Rollup merge of rust-lang#53311 - RalfJung:windows-mutex, r=retep998

Window Mutex: Document that we properly initialize the SRWLock See rust-lang#35836
kennytm · Aug 24, 2018 · ab5a71b · ab5a71b
2 parents 63d6649 + b7a49e7
commit ab5a71b
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/libstd/sys/windows/mutex.rs b/src/libstd/sys/windows/mutex.rs
@@ -58,6 +58,8 @@ pub unsafe fn raw(m: &Mutex) -> c::PSRWLOCK {
 impl Mutex {
     pub const fn new() -> Mutex {
         Mutex {
+            // This works because SRWLOCK_INIT is 0 (wrapped in a struct), so we are also properly
+            // initializing an SRWLOCK here.
             lock: AtomicUsize::new(0),
             held: UnsafeCell::new(false),
         }