Add thread safety annotated wrapper for std::mutex

Co-authored-by: Anthony Towns <aj@erisian.com.au>

1 files changed, 8 insertions, 2 deletions

diff --git a/src/threadsafety.h b/src/threadsafety.h
index 81f86eac3a..404ecafebb 100644
--- a/src/threadsafety.h
+++ b/src/threadsafety.h
@@ -56,12 +56,18 @@
 #define ASSERT_EXCLUSIVE_LOCK(...)
 #endif // __GNUC__
 
+// StdMutex provides an annotated version of std::mutex for us,
+// and should only be used when sync.h Mutex/LOCK/etc are not usable.
+class LOCKABLE StdMutex : public std::mutex
+{
+};
+
 // LockGuard provides an annotated version of lock_guard for us
 // should only be used when sync.h Mutex/LOCK/etc aren't usable
-class SCOPED_LOCKABLE LockGuard : public std::lock_guard<std::mutex>
+class SCOPED_LOCKABLE LockGuard : public std::lock_guard<StdMutex>
 {
 public:
-    explicit LockGuard(std::mutex& cs) EXCLUSIVE_LOCK_FUNCTION(cs) : std::lock_guard<std::mutex>(cs) { }
+    explicit LockGuard(StdMutex& cs) EXCLUSIVE_LOCK_FUNCTION(cs) : std::lock_guard<StdMutex>(cs) {}
     ~LockGuard() UNLOCK_FUNCTION() {};
 };