pub type CpuClockHook = fn() -> f64;Expand description
Function-pointer signature for retrieving program CPU time in seconds.
Backs os.clock. C’s clock() reads CLOCK_PROCESS_CPUTIME_ID, which has no
std equivalent and is unavailable on bare WASM; the stdlib falls back to a
monotonic wall-clock baseline (matching wasi-libc/Emscripten’s emulation) when
this hook is unset. A host wanting true CPU time can install one (e.g. via the
cpu-time crate) without changing the sandboxed crates.