File Locking 1

[Houcmak]

Hi,

I must create a program for school in which I need to support multi-users. So we have to use file locking, but I don't fully understand it (and can't find tutorial on this subject on the net, COBOL is too old damn it ! :/).

So i'm using manual locking on the file, could you tell me more about locking like: when do i need to lock the record, when to unlock it, etc. ?

I'm really desesparate

Huge thanks.

Houcmak

 

[PHV]

Take a look here:

http://flashpages.prodigy.net/bettys1/qoc/

Hope This Help, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244

 

[k5tm]

Can you indicate, please, what compiler you might be using? File and record locking is ab extension which almost every COBOL compiler vendor has, but they do it a bit differently.

Tom Morrison

http://www.liant.com

 

[Houcmak]

The compiler is Visual Object COBOL (Visoc).

Thanks for helping guys (but i'm still blocked unfortunnaly ( )

 

[Houcmak]

Hmmm I think I've understood now, my program is progressing quickly. But I have another question for you:

If I load my program 2 times to test in multi-users context, the second instance say that one of the file is locked (by the other instance if course).

So i'm wondering, anyway to set a file's mode to shareable ?

Thanks

 

[webrabbit]

Compiler and operating system please. Also, could you show us the relevent code.

 

[fredericofonseca]

Some compilers will do the locking automatically, and will not lock the file unless you open it with lock.

Others will lock the file unless you specify " LOCK AUTOMATIC" on the SELECT.

Not sure what your's do, but look at the manuals, and if nothing else try the above.


Regards

Frederico Fonseca
SysSoft Integrated Ltd

http://www.syssoft-int.com