Thread: Creating a global linked list?

Well, there are two steps here, right?

One is to CREATE a global linked list - which means to have one or more global variables to represent your memory allocation(s).

The second step is to INITIIALIZE the variable(s) with something - since you want to call sbrk(), you can't use this function as an initializer. So the solution is to use run-time initialization. The "classic" method to do this is to have a flag to say "initialized", which is set to false to begin with, and when malloc is called, you check the "initialized" flag, and call "sbrk" if you need to. [Sometimes this can be done as part of the general checking to see if sbrk() needs to be called, e.g. if you track "size available", or your linked list represents "free blocks", and it's zero (or smaller than the malloc size), then you need to call sbrk() - it then doesn't really matter if it's the first time or hundredth time that you call malloc() - you need to allocate more memory!].

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Mats