while ((h = CreateFile(fileName, 
75    80        /* cannot use O_RDONLY, as it == 0 */ 
76    81                          (fileFlags & O_RDWR) ? (GENERIC_WRITE | GENERIC_READ) : 
…    …     
89    94                            NULL)) == INVALID_HANDLE_VALUE) 
90    95        { 
91                 _dosmaperr(GetLastError()); 
     96            /* 
     97             * Sharing violation or locking error can indicate antivirus, backup 
     98             * or similar software that's locking the file. Try again for 30 seconds 
     99             * before giving up. 
     100             */ 
     101            DWORD err = GetLastError(); 
     102            if (err == ERROR_SHARING_VIOLATION ||  
     103                err == ERROR_LOCK_VIOLATION) 
     104            { 
     105                pg_usleep(100000); 
     106                loops++; 
     107     
     108    #ifndef FRONTEND 
     109                if (loops == 50) 
     110                    ereport(LOG, 
     111                        (errmsg("could not open file \"%s\": %s", fileName,  
     112                          (err == ERROR_SHARING_VIOLATION)?_("sharing violation"):_("lock violation")), 
     113                         errdetail("Continuing to retry for 30 seconds."), 
     114                         errhint("You may have antivirus, backup or similar software interfering with the database."))); 
     115    #endif 
     116     
     117                if (loops < 300) 
     118                    continue; 
     119            } 
     120     
     121            _dosmaperr(err); 
92    122            return -1; 
93    123        }