RemoveFreeBlock Null pointer

[Taha Liaqat]

SFU ID: tliaqat

Github username: tliaqat

Github: https://github.com/CMPT-295-SFU/assignment-5-tliaqat.git

Question: what is the expected behavior when we call removeFreeBlock on a block that is the only element in the freeList? There are not any null checks on  prevFree in removeFreeBlock. So I am getting a seg fault because my block is the only element, and its next and prev pointers are null.

[ali sedaghati]

The logic of your removeFreeBlock function seems to be okay. Please use gdb to find out the source of the error.

[Taha Liaqat]

the issue is, is that gdb told me the problem was in removeFreeBlock, Line 211.

[Taha Liaqat]

so where do I go from here?

[ali sedaghati]

Please put the output of examine_heap here.

[ashrir...@gmail.com]

Check if the free block is != Free list head.

prev being null is not your problem. 

1) YOUR FREE_LIST_HEAD is not being set to NULL when you have run out of blocks. 

2) You may be potentially corrupting the free blocks next and prev when manipulating your allocated blocks. Check your size parameters.