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make logical non-const, check input using assertions

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Jorge Aparicio 2017-03-11 18:02:11 -05:00
parent fd858a1994
commit 2d6af9b5df
1 changed files with 4 additions and 8 deletions
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12
src/lib.rs
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@ -249,15 +249,11 @@ unsafe impl<T, Ceiling> Sync for Resource<T, Ceiling> {}
/// priorities encode the actual priority in the highest bits of a byte so
/// priorities like `1` and `2` aren't actually different)
///
/// NOTE `logical` must be in the range `[1, 15]` (inclusive)
pub const fn logical(priority: u8) -> u8 {
// NOTE elements 1 and 2 of the tuple are a poor man's const context range
// checker
(((1 << PRIORITY_BITS) - priority) << (8 - PRIORITY_BITS),
priority - 1,
priority + 240)
.0
/// NOTE Input `priority` must be in the range `[1, 16]` (inclusive)
pub fn logical(priority: u8) -> u8 {
assert!(priority >= 1 && priority <= 16);
((1 << PRIORITY_BITS) - priority) << (8 - PRIORITY_BITS)
}
/// Fake ceiling, indicates that the resource is shared by cooperative tasks