[coLinux-devel] Re: Re: bjh i/o improvement, causes heavy CPU usage on Win2k

[Henry N. <Henry.Ne@Arcor.de>]

George P Boutwell wrote:

> Good detective work Henry.  I'll test this patch out on the Win2k
> machines at home and if they check out I'll commit it to the
> repository.
> 
> On 5/11/05, Henry Nestler <Hen...@ar...> wrote:
> 
>>Promblem founded. It's a feature of XP, not a bug of NT :-(

Sumary:

1. For W2K need this.
-       if ((iodata->transferred += transferred) != iodata->transfer) {
+       if ((iodata->transferred += transferred) > iodata->transfer) {

2. For XP need this, for same access mode as in W2K. This have no effect 
for W2K. W2K is still in this mode by default.
+        long lpMode = PIPE_READMODE_MESSAGE;
+        if (!SetNamedPipeHandleState(handle, &lpMode, 0, 0))

3. After I understand the state machine design from Jonathan =?-) now, 
can remove one time delay. I think. But currently I'm testing it.
Sources of Point 1 + 2 are save and working good.

-- 
Henry Nestler