always-multi: always use non-blocking internals

Remove internal separated behavior of the easy vs multi intercace.
curl_easy_perform() is now using the multi interface itself.

Several minor multi interface quirks and bugs have been fixed in the
process.

Much help with debugging this has been provided by: Yang Tse

1 files changed, 134 insertions, 0 deletions

diff --git a/lib/multihandle.h b/lib/multihandle.h
new file mode 100644
index 000000000..941835941
--- /dev/null
+++ b/lib/multihandle.h
@@ -0,0 +1,134 @@
+#ifndef HEADER_CURL_MULTIHANDLE_H
+#define HEADER_CURL_MULTIHANDLE_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+struct Curl_message {
+  /* the 'CURLMsg' is the part that is visible to the external user */
+  struct CURLMsg extmsg;
+};
+
+/* NOTE: if you add a state here, add the name to the statename[] array as
+   well!
+*/
+typedef enum {
+  CURLM_STATE_INIT,        /* 0 - start in this state */
+  CURLM_STATE_CONNECT,     /* 1 - resolve/connect has been sent off */
+  CURLM_STATE_WAITRESOLVE, /* 2 - awaiting the resolve to finalize */
+  CURLM_STATE_WAITCONNECT, /* 3 - awaiting the connect to finalize */
+  CURLM_STATE_WAITPROXYCONNECT, /* 4 - awaiting proxy CONNECT to finalize */
+  CURLM_STATE_PROTOCONNECT, /* 5 - completing the protocol-specific connect
+                               phase */
+  CURLM_STATE_WAITDO,      /* 6 - wait for our turn to send the request */
+  CURLM_STATE_DO,          /* 7 - start send off the request (part 1) */
+  CURLM_STATE_DOING,       /* 8 - sending off the request (part 1) */
+  CURLM_STATE_DO_MORE,     /* 9 - send off the request (part 2) */
+  CURLM_STATE_DO_DONE,     /* 10 - done sending off request */
+  CURLM_STATE_WAITPERFORM, /* 11 - wait for our turn to read the response */
+  CURLM_STATE_PERFORM,     /* 12 - transfer data */
+  CURLM_STATE_TOOFAST,     /* 13 - wait because limit-rate exceeded */
+  CURLM_STATE_DONE,        /* 14 - post data transfer operation */
+  CURLM_STATE_COMPLETED,   /* 15 - operation complete */
+  CURLM_STATE_MSGSENT,     /* 16 - the operation complete message is sent */
+  CURLM_STATE_LAST         /* 17 - not a true state, never use this */
+} CURLMstate;
+
+/* we support N sockets per easy handle. Set the corresponding bit to what
+   action we should wait for */
+#define MAX_SOCKSPEREASYHANDLE 5
+#define GETSOCK_READABLE (0x00ff)
+#define GETSOCK_WRITABLE (0xff00)
+
+struct Curl_one_easy {
+  /* first, two fields for the linked list of these */
+  struct Curl_one_easy *next;
+  struct Curl_one_easy *prev;
+
+  struct SessionHandle *easy_handle; /* the easy handle for this unit */
+  struct connectdata *easy_conn;     /* the "unit's" connection */
+
+  CURLMstate state;  /* the handle's state */
+  CURLcode result;   /* previous result */
+
+  struct Curl_message msg; /* A single posted message. */
+
+  /* Array with the plain socket numbers this handle takes care of, in no
+     particular order. Note that all sockets are added to the sockhash, where
+     the state etc are also kept. This array is mostly used to detect when a
+     socket is to be removed from the hash. See singlesocket(). */
+  curl_socket_t sockets[MAX_SOCKSPEREASYHANDLE];
+  int numsocks;
+};
+
+/* This is the struct known as CURLM on the outside */
+struct Curl_multi {
+  /* First a simple identifier to easier detect if a user mix up
+     this multi handle with an easy handle. Set this to CURL_MULTI_HANDLE. */
+  long type;
+
+  /* We have a doubly-linked circular list with easy handles */
+  struct Curl_one_easy easy;
+
+  int num_easy; /* amount of entries in the linked list above. */
+  int num_alive; /* amount of easy handles that are added but have not yet
+                    reached COMPLETE state */
+
+  struct curl_llist *msglist; /* a list of messages from completed transfers */
+
+  /* callback function and user data pointer for the *socket() API */
+  curl_socket_callback socket_cb;
+  void *socket_userp;
+
+  /* Hostname cache */
+  struct curl_hash *hostcache;
+
+  /* timetree points to the splay-tree of time nodes to figure out expire
+     times of all currently set timers */
+  struct Curl_tree *timetree;
+
+  /* 'sockhash' is the lookup hash for socket descriptor => easy handles (note
+     the pluralis form, there can be more than one easy handle waiting on the
+     same actual socket) */
+  struct curl_hash *sockhash;
+
+  /* Whether pipelining is enabled for this multi handle */
+  bool pipelining_enabled;
+
+  /* Shared connection cache (bundles)*/
+  struct conncache *conn_cache;
+
+  /* This handle will be used for closing the cached connections in
+     curl_multi_cleanup() */
+  struct SessionHandle *closure_handle;
+
+  long maxconnects; /* if >0, a fixed limit of the maximum number of entries
+                       we're allowed to grow the connection cache to */
+
+  /* timer callback and user data pointer for the *socket() API */
+  curl_multi_timer_callback timer_cb;
+  void *timer_userp;
+  struct timeval timer_lastcall; /* the fixed time for the timeout for the
+                                    previous callback */
+};
+
+#endif /* HEADER_CURL_MULTIHANDLE_H */
+