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use crate::{Lock, LockToken};
pub fn lock2<'token, A, B>(_: &'token mut LockToken, a: A, b: B) -> (A::Output, B::Output)
where
A: Lock<'token> + 'token,
B: Lock<'token> + 'token,
{
unsafe {
let lock_a = a.lock_info();
let lock_b = b.lock_info();
let mut locks = [&lock_a, &lock_b];
if locks[0].id > locks[1].id {
let tmp = locks[0];
locks[0] = locks[1];
locks[1] = tmp;
}
locks[0].guard.lock();
locks[1].guard.lock();
(a.lock_unchecked(), b.lock_unchecked())
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::*;
#[test]
fn test_lock2() {
let mut group = LockGroup::new();
let mut token = group.token();
let mutex_a = group.mutex(42);
let mutex_b = group.mutex(35);
let (a, mut b) = lock2(&mut token, mutex_a.read(), mutex_b.write());
assert_eq!(*a, 42);
assert_eq!(*b, 35);
*b = 15;
}
#[test]
fn test_lock2_rev() {
let mut group = LockGroup::new();
let mut token = group.token();
let mutex_b = group.mutex(35);
let mutex_a = group.mutex(42);
let (a, mut b) = lock2(&mut token, mutex_a.read(), mutex_b.write());
assert_eq!(*a, 42);
assert_eq!(*b, 35);
*b = 15;
}
}