Disallow taking two instances of the same mutex at the same time

[rust-lightning] / lightning / src / sync / nostd_sync.rs

diff --git a/lightning/src/sync/nostd_sync.rs b/lightning/src/sync/nostd_sync.rs
index e17aa6ab15faa5dc33b66dbc1b80ab79fd36cb18..858f60db5b5b46a5bb703f2d454d8d2b2c1f2934 100644 (file)
--- a/lightning/src/sync/nostd_sync.rs
+++ b/lightning/src/sync/nostd_sync.rs
@@ -62,12 +62,15 @@ impl<T> Mutex<T> {
        }
 }
 
-impl<T> LockTestExt for Mutex<T> {
+impl<'a, T: 'a> LockTestExt<'a> for Mutex<T> {
        #[inline]
        fn held_by_thread(&self) -> LockHeldState {
                if self.lock().is_err() { return LockHeldState::HeldByThread; }
                else { return LockHeldState::NotHeldByThread; }
        }
+       type ExclLock = MutexGuard<'a, T>;
+       #[inline]
+       fn unsafe_well_ordered_double_lock_self(&'a self) -> MutexGuard<T> { self.lock().unwrap() }
 }
 
 pub struct RwLock<T: ?Sized> {
@@ -125,12 +128,15 @@ impl<T> RwLock<T> {
        }
 }
 
-impl<T> LockTestExt for RwLock<T> {
+impl<'a, T: 'a> LockTestExt<'a> for RwLock<T> {
        #[inline]
        fn held_by_thread(&self) -> LockHeldState {
                if self.write().is_err() { return LockHeldState::HeldByThread; }
                else { return LockHeldState::NotHeldByThread; }
        }
+       type ExclLock = RwLockWriteGuard<'a, T>;
+       #[inline]
+       fn unsafe_well_ordered_double_lock_self(&'a self) -> RwLockWriteGuard<T> { self.write().unwrap() }
 }
 
 pub type FairRwLock<T> = RwLock<T>;