Redis code structure 2 net, main, event

Redis code structure 2 net, main, event

1. Network Library
Anet. C and networking. C: These two files mainly implement network communication and interaction with the client.
1.1 Anet. c
This file encapsulates basic network socket operations (TCP, unixsock). Here we will briefly describe the functions through the caller. (Some functions are not used yet)
Functions used by server:
Int anettcpserver (char * err, int port, char * bindaddr). This function is called during initserver. It calls anetcreatesocket to create a socket FD (so_reuseaddr is supported, and then anetlisten listens to the port specified by the server.
The second server function is int anettcpaccept (char * err, int S, char * IP, int * port). This function is called by the accepttcphandler function, that is, the current listening socket, after receiving a client connect, call the accepttcphandler function to receive it, create the client socket for communication, and create a redisclient object createclient (FD ), the function calls the other two functions of the file anetnonblock (null, FD); anettcpnodelay (null, FD); set the socket to non-blocking, and disable the Nagle algorithm (that is, merge tabloids into large packets and forward them, but directly send tabloids ).
In addition, int anetpeertostring (int fd, char * IP, int * port) is used to locate the IP address and port corresponding to socket FD.
Functions used by the client:
Int anettcpconnect (char * err, char * ADDR, int port) creates a socket FD and connects it to the specified server. And the socket is blocked.
Int anettcpnonblockconnect (char * err, char * ADDR, int port), which is used by the replication slave and creates a non-blocking Socket FD. |
Summary: Listen uses blocking Io, while server connect uses non-blocking Io. Generally, client connect uses blocking Io, and slave connect uses non-blocking Io. Several of these functions are about unixsocket, which is the same as tcpsocket. They are not used in the current version.
1.2 Networking. C: see

Http://blog.csdn.net/wudongxu/article/details/7005830

2. Main
We classify redis's main framework file, config-related files, and dictionary-related files into this module. Redis main function and servercron process, we have introduced in the previous article, and DB. C and dict. c mainly involves the relationship of several important data structures, see http://hi.csdn.net/attachment/201111/28/0_13224455853iSZ.gif

3. Event Library
This library includes AE. C, AE _epoll.c, AE _kqueue.c, AE _select.c, and syncio. C. Among them, AE. C is responsible for the entire service process AE _epoll.c, AE _kqueue.c, and AE _select.c are three different Io reuse methods. Epoll is used by default. syncio. C is used to block Io synchronization operations. This file is mainly used between master-slave and migrate commands.
Redis uses non-blocking Io when processing user requests, and uses the

The main content of these three databases has been described in the previous articles. There are no more descriptions here.