[HACKERS] New to PostGre SQL asking about write-ahead-log (WAL)

Hi, I am new to PostGre SQL and want to ask some questions. In my database class, we plan to work on a class project based on WAL. Since we are not familiar with WAL, we don't know what's a good start point. Could anyone point me to any documentation mentioning about WAL in PostGre SQL? It will be

[HACKERS] “Core” function in Postgres

Hi experts, I want to know what's the "core" function used in Postgres server? I am looking for something corresponding to main() in a simple C program. I want to know the file path and the function name. I am using Postgres 9.3.5, however I assume the "core" function will be unchanged between dif