1 files changed, 7 insertions, 2 deletions
diff --git a/src/raw_rwlock.rs b/src/raw_rwlock.rs
index 19b61c8..21d338b 100644
--- a/src/raw_rwlock.rs
+++ b/src/raw_rwlock.rs
@@ -12,12 +12,11 @@ use core::{
     cell::Cell,
     sync::atomic::{AtomicUsize, Ordering},
 };
-use instant::Instant;
 use lock_api::{RawRwLock as RawRwLock_, RawRwLockUpgrade};
 use parking_lot_core::{
     self, deadlock, FilterOp, ParkResult, ParkToken, SpinWait, UnparkResult, UnparkToken,
 };
-use std::time::Duration;
+use std::time::{Duration, Instant};
 
 // This reader-writer lock implementation is based on Boost's upgrade_mutex:
 // https://github.com/boostorg/thread/blob/fc08c1fe2840baeeee143440fba31ef9e9a813c8/include/boost/thread/v2/shared_mutex.hpp#L432
@@ -144,6 +143,12 @@ unsafe impl lock_api::RawRwLock for RawRwLock {
         let state = self.state.load(Ordering::Relaxed);
         state & (WRITER_BIT | READERS_MASK) != 0
     }
+
+    #[inline]
+    fn is_locked_exclusive(&self) -> bool {
+        let state = self.state.load(Ordering::Relaxed);
+        state & (WRITER_BIT) != 0
+    }
 }
 
 unsafe impl lock_api::RawRwLockFair for RawRwLock {