1 #ifndef HEADER_CURL_MULTIHANDLE_H
2 #define HEADER_CURL_MULTIHANDLE_H
3 /***************************************************************************
5 * Project ___| | | | _ \| |
7 * | (__| |_| | _ <| |___
8 * \___|\___/|_| \_\_____|
10 * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
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.se/docs/copyright.html.
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.
20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21 * KIND, either express or implied.
23 * SPDX-License-Identifier: curl
25 ***************************************************************************/
29 #include "conncache.h"
31 #include "socketpair.h"
36 struct Curl_llist_element list;
37 /* the 'CURLMsg' is the part that is visible to the external user */
38 struct CURLMsg extmsg;
41 /* NOTE: if you add a state here, add the name to the statename[] array as
45 MSTATE_INIT, /* 0 - start in this state */
46 MSTATE_PENDING, /* 1 - no connections, waiting for one */
47 MSTATE_CONNECT, /* 2 - resolve/connect has been sent off */
48 MSTATE_RESOLVING, /* 3 - awaiting the resolve to finalize */
49 MSTATE_CONNECTING, /* 4 - awaiting the TCP connect to finalize */
50 MSTATE_TUNNELING, /* 5 - awaiting HTTPS proxy SSL initialization to
51 complete and/or proxy CONNECT to finalize */
52 MSTATE_PROTOCONNECT, /* 6 - initiate protocol connect procedure */
53 MSTATE_PROTOCONNECTING, /* 7 - completing the protocol-specific connect
55 MSTATE_DO, /* 8 - start send off the request (part 1) */
56 MSTATE_DOING, /* 9 - sending off the request (part 1) */
57 MSTATE_DOING_MORE, /* 10 - send off the request (part 2) */
58 MSTATE_DID, /* 11 - done sending off request */
59 MSTATE_PERFORMING, /* 12 - transfer data */
60 MSTATE_RATELIMITING, /* 13 - wait because limit-rate exceeded */
61 MSTATE_DONE, /* 14 - post data transfer operation */
62 MSTATE_COMPLETED, /* 15 - operation complete */
63 MSTATE_MSGSENT, /* 16 - the operation complete message is sent */
64 MSTATE_LAST /* 17 - not a true state, never use this */
67 /* we support N sockets per easy handle. Set the corresponding bit to what
68 action we should wait for */
69 #define MAX_SOCKSPEREASYHANDLE 5
70 #define GETSOCK_READABLE (0x00ff)
71 #define GETSOCK_WRITABLE (0xff00)
73 #define CURLPIPE_ANY (CURLPIPE_MULTIPLEX)
75 #if !defined(CURL_DISABLE_SOCKETPAIR)
79 /* value for MAXIMUM CONCURRENT STREAMS upper limit */
80 #define INITIAL_MAX_CONCURRENT_STREAMS ((1U << 31) - 1)
82 /* This is the struct known as CURLM on the outside */
84 /* First a simple identifier to easier detect if a user mix up
85 this multi handle with an easy handle. Set this to CURL_MULTI_HANDLE. */
88 /* We have a doubly-linked list with easy handles */
89 struct Curl_easy *easyp;
90 struct Curl_easy *easylp; /* last node */
92 int num_easy; /* amount of entries in the linked list above. */
93 int num_alive; /* amount of easy handles that are added but have not yet
94 reached COMPLETE state */
96 struct Curl_llist msglist; /* a list of messages from completed transfers */
98 struct Curl_llist pending; /* Curl_easys that are in the
99 MSTATE_PENDING state */
101 /* callback function and user data pointer for the *socket() API */
102 curl_socket_callback socket_cb;
105 /* callback function and user data pointer for server push */
106 curl_push_callback push_cb;
110 struct Curl_hash hostcache;
117 /* timetree points to the splay-tree of time nodes to figure out expire
118 times of all currently set timers */
119 struct Curl_tree *timetree;
121 /* 'sockhash' is the lookup hash for socket descriptor => easy handles (note
122 the pluralis form, there can be more than one easy handle waiting on the
123 same actual socket) */
124 struct Curl_hash sockhash;
126 /* Shared connection cache (bundles)*/
127 struct conncache conn_cache;
129 long maxconnects; /* if >0, a fixed limit of the maximum number of entries
130 we're allowed to grow the connection cache to */
132 long max_host_connections; /* if >0, a fixed limit of the maximum number
133 of connections per host */
135 long max_total_connections; /* if >0, a fixed limit of the maximum number
136 of connections in total */
138 /* timer callback and user data pointer for the *socket() API */
139 curl_multi_timer_callback timer_cb;
141 struct curltime timer_lastcall; /* the fixed time for the timeout for the
143 unsigned int max_concurrent_streams;
146 WSAEVENT wsa_event; /* winsock event used for waits */
149 curl_socket_t wakeup_pair[2]; /* socketpair() used for wakeup
150 0 is used for read, 1 is used for write */
153 #define IPV6_UNKNOWN 0
156 unsigned char ipv6_up; /* IPV6_* defined */
157 bool multiplexing; /* multiplexing wanted */
158 bool recheckstate; /* see Curl_multi_connchanged */
159 bool in_callback; /* true while executing a callback */
163 bool dead; /* a callback returned error, everything needs to crash and
167 #endif /* HEADER_CURL_MULTIHANDLE_H */