[Gambas-user] Why 100% CPU load on file OPEN with WATCH if data comes from a pipe ?

[Benoît Minisini]

Le 19/02/2020 à 00:10, Peter Bauer a écrit :
> Hello,
> Gambas 3.14, When piping like this: (program listing is on the end !)
>  >echo ABC | ./input_reader.gambas     /* pipe just 3 chars
> I see permanent 100% CPU load(with top) on Ubuntu 18.04.01.
> When using from terminal like this, there is no high CPU load:
>  >$./input_reader.gambas
>  >ABC    /* type some text on the terminal
> 
> So for the moment it does not make sense to use the File_Read() event 
> handler with piped input. Could it be a problem with WATCH ? To 
> reproduce please build with "make executable" and then run from the 
> terminal. I do not see the problem when running from the Gambas IDE. Is 
> there a workaround ?
> 
> BR,
> Peter
> 
> Listing ./input_reader.gambas:
> ' Gambas class file
> 
> Static Public hFile1 As Stream
> Static Public sline As String
> 
> Public Sub Form_Open()
> hFile1 = Open "/dev/stdin" For Input Watch
> hFile1.Blocking = False
> End
> 
> Public Sub Form_Close()
>    hFile1.close
> End
> 
> Public Sub File_Read()                          ' File Read event handler
>       While Not Eof(hFile1)
>           Line Input #hFile1, sLine
>           TextArea1.Insert(sLine & gb.NewLine)
>           Wend
> End
> 
> Public Sub Timer1_Timer()       'with 100 ms
>     TextArea1.EnsureVisible()
>       TextArea1.Refresh
> End
> 
> 
> ----[ http://gambaswiki.org/wiki/doc/netiquette ]----
> 

Please send your full project.

Regards,

-- 
Benoît Minisini