source: UsbWattMeter/trunk/curl-7.47.1/lib/multihandle.h@ 167

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1#ifndef HEADER_CURL_MULTIHANDLE_H
2#define HEADER_CURL_MULTIHANDLE_H
3/***************************************************************************
4 * _ _ ____ _
5 * Project ___| | | | _ \| |
6 * / __| | | | |_) | |
7 * | (__| |_| | _ <| |___
8 * \___|\___/|_| \_\_____|
9 *
10 * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
11 *
12 * This software is licensed as described in the file COPYING, which
13 * you should have received as part of this distribution. The terms
14 * are also available at https://curl.haxx.se/docs/copyright.html.
15 *
16 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
17 * copies of the Software, and permit persons to whom the Software is
18 * furnished to do so, under the terms of the COPYING file.
19 *
20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21 * KIND, either express or implied.
22 *
23 ***************************************************************************/
24
25#include "conncache.h"
26
27struct Curl_message {
28 /* the 'CURLMsg' is the part that is visible to the external user */
29 struct CURLMsg extmsg;
30};
31
32/* NOTE: if you add a state here, add the name to the statename[] array as
33 well!
34*/
35typedef enum {
36 CURLM_STATE_INIT, /* 0 - start in this state */
37 CURLM_STATE_CONNECT_PEND, /* 1 - no connections, waiting for one */
38 CURLM_STATE_CONNECT, /* 2 - resolve/connect has been sent off */
39 CURLM_STATE_WAITRESOLVE, /* 3 - awaiting the resolve to finalize */
40 CURLM_STATE_WAITCONNECT, /* 4 - awaiting the TCP connect to finalize */
41 CURLM_STATE_WAITPROXYCONNECT, /* 5 - awaiting proxy CONNECT to finalize */
42 CURLM_STATE_SENDPROTOCONNECT, /* 6 - initiate protocol connect procedure */
43 CURLM_STATE_PROTOCONNECT, /* 7 - completing the protocol-specific connect
44 phase */
45 CURLM_STATE_WAITDO, /* 8 - wait for our turn to send the request */
46 CURLM_STATE_DO, /* 9 - start send off the request (part 1) */
47 CURLM_STATE_DOING, /* 10 - sending off the request (part 1) */
48 CURLM_STATE_DO_MORE, /* 11 - send off the request (part 2) */
49 CURLM_STATE_DO_DONE, /* 12 - done sending off request */
50 CURLM_STATE_WAITPERFORM, /* 13 - wait for our turn to read the response */
51 CURLM_STATE_PERFORM, /* 14 - transfer data */
52 CURLM_STATE_TOOFAST, /* 15 - wait because limit-rate exceeded */
53 CURLM_STATE_DONE, /* 16 - post data transfer operation */
54 CURLM_STATE_COMPLETED, /* 17 - operation complete */
55 CURLM_STATE_MSGSENT, /* 18 - the operation complete message is sent */
56 CURLM_STATE_LAST /* 19 - not a true state, never use this */
57} CURLMstate;
58
59/* we support N sockets per easy handle. Set the corresponding bit to what
60 action we should wait for */
61#define MAX_SOCKSPEREASYHANDLE 5
62#define GETSOCK_READABLE (0x00ff)
63#define GETSOCK_WRITABLE (0xff00)
64
65#define CURLPIPE_ANY (CURLPIPE_HTTP1 | CURLPIPE_MULTIPLEX)
66
67/* This is the struct known as CURLM on the outside */
68struct Curl_multi {
69 /* First a simple identifier to easier detect if a user mix up
70 this multi handle with an easy handle. Set this to CURL_MULTI_HANDLE. */
71 long type;
72
73 /* We have a doubly-linked circular list with easy handles */
74 struct SessionHandle *easyp;
75 struct SessionHandle *easylp; /* last node */
76
77 int num_easy; /* amount of entries in the linked list above. */
78 int num_alive; /* amount of easy handles that are added but have not yet
79 reached COMPLETE state */
80
81 struct curl_llist *msglist; /* a list of messages from completed transfers */
82
83 struct curl_llist *pending; /* SessionHandles that are in the
84 CURLM_STATE_CONNECT_PEND state */
85
86 /* callback function and user data pointer for the *socket() API */
87 curl_socket_callback socket_cb;
88 void *socket_userp;
89
90 /* callback function and user data pointer for server push */
91 curl_push_callback push_cb;
92 void *push_userp;
93
94 /* Hostname cache */
95 struct curl_hash hostcache;
96
97 /* timetree points to the splay-tree of time nodes to figure out expire
98 times of all currently set timers */
99 struct Curl_tree *timetree;
100
101 /* 'sockhash' is the lookup hash for socket descriptor => easy handles (note
102 the pluralis form, there can be more than one easy handle waiting on the
103 same actual socket) */
104 struct curl_hash sockhash;
105
106 /* pipelining wanted bits (CURLPIPE*) */
107 long pipelining;
108
109 bool recheckstate; /* see Curl_multi_connchanged */
110
111 /* Shared connection cache (bundles)*/
112 struct conncache conn_cache;
113
114 /* This handle will be used for closing the cached connections in
115 curl_multi_cleanup() */
116 struct SessionHandle *closure_handle;
117
118 long maxconnects; /* if >0, a fixed limit of the maximum number of entries
119 we're allowed to grow the connection cache to */
120
121 long max_host_connections; /* if >0, a fixed limit of the maximum number
122 of connections per host */
123
124 long max_total_connections; /* if >0, a fixed limit of the maximum number
125 of connections in total */
126
127 long max_pipeline_length; /* if >0, maximum number of requests in a
128 pipeline */
129
130 long content_length_penalty_size; /* a connection with a
131 content-length bigger than
132 this is not considered
133 for pipelining */
134
135 long chunk_length_penalty_size; /* a connection with a chunk length
136 bigger than this is not
137 considered for pipelining */
138
139 struct curl_llist *pipelining_site_bl; /* List of sites that are blacklisted
140 from pipelining */
141
142 struct curl_llist *pipelining_server_bl; /* List of server types that are
143 blacklisted from pipelining */
144
145 /* timer callback and user data pointer for the *socket() API */
146 curl_multi_timer_callback timer_cb;
147 void *timer_userp;
148 struct timeval timer_lastcall; /* the fixed time for the timeout for the
149 previous callback */
150};
151
152#endif /* HEADER_CURL_MULTIHANDLE_H */
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