On 5/5/07, Antonino Ingargiola <[email protected]> wrote:
On 5/4/07, Paul Fulghum <[email protected]> wrote:
> Antonino:
>
> Can you try two tests (with my patch applied):
>
> 1. comment out the tty_flush_buffer() call in tty_ldisc_flush() and test
>
> 2. uncomment (reenable) the above call and comment out the
> tty_flush_buffer() call in tty_ioctl() and test
I assume you meant tty_buffer_flush(). I've built kernel 1). In kernel
2), do you mean:
/*if (ld->ioctl)
tty_buffer_flush(tty);*/
tty_ldisc_deref(ld);
right? This is what I'm building... I'll report these new tests soon.
Ok test done.
With kernel 1. the behavior is the same as with your plain second
patch only (flush input works but I cannot read anymore from the
serial that was flushed without closing and reopening the port). See
previous mail for the details of the test.
With kernel 2 the behavior is the same as mainline (multiple flushes
are needed to completely empty the buffers). And I _can_ read further
chars from the serial line after the flush. Here it is the ipython
session that document the test with kernel 2:
In [1]: import serial
In [2]: s0 = serial.Serial(0, timeout=1)
In [3]: s1 = serial.Serial(1, timeout=1)
In [4]: s0.write('test\n')
In [5]: s1.inWaiting()
Out[5]: 5L
In [6]: s1.readline()
Out[6]: 'test\n'
In [7]: for i in xrange(1000):
...: s0.write(str(i).zfill(8)+'\n')
...:
In [8]: s1.inWaiting()
Out[8]: 4095L
In [9]: s1.flushInput()
In [10]: s1.inWaiting()
Out[10]: 4095L # NOTE the buffer is still full!
In [11]: s1.flushInput()
In [12]: s1.inWaiting()
Out[12]: 810L # The buffer beginning
to be drained
In [13]: s1.flushInput()
In [14]: s1.inWaiting()
Out[14]: 0L # Now the buffer is empty
In [15]: s0.write('test\n') # An reading further chars works
In [16]: s1.inWaiting()
Out[16]: 5L
In [17]: s1.readline()
Out[17]: 'test\n'
Regards,
~ Antonio
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