Function GC_get_prof_stats 

pub unsafe extern "C" fn GC_get_prof_stats(
    arg1: *mut GC_prof_stats_s,
    arg2: usize,
) -> usize

Atomically get the collector statistics (various global counters). Clients should pass the size of the buffer (of GC_prof_stats_s type) to fill in the values - this is for interoperability between different collector versions: an old client could have fewer fields, and vice versa, client could use newer gc.h file (with more entries declared in the structure) than that of the linked collector library; in the latter case, unsupported (unknown) fields are filled in with -1 (~0). Return the size (in bytes) of the filled in part of the structure (excluding all unknown fields, if any).