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From: Sergey Kashyrin on 25 Mar 2006 18:18
Carl,

I've already figured out that compiling with /MD or /MDd and embedding the
manifest resolves the issue.
There were no problems on XP 32-bit and VS2003.
It happened on XP-64bit and 2003 server with VS2005.
I think you right about TLS entries

Thanks,
Sergey


"Carl Daniel [VC++ MVP]" <cpdaniel_remove_this_and_nospam(a)mvps.org.nospam>
wrote in message news:%23gZYI1EUGHA.4952(a)TK2MSFTNGP09.phx.gbl...
> "Sergey Kashyrin" <ska(a)resqnet.com> wrote in message
> news:OcH99kDUGHA.4384(a)tk2msftngp13.phx.gbl...
>> Here is a short testcase:
>
> I had no problem with your test case loading all 200 DLLs on XP SP2 w/2Gb
> of RAM.
>
> That said, I wonder if you're exhausting the TLS indices. IIRC, every
> copy of the CRT will consume a single TLS entry, and you're loading a new
> copy of the CRT with each DLL.
>
> I changed your sample as follows:
>
> -------------------------
> pch.h
> -------------------------
> #include <windows.h>
> #include <stdio.h>
>
> -------------------------
> pch.c
> -------------------------
> #include "pch..h"
>
> -------------------------
> mod.c
> -------------------------
> #include "pch.h"
>
> BOOL APIENTRY DllMain( HMODULE hModule,
> DWORD ul_reason_for_call,
> LPVOID lpReserved
> )
> {
> fprintf(stderr, "dllmain %s: %d\n", NM, ul_reason_for_call);
> return TRUE;
> }
>
> __declspec(dllexport) void MOD(void);
>
> void MOD(void)
> {
> fprintf(stderr, "Module %s CALL\n", NM);
> }
>
> -------------------------
> main.c
> -------------------------
> #include "pch.h"
>
> int main(int ac, char ** av)
> {
> int i;
> char pgm[16];
> void * x;
> for(i = 100; i < 1000; ++i ) {
> sprintf(pgm, "M%d.dll", i);
> x = LoadLibrary(pgm);
> if(x == NULL) {
> fprintf(stderr, "error load %s %d\n", pgm, GetLastError());
> break;
> }
> }
> return 0;
> }
>
> -------------------------
> build.cmd
> -------------------------
> del *.pch *.dll *.exe
> cl -c -Yc -Fppch.pch pch.c
>
> for /L %%i IN (100,1,1001) do (
> cl -Yupch.h -Fppch.pch /LD /MD /DMOD=M%%i /DNM=\"%%i\" mod.c /link
> /out:M%%i.dll
> mt /manifest M%%i.dll.manifest /outputresource:M%%i.dll;#2
> del *.exp *.lib *.manifest
> )
>
> cl -Yupch.h -Fppch.pch main.c
>
> -------------------------
> Note the use of /MD to use the DLL version of the CRT. Note the use of the
> MT tool to embed the manifest for the CRT in each DLL. With those changes
> I had no problem running your sample with 1000 DLLs I didn't try higher
> than that, but memory usage was only 22Mb at that point, so I suspect I
> could have gone to 10,000 or higher with no problem.
>
> -cd
>
>
>
>


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