Redis internals
As a network server, Redis's internal operations follow a basic execution flow where the server waits and listens for incoming connections on a port by accepting the connection if the inbound client communicates with the correct syntax and format called the REdis Serialization Protocol (RESP). After accepting the socket connection, Redis yields a descriptor for nonblocking read and write operations on the in-memory state of the database.
Redis Server Execution Flow
For the Redis server, the main function creates an event loop calling the aeMain function that creates an infinite while loop. This loop tests the event loop's stop property and exits if the test fails. Each iteration of the while loop in aeMain calls the aeProcessEvents function with a pointer to the event loop along with any flags. The aeProcessEvents function processes all the time-based events before processing all the file events. Remember that POSIX systems treat running processes as file descriptors...
