a process?

Question

I once had the task of determining the following performance parameters from inside a running application: - Total virtual memory available - Virtual memory currently used - Virtual memory currently used by my process<hr> - Total RAM available - RAM currently used - RAM currently used by my process<hr> - % CPU currently used - % CPU currently used by my process The code had to run on Windows and Linux. Even though this seems to be a standard task, finding the necessary information in the manuals (WIN32 API, GNU docs) as well as on the Internet took me several days, because there's so much incomplete/incorrect/outdated information on this topic to be found out there. In order to save others from going through the same trouble, I thought it would be a good idea to collect all the scattered information plus what I found by trial and error here in one place.

Answer 1

#include <sys/sysinfo.h>

but the libraries and headers vary depending on OS...

sysconf() calls get ya the heap size