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ensure mutex is unlocked before locking

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This commit is contained in:
Corwin Kuiper 2021-06-24 01:02:41 +01:00
parent a9aad11dd7
commit 1318e7eca4
1 changed files with 6 additions and 1 deletions
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7
agb/src/interrupt.rs
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@ -261,7 +261,7 @@ fn test_vblank_interrupt_handler(gba: &mut crate::Gba) {
);
}
#[derive(Clone, Copy)]
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
enum MutexState {
Locked,
Unlocked(bool),
@ -279,6 +279,11 @@ impl<T> Mutex<T> {
pub fn lock(&self) -> MutexRef<T> {
let state = INTERRUPTS_ENABLED.get();
INTERRUPTS_ENABLED.set(0);
assert_eq!(
unsafe { *self.state.get() },
MutexState::Locked,
"mutex must be unlocked to be able to lock it"
);
unsafe { *self.state.get() = MutexState::Unlocked(state != 0) };
MutexRef {
internal: &self.internal,