[moved&merged] How to handle low memory condition

[sym1]

Hi ,

How did you handle low memory situation?

For instance my phone is freezing while starting my symbian app when the memory is low.

Basically where should you check for low memory and how how do a get en error message instead of some unexpected behaviour like phone freezing ?

I have a server application which does not have any UI, it runs in background.

any sample code ?

Thank you!

[sym1]

Hi ,

How to handle low memory situation in Symbian?

For instance my phone is freezing while starting my symbian app when the memory is low. lets say when I have 0 RAM.
I am using N97 for development.

Basically where should you check for low memory and how how do a get en error message instead of some unexpected behaviour like phone freezing ?

I have a server application which does not have any UI, it runs in background.

do I have to check it before starting the server ? any sample code ?

Thanks!

[wizard_hu_]

It matters a lot when it occurs:
- if the device is unresponsive prior to giving control to your E32Main, there are no obvious things you could do
- however if it is your own code which starts allocating large amounts of memory, an obvious thing could be having a good estimation of your initial memory requirements, and specifying that one as initial heap size (with EPOCHEAPSIZE keyword in the .mmp - Carbide.c++ also supports this setting in its .mmp editor).

[sym1]

Hi Thanks for your response!

My requirement is like, if there is not enough memory(RAM) in the phone while I start my application, instead of freezing or crashing, my app/system should display an error message like "Low memory!" or "not enough memory!".

There are possibilitiles that the phone memory is already full by other applications, and I try starting my application.

Currently, to create this scenarion i am using a memory eater tool to eat memory and my phone is freezing while I set the free RAM memory to bellow 300KB or lets say 0KB.

I have noticed that some applications showing error messages like "not enough memory" while starting, if there are not enough memory in the phone. I just need a simple case like that.

Thanks!

[ltomuta]

Simple!? Well, what can be more simple that this:
- estimate how much memory your app needs
- when app starts, try to allocate a equally big memory bloc
- if allocation succeeds, delete the allocated memory and continue with your application
- if the allocation fails, [show a note and] exit

[sym1]

Appriciate your response!

This is the same way of allocation I had thought but I was confused with mmp file heap memory allocation.

Then what is the difference between manually allocating memory for my app before the application starts compared to the one specified in mmp file ?

BTW, do you mean allocating just before starting or creating the application process ?

Thanks