MAT 21B Lecture Notes - Lecture 20: Null Pointer, Memory Leak, Static Variable

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2 Jun 2018

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Lecture 20

Static memory allocation

Life time issue (see below for example correlation)

- Function cannot return a local variable

- When using local variable, all resources have to already exit before calling subfunction

- Global variable exist during the entire programs’ execution even when unused

Code lines examples:

Sizing issue

What if we need more ..

Requirement

- Lifetime independent from function

o Not in the stack

- Lifetime not necessarily for the entire

programs execution

o Not in data segment

Dynamic memory allocation

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