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And in the end it will not make any difference.
One would think access to memory is much slower than any integer op.
Brian
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Hoard claims that it uses a per-processor heap. When I went through the code, it does the following:
It has an array of size 2048, that holds indices of seperate heaps. When a malloc is performed, it identifies the heap to use by the expression
int array_index = (GetCurrentThreadId() / 2) % 2048; (assuming that the thread id never goes above 4096. ) It then looks up the heap to use by
heap_array[array_index]
A number of heaps are initially created. If the heap index returned from the array is 0, it assigns the next free heap to it.
This looks rather like a thread based heap, rather than a processor based heap. How valid is the assumption that threadid will not go above 4096?
Thomas
My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers
modified 29-Aug-18 21:01pm.
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The code doesn't assume the thread id never goes above 4096. The expression is using the modulus operator. array_index will always be in the range 0-2047 regardless of the value returned by GetCurrentThreadId().
But your observation is right; if this is what they're doing, Hoard isn't a per-processor heap manager at all and all the problems they claim are caused by multiple processors are not resolved by their algorithm.
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You are right, I got confused 
But, then it reuses the heap for multiple threads....and there is always a potential that two threads concurrently running on two processors can get the same heap. If the thread ids are sequentially generated, the chances of 2048 being used is quite low. If they are generated randomly, then collisions will be much more frequent; and the performance will not be predictable.
If its is ensured that each thread has its own heap, then two concurrent mallocs will never be operating on the same heap, even though two free operations can be.
My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers
modified 29-Aug-18 21:01pm.
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I have a project that I'm linking to some libraries (sizable but not huge), and my linker has been running for the past 8 minutes @ 99% processor util! 
That's a 1.8GHZ P4 w/ 1.5GB RAM BTW! 
Any ideas?
- Nitron
"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb
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Have a ![Beer | [beer]](https://codeproject.freetls.fastly.net/script/Forums/Images/beer.gif) and chill on it until Monday. 
It is Friday night, after all. 
Seriously though, something must be screwy. Are there any demo projects which came with the libraries that do the same?
Beyond that, I've no idea, other than to check your linker settings, disk space, fragmentation and so on.
Another thought - were the libraries created with the same version of Visual C++ as your project?
Anna ![Rose | [Rose]](https://codeproject.freetls.fastly.net/script/Forums/Images/rose.gif)
Homepage | My life in tears
"Be yourself - not what others think you should be"
- Marcia Graesch
"Anna's just a sexy-looking lesbian tart"
- A friend, trying to wind me up. It didn't work.
Trouble with resource IDs? Try the Resource ID Organiser Visual C++ Add-In
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Anna-Jayne Metcalfe wrote:
Another thought - were the libraries created with the same version of Visual C++ as your project?
hmmm.... 
Anna-Jayne Metcalfe wrote:
Have a and chill on it until Monday.
Good idea! 
- Nitron
"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb
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Slow disk, or compiling over the network...
- Anders
Money talks, but all mine ever says is "Goodbye!"
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Can anyone give me an code-example howto write into an excelfile?
It should not be odbc-like (this already works).
I need something to write direct in an excelcell.
for example I want to write an formula in a cell which refers to the data i've imported "odbc-like" in the excelfile.
Sorry for my terrible English
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Can anyone give me an code-example howto write into an excelfile?
It should not be odbc-like (this already works).
I need something to write direct in an excelcell.
for example I want to write an formula in a cell which refers to the data i've imported "odbc-like" in the excelfile.
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Search MSDN for examples of Excel automation. Here's one I came up with:
_Application app;
Workbooks books;
_Workbook book;
Worksheets sheets;
_Worksheet sheet;
Range range;
COleVariant vtOptional((long) DISP_E_PARAMNOTFOUND, VT_ERROR),
vtTrue((short) TRUE),
vtFalse((short) FALSE);
CString strText;
if (app.CreateDispatch("Excel.Application") == TRUE)
{
app.SetVisible(TRUE);
books = app.GetWorkbooks();
book = books.Add(vtOptional);
sheets = book.GetSheets();
sheet = sheets.GetItem(COleVariant((short) 1));
range = sheet.GetRange(COleVariant("A1"), COleVariant("A1"));
m_ebCellA1.GetWindowText(strText);
range.SetValue(COleVariant(strText));
range = sheet.GetRange(COleVariant("A2"), COleVariant("A2"));
m_ebCellA2.GetWindowText(strText);
range.SetValue(COleVariant(strText));
range = sheet.GetRange(COleVariant("A4"), COleVariant("A4"));
range.SetFormula(COleVariant("=A1 + A2"));
}
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Thx for the fast answer
Which headers do I have to include
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First you'll need to create a new class from the EXCEL9.OLB (or whatever version of Excel you are using) type library. That process will create a .CPP and .H file that gets added to your project.
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And how to start this process? which tool generates this .cpp an .h files.
I'm using vc++ 6.0
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Search MSDN for "excel.automation" and "excel9.olb".
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ok thx,
i will first study a little bit.
I ask again when I knew it a bit better and can ask more special questions.
I thought it would be not as difficult because the odbc-connection was quite easy
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Heiko2003 wrote:
I thought it would be not as difficult because the odbc-connection was quite easy
COM is much easier to do that what was previously required for OLE. With C++ it's even easier when you have smart-pointers and such at your disposal. With VB, it's way too easy! It almost takes the fun out of knowing what is actually going on behind the scene.
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Now I've got a little application that is able to write an value into an excelcell.
Thanks for your information
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Does anyone what are ways (code examples, etc) to make software evaluation based on "time expiration" and/or "number of runs"?
_ra
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Do you have an idea how to do it ? i.e. in plain english (or whatever your mother tongue is ),
(for the expiration )
it's actually quite simple, when the program starts, you compare the current date with either the hard-coded expiration date (expires on june 3rd 2003), or the number of days left (expires in 34 days), if it expired, just warn and quit the program. The first time the program starts, you need to register the current date and keep it somewhere.
The only "hard" thing is to keep the "number of runs" or "expiration" somewhere on the user's computer that is not easy to find; you can hide it in the registry, or in a file somewhere on disk.
But eventually, people will find a way to overcome the limitation.
If you want to release an evalution version, you'd better make it a version with real limitation( no save, run time limit (runs for 30 mins), missing key features, ... )
Max.
Maximilien Lincourt
For success one must aquire one's self
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Have a look at this[^]
Gary Kirkham
A working Program is one that has only unobserved bugs
I thought I wanted a career, turns out I just wanted paychecks
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Hi all,
I have thread A, which calls a function that takes a callback, and spawns thread B. My question is, when the callback is called in Thread B, does it remain in the context of thread B? I'm pretty sure it does, but I wanted to check.
Thanks!
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Yup, as long as thread B is making the call.
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Low priority.
In the top left of an SDI application, on the frame bar is the
little blue MFC icon. I have changed this icon in the resources, but it does not change on the frame bar.
Any suggestions?
thanks
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did you change both the large and small resolutions in the icon resource?
-c
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