Month: August 2015

Process is a program in execution. Process is dynamic and active and it resides in Main memory. Process is a data structure which has attributes as well as process states. Attributes are like process id, state, GPR, program counter, list of open files and devices etc. Process states are: ready, running, block, suspended etc. There are 3 types of schedulers namely: long term (new to ready ), short term(ready to run) and medium term(for swapping)

Compiler is a program which coverts High Level Language (source code) into assembly level language (executable code). Compiler works fast as compared to interpreter. Compiler comprises of following:
1. Lexical Analyzer (Generates Tokens),
2. Syntax analyzer (generates parser),
3. Semantic Analyzer (type checking),
4. Intermediate Code Generation (3-address code),
5.Code Optimization, and 6. Target code generation.