Use monotonic time with condition variables.

Configure condition variables to use monotonic time using
pthread_condattr_setclock on systems where this is possible.
This fixes the issue when thread waiting on condition variable is
woken up too late when system time is moved backwards.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/libstd/sync/condvar.rs b/src/libstd/sync/condvar.rs
index 3c52ebc72f2..ca1a9905ebe 100644
--- a/src/libstd/sync/condvar.rs
+++ b/src/libstd/sync/condvar.rs
@@ -82,10 +82,14 @@ impl Condvar {
     /// notified.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn new() -> Condvar {
-        Condvar {
+        let mut c = Condvar {
             inner: box sys::Condvar::new(),
             mutex: AtomicUsize::new(0),
+        };
+        unsafe {
+            c.inner.init();
         }
+        c
     }
 
     /// Blocks the current thread until this condition variable receives a