+// Default fast and race free locks and condition variables
+#if !defined(OLD_LOCKS)
+
+typedef SRWLOCK Lock;
+typedef CONDITION_VARIABLE WaitCondition;
+
+# define lock_init(x) InitializeSRWLock(x)
+# define lock_grab(x) AcquireSRWLockExclusive(x)
+# define lock_release(x) ReleaseSRWLockExclusive(x)
+# define lock_destroy(x) (x)
+# define cond_destroy(x) (x)
+# define cond_init(x) InitializeConditionVariable(x)
+# define cond_signal(x) WakeConditionVariable(x)
+# define cond_wait(x,y) SleepConditionVariableSRW(x, y, INFINITE,0)
+
+// Fallback solution to build for Windows XP and older versions, note that
+// cond_wait() is racy between lock_release() and WaitForSingleObject().
+#else
+