Sharing a Flag Between Users of Same DLL

Ofer Elboher

Hi,

I added the following code in a DLL of mine:

#pragma data_seg(".shared")
BOOL my_flag = false;
#pragma data_seg()
#pragma comment(linker, "/section:.shared,RWS")

But after some user application calls a function that sets it to 'true', it still shows up 'false' to the instance of this DLL in another user application.

Any help would be appreciated.

Thanks,
Ofer.

Viorel.

Can you retry with volatile keyword and see if helps

volatile BOOL my_flag = false;

Ofer Elboher

I already tried, and it does not help.

Any other idea

Thanks,

ofer.

Ofer Elboher

One more thing that might matter: The 2 user applications that load this DLL are an unmanaged C++ app and a managed C# app.

Ofer.

Paul Marriott

Have you got any other variables declared in the data_seg area

I have found that all vars need to be initialised, and if any or then are not then the whole data_seg fails

i.e - Fails

#pragma data_seg(".shared")
BOOL my_flag = false;

BOOL md_data;
#pragma data_seg()

i.e OK

#pragma data_seg(".shared")
BOOL my_flag = false;

BOOL md_data = false
#pragma data_seg()

Ofer Elboher

No, I only have a single boolean there.

Ofer.