.

wcfs/client/wcfs.h

@@ -220,6 +220,12 @@ private:
 // Use .mmap to map file view into memory.
 //
 // It is safe to use FileH from multiple threads simultaneously.
+enum _FileHState {
+    _FileHOpening   = 0,    // FileH open is in progress
+    _FileHOpened    = 1,    // FileH is opened and can be used
+    _FileHClosing   = 2,    // FileH close is in progress
+    _FileHClosed    = 3,    // FileH is closed
+};
 typedef refptr<struct _FileH> FileH;
 struct _FileH : object {
     Conn        wconn;
@@ -240,6 +246,7 @@ struct _FileH : object {
     vector<Mapping>           _mmaps;  // []Mapping ↑blk_start    mappings of this file
 
     // XXX protect by wconn.mu ?
+    enum _FileHState          _state;  // opening/opened/closing/closed
     int                       _nopen;  // number of times Conn.open returned this fileh
     bool                      _closed; // y after .close()