Align inner types too

neco.c

@@ -7077,6 +7077,7 @@ int neco_serve(const char *network, const char *address) {
 ////////////////////////////////////////////////////////////////////////////////
 
 struct neco_mutex {
+    _Alignas(16)         // needed for opaque type alias
     int64_t rtid;        // runtime id
     bool locked;         // mutex is locked (read or write)
     int  rlocked;        // read lock counter
@@ -7336,9 +7337,10 @@ int neco_mutex_destroy(neco_mutex *mutex) {
 }
 
 struct neco_waitgroup {
-    int64_t rtid;
-    int count;
-    struct colist queue;
+    _Alignas(16)          // needed for opaque type alias
+    int64_t rtid;         // runtime id
+    int count;            // current wait count
+    struct colist queue;  // coroutine doubly linked list
 };
 
 static_assert(sizeof(neco_waitgroup) >= sizeof(struct neco_waitgroup), "");
@@ -7485,8 +7487,9 @@ int neco_waitgroup_destroy(neco_waitgroup *waitgroup) {
 }
 
 struct neco_cond {
-    int64_t rtid;             // runtime id
-    struct colist queue;      // coroutine doubly linked list
+    _Alignas(16)         // needed for opaque type alias
+    int64_t rtid;        // runtime id
+    struct colist queue; // coroutine doubly linked list
 };
 
 static_assert(sizeof(neco_cond) >= sizeof(struct neco_cond), "");