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|
use std::cmp;
use std::collections::HashMap;
use syn::Ident;
use check::App;
pub type Ownerships = HashMap<Ident, Ownership>;
pub enum Ownership {
/// Owned or co-owned by tasks that run at the same priority
Owned { priority: u8 },
/// Shared by tasks that run at different priorities.
///
/// `ceiling` is the maximum value across all the task priorities
Shared { ceiling: u8 },
}
impl Ownership {
pub fn ceiling(&self) -> u8 {
match *self {
Ownership::Owned { priority } => priority,
Ownership::Shared { ceiling } => ceiling,
}
}
pub fn is_owned(&self) -> bool {
match *self {
Ownership::Owned { .. } => true,
_ => false,
}
}
}
pub fn app(app: &App) -> Ownerships {
let mut ownerships = HashMap::new();
for resource in &app.idle.resources {
ownerships.insert(resource.clone(), Ownership::Owned { priority: 0 });
}
for task in app.tasks.values() {
for resource in &task.resources {
if let Some(ownership) = ownerships.get_mut(resource) {
match *ownership {
Ownership::Owned { priority } => {
if priority == task.priority {
*ownership = Ownership::Owned { priority };
} else {
*ownership = Ownership::Shared {
ceiling: cmp::max(priority, task.priority),
};
}
}
Ownership::Shared { ceiling } => {
if task.priority > ceiling {
*ownership = Ownership::Shared {
ceiling: task.priority,
};
}
}
}
continue;
}
ownerships.insert(
resource.clone(),
Ownership::Owned {
priority: task.priority,
},
);
}
}
ownerships
}
|
