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annotate src/event/ngx_event_connect.h @ 6635:6acaa638fa07

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Events: support for EPOLLEXCLUSIVE. This flag appeared in Linux 4.5 and is useful for avoiding thundering herd problem. The current Linux kernel implementation walks the list of exclusive waiters, and queues an event to each epfd, until it finds the first waiter that has threads blocked on it via epoll_wait().
author Valentin Bartenev <vbart@nginx.com>
date Fri, 15 Jul 2016 15:18:57 +0300
parents 1d0e03db9f8e
children e8d4c9e9682a
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #ifndef _NGX_EVENT_CONNECT_H_INCLUDED_
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9 #define _NGX_EVENT_CONNECT_H_INCLUDED_
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12 #include <ngx_config.h>
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13 #include <ngx_core.h>
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14 #include <ngx_event.h>
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16
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17 #define NGX_PEER_KEEPALIVE 1
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18 #define NGX_PEER_NEXT 2
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19 #define NGX_PEER_FAILED 4
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20
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21
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22 typedef struct ngx_peer_connection_s ngx_peer_connection_t;
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23
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24 typedef ngx_int_t (*ngx_event_get_peer_pt)(ngx_peer_connection_t *pc,
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25 void *data);
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26 typedef void (*ngx_event_free_peer_pt)(ngx_peer_connection_t *pc, void *data,
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27 ngx_uint_t state);
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28 #if (NGX_SSL)
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29
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30 typedef ngx_int_t (*ngx_event_set_peer_session_pt)(ngx_peer_connection_t *pc,
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31 void *data);
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32 typedef void (*ngx_event_save_peer_session_pt)(ngx_peer_connection_t *pc,
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33 void *data);
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34 #endif
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36
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37 struct ngx_peer_connection_s {
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38 ngx_connection_t *connection;
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39
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40 struct sockaddr *sockaddr;
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41 socklen_t socklen;
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42 ngx_str_t *name;
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43
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44 ngx_uint_t tries;
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45 ngx_msec_t start_time;
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46
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47 ngx_event_get_peer_pt get;
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48 ngx_event_free_peer_pt free;
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49 void *data;
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50
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51 #if (NGX_SSL)
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52 ngx_event_set_peer_session_pt set_session;
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53 ngx_event_save_peer_session_pt save_session;
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54 #endif
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55
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56 ngx_addr_t *local;
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57
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58 int type;
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59 int rcvbuf;
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60
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61 ngx_log_t *log;
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63 unsigned cached:1;
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64 #if (NGX_HAVE_TRANSPARENT_PROXY)
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65 unsigned transparent:1;
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66 #endif
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67
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68 /* ngx_connection_log_error_e */
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69 unsigned log_error:2;
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70 };
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73 ngx_int_t ngx_event_connect_peer(ngx_peer_connection_t *pc);
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74 ngx_int_t ngx_event_get_peer(ngx_peer_connection_t *pc, void *data);
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77 #endif /* _NGX_EVENT_CONNECT_H_INCLUDED_ */