std: add an RAII unlocker to Mutex.

This automatically unlocks its lock when it goes out of scope, and
provides a safe(ish) method to call .wait.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libsync/sync/mutex.rs b/src/libsync/sync/mutex.rs
index 3726528a5e9..f5914b26e85 100644
--- a/src/libsync/sync/mutex.rs
+++ b/src/libsync/sync/mutex.rs
@@ -288,11 +288,11 @@ impl StaticMutex {
     // `lock()` function on an OS mutex
     fn native_lock(&mut self, t: ~Task) {
         Local::put(t);
-        unsafe { self.lock.lock(); }
+        unsafe { self.lock.lock_noguard(); }
     }
 
     fn native_unlock(&mut self) {
-        unsafe { self.lock.unlock(); }
+        unsafe { self.lock.unlock_noguard(); }
     }
 
     fn green_lock(&mut self, t: ~Task) {