| /// The return value from a yield_no_wait call. |
| // Calling yield-no-wait passes a *mut YieldNoWaitReturn to the kernel, which |
| // the kernel writes to. We cannot safely pass a `*mut bool` to the kernel, |
| // because the representation of `bool` in Rust is undefined (although it is |
| // likely false == 0, true == 1, based on `bool`'s conversions). Using *mut |
| // YieldNoWaitReturn rather than a *mut u8 allows the compiler to assume the |
| // kernel will never write a value other than 0 or 1 into the pointee. Assuming |
| // the likely representation of `bool`, this makes the conversion into `bool` |
| // free. |
| #[derive(Clone, Copy, Debug, Eq, PartialEq)] |
| #[repr(u8)] |
| pub enum YieldNoWaitReturn { |
| NoCallback = 0, |
| Callback = 1, |
| } |
