.

wcfs/client/wcfs.cpp

@@ -606,8 +606,10 @@ error _Mapping::remmap_blk(int64_t blk) {
     return nil;
 }
 
-// unmap removes mapping memory from address space.
-// virtmem calls this when VMA is unmapped.
+// unmap releases mapping memory from address space.
+//
+// After call to unmap the mapping must no longer be used.
+// virtmem calls unmap when VMA is unmapped.
 error _Mapping::unmap() {
     Mapping mmap = newref(this);    // XXX newref for std::remove
     FileH f = mmap->fileh;

wcfs/client/wcfs.h

@@ -238,7 +238,7 @@ public:
 // The mapped memory is [.mem_start, .mem_stop)
 // Use .unmap to release virtual memory resources used by mapping.
 //
-// XXX It is safe to use Mapping from multiple threads simultaneously.
+// It is safe to use Mapping from multiple threads simultaneously.
 typedef refptr<struct _Mapping> Mapping;
 struct _Mapping : object {
     FileH   fileh;