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CDateTime uses a lot of Windows handles [message #33381]

Thu, 26 April 2007 19:07

Eclipse User

Originally posted by: nicolas.bihan.free.fr

Hi,

I appreciate the CDateTime widget and decided to use in my RCP application.

But I noticed that a single CDateTime with the CDT.Dropdown style use
about 400 handles in my Windows XP Pro 32 bits.
So, if I add 10 CDateTime in an Editor they use about 4000 handles !

A Windows application is limited to 10 000 handles.
If I open more than 2 editors my app freeze.

I tried with the snippets and the same...

Did you ever notice that before ?

Nicolas Bihan

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Re: CDateTime uses a lot of Windows handles [message #33563 is a reply to message #33381]

Fri, 27 April 2007 12:31

Jeremy Dowdall

Messages: 181
Registered: July 2009

Senior Member

interesting... :)

has anyone seen this sort of issue on GTK or Carbon? (is this an issue
on those platforms?)

Nicolas Bihan wrote:
> Hi,
>
> I appreciate the CDateTime widget and decided to use in my RCP application.
>
> But I noticed that a single CDateTime with the CDT.Dropdown style use
> about 400 handles in my Windows XP Pro 32 bits.
> So, if I add 10 CDateTime in an Editor they use about 4000 handles !
>
> A Windows application is limited to 10 000 handles.
> If I open more than 2 editors my app freeze.
>
> I tried with the snippets and the same...
>
> Did you ever notice that before ?
>
> Nicolas Bihan

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Re: CDateTime uses a lot of Windows handles [message #33597 is a reply to message #33563]

Fri, 27 April 2007 12:32

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

Hi,

What do you mean:
a) That the widget uses that much handles
b) The limitation of handles / process

Tom

Jeremy Dowdall schrieb:
> interesting... :)
>
> has anyone seen this sort of issue on GTK or Carbon? (is this an issue
> on those platforms?)
>
>
> Nicolas Bihan wrote:
>> Hi,
>>
>> I appreciate the CDateTime widget and decided to use in my RCP
>> application.
>>
>> But I noticed that a single CDateTime with the CDT.Dropdown style use
>> about 400 handles in my Windows XP Pro 32 bits.
>> So, if I add 10 CDateTime in an Editor they use about 4000 handles !
>>
>> A Windows application is limited to 10 000 handles.
>> If I open more than 2 editors my app freeze.
>>
>> I tried with the snippets and the same...
>>
>> Did you ever notice that before ?
>>
>> Nicolas Bihan

Report message to a moderator

Re: CDateTime uses a lot of Windows handles [message #33630 is a reply to message #33597]

Fri, 27 April 2007 13:45

Jeremy Dowdall

Messages: 181
Registered: July 2009

Senior Member

b - the limitations

Tom Schindl wrote:
> Hi,
>
> What do you mean:
> a) That the widget uses that much handles
> b) The limitation of handles / process
>
> Tom
>
> Jeremy Dowdall schrieb:
>> interesting... :)
>>
>> has anyone seen this sort of issue on GTK or Carbon? (is this an issue
>> on those platforms?)
>>
>>
>> Nicolas Bihan wrote:
>>> Hi,
>>>
>>> I appreciate the CDateTime widget and decided to use in my RCP
>>> application.
>>>
>>> But I noticed that a single CDateTime with the CDT.Dropdown style use
>>> about 400 handles in my Windows XP Pro 32 bits.
>>> So, if I add 10 CDateTime in an Editor they use about 4000 handles !
>>>
>>> A Windows application is limited to 10 000 handles.
>>> If I open more than 2 editors my app freeze.
>>>
>>> I tried with the snippets and the same...
>>>
>>> Did you ever notice that before ?
>>>
>>> Nicolas Bihan

Report message to a moderator

Re: CDateTime uses a lot of Windows handles [message #33663 is a reply to message #33630]

Fri, 27 April 2007 15:04

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

You mean it is normal that a widget uses 400 Handles? Are you leaking or
allocating so many handles? I have never looked at the code but I'd
say using so many handles is always a problem.

Tom

Jeremy Dowdall schrieb:
> b - the limitations
>
> Tom Schindl wrote:
>> Hi,
>>
>> What do you mean:
>> a) That the widget uses that much handles
>> b) The limitation of handles / process
>>
>> Tom
>>
>> Jeremy Dowdall schrieb:
>>> interesting... :)
>>>
>>> has anyone seen this sort of issue on GTK or Carbon? (is this an
>>> issue on those platforms?)
>>>
>>>
>>> Nicolas Bihan wrote:
>>>> Hi,
>>>>
>>>> I appreciate the CDateTime widget and decided to use in my RCP
>>>> application.
>>>>
>>>> But I noticed that a single CDateTime with the CDT.Dropdown style
>>>> use about 400 handles in my Windows XP Pro 32 bits.
>>>> So, if I add 10 CDateTime in an Editor they use about 4000 handles !
>>>>
>>>> A Windows application is limited to 10 000 handles.
>>>> If I open more than 2 editors my app freeze.
>>>>
>>>> I tried with the snippets and the same...
>>>>
>>>> Did you ever notice that before ?
>>>>
>>>> Nicolas Bihan

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Re: CDateTime uses a lot of Windows handles [message #33731 is a reply to message #33381]

Fri, 27 April 2007 16:43

Eclipse User

Originally posted by: pawwal.invalid.xx

This is a multi-part message in MIME format.
--------------050100070801060200030500
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit

Nicolas Bihan napisał(a):
> Hi,
>
> I appreciate the CDateTime widget and decided to use in my RCP application.
>
> But I noticed that a single CDateTime with the CDT.Dropdown style use
> about 400 handles in my Windows XP Pro 32 bits.
> So, if I add 10 CDateTime in an Editor they use about 4000 handles !
>
> A Windows application is limited to 10 000 handles.
> If I open more than 2 editors my app freeze.
>
> I tried with the snippets and the same...
>
> Did you ever notice that before ?

I think I encountered similar issue. My rcp app seems to run correctly
on most of the machines. Unfortunately on some it doesn't - it throws
the "no more handles" SWTError.

I attached the log file with the stack trace - maybe it will be helpful.
For me it looks like the widget falls - in some conditions - into the
"endless" recursion witch finally ends with the error.

- pw

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Content-Disposition: inline;
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Re: CDateTime uses a lot of Windows handles [message #33765 is a reply to message #33563]

Sat, 28 April 2007 09:51

Eric Suen

Messages: 94
Registered: July 2009

Member

> interesting... :)
>
> has anyone seen this sort of issue on GTK or Carbon? (is this an issue on
> those platforms?)
>

Hmm, I think you should using lightweight design, for examples:

http://www.spket.com/widget.html

These control only use 1-3 handler, just take a look at:

http://www.codeproject.com/

most complicated control are lightweight control, that's the same reason
all the web browser a lightweight control...

http://blogs.msdn.com/oldnewthing/archive/2005/02/11/371042. aspx

Eric

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