all: split reusable components into workspace crates

src/utils/num_cpus.rs

@@ -1,21 +0,0 @@
-use {
-    crate::utils::oserror::{OsError, OsErrorExt},
-    smallvec::{SmallVec, smallvec_inline},
-    uapi::c,
-};
-
-#[cfg_attr(not(feature = "it"), expect(dead_code))]
-pub fn num_cpus() -> Result<u32, OsError> {
-    let mut buf: SmallVec<[usize; 32]> = smallvec_inline![0; 32];
-    loop {
-        match uapi::sched_getaffinity(0, &mut buf).to_os_error() {
-            Ok(_) => return Ok(count(&buf)),
-            Err(OsError(c::EINVAL)) => buf.extend_from_slice(&[0; 32][..]),
-            Err(e) => return Err(e),
-        }
-    }
-}
-
-fn count(buf: &[usize]) -> u32 {
-    buf.iter().copied().map(|n| n.count_ones()).sum()
-}