Association of connection and read and write events in Nginx event processing, nginxconnection

Association of connection and read and write events in Nginx event processing, nginxconnection

/********************************************************************* * Author  : Samson * Date    : 07/08/2015 * Test platform: *              gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2 *              GNU bash, 4.3.11(1)-release (x86_64-pc-linux-gnu)  * Nginx version: *              Nginx 1.6.2 *              Nginx 1.8.0 * *******************************************************************/

Association between connection and read and write events in Nginx event processing:

In Nginx code, we often see rev = c-> read; ngx_handle_read_event (rev, 0); what is rev?

In ngx_epoll_add_event, What Is ev-> data in ngx_connection_t * c = ev-> data?

In fact, all these traces are found in ngx_event_process_init. In this function, the read_events, write_events, and connections spaces of the cycle global structure are generated and the associations between the three.

Code generated for the three structures:

Cycle-> connections = ngx_alloc (sizeof (ngx_connection_t) * cycle-> connection_n, cycle-> log );

Cycle-> read_events = ngx_alloc (sizeof (ngx_event_t) * cycle-> connection_n, cycle-> log );

Cycle-> write_events = ngx_alloc (sizeof (ngx_event_t) * cycle-> connection_n, cycle-> log );

// Associations of read_events, write_events, and connections. The subscript of the three in cycle is equal to that of a connection event and the fd of the connection, this information will be used directly later.

C = cycle-> connections;

I = cycle-> connection_n;

Next = NULL;

Do {

I --;

C [I]. data = next;

C [I]. read = & cycle-> read_events [I];

C [I]. write = & cycle-> write_events [I];

C [I]. fd = (ngx_socket_t)-1;

Next = & c [I];

# If (NGX_THREADS)

C [I]. lock = 0;

# Endif

} While (I );

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