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the perform "state machine" is more explained now

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This commit is contained in:
Daniel Stenberg 2001-11-28 15:46:25 +00:00
parent e2844f5e04
commit b93a60daf9
1 changed files with 37 additions and 4 deletions
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39
lib/multi.c
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@ -43,6 +43,7 @@ struct Curl_one_easy {
CURL *easy_handle; /* this is the easy handle for this unit */ CURL *easy_handle; /* this is the easy handle for this unit */
CURLMstate state; /* the handle's state */ CURLMstate state; /* the handle's state */
CURLcode result; /* previous result */
}; };
@ -193,7 +194,7 @@ CURLMcode curl_multi_fdset(CURLM *multi_handle,
/* after the transfer is done, go DONE */ /* after the transfer is done, go DONE */
break; break;
} }
easy = easy->next; /* check next handle */
} }
return CURLM_OK; return CURLM_OK;
@ -209,30 +210,62 @@ CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles)
easy=multi->first.next; easy=multi->first.next;
while(easy) { while(easy) {
switch(easy->state) { switch(easy->state) {
case CURLM_STATE_INIT: case CURLM_STATE_INIT:
/* init this transfer */
easy->result = Curl_init(easy->easy_handle);
/* after init, go CONNECT */ /* after init, go CONNECT */
if(CURLE_OK == easy->result)
easy->state = CURLM_STATE_CONNECT;
break; break;
case CURLM_STATE_CONNECT: case CURLM_STATE_CONNECT:
/* connect */
easy->result = Curl_connect(easy->easy_handle);
/* after connect, go DO */ /* after connect, go DO */
if(CURLE_OK == easy->result)
easy->state = CURLM_STATE_DO;
break; break;
case CURLM_STATE_DO: case CURLM_STATE_DO:
/* Do the fetch or put request */
easy->result = Curl_do(easy->easy_handle);
/* after do, go PERFORM */ /* after do, go PERFORM */
if(CURLE_OK == easy->result)
easy->state = CURLM_STATE_PERFORM;
break; break;
case CURLM_STATE_PERFORM: case CURLM_STATE_PERFORM:
/* read/write data if it is ready to do so */ /* read/write data if it is ready to do so */
easy->result = Curl_readwrite(easy->easy_handle, &done);
/* after the transfer is done, go DONE */ /* after the transfer is done, go DONE */
if(TRUE == done)
easy->state = CURLM_STATE_DONE;
break; break;
case CURLM_STATE_DONE: case CURLM_STATE_DONE:
/* post-transfer command */
easy->result = Curl_done(easy->easy_handle);
/* after we have DONE what we're supposed to do, go COMPLETED */ /* after we have DONE what we're supposed to do, go COMPLETED */
if(CURLE_OK == easy->result)
easy->state = CURLM_STATE_COMPLETED;
break; break;
case CURLM_STATE_COMPLETED: case CURLM_STATE_COMPLETED:
/* this is a completed transfer */ /* this is a completed transfer, it is likely to still be connected */
/* This node should be delinked from the list now and we should post
an information message that we are complete. */
break; break;
} }
if((CURLM_STATE_COMPLETED != easy->state) &&
(CURLE_OK != easy->result)) {
/*
* If an error was returned, and we aren't in completed now,
* then we go to completed and consider this transfer aborted.
*/
easy->state = CURLM_STATE_COMPLETED;
} }
easy = easy->next; /* operate on next handle */
}
return CURLM_OK;
} }
CURLMcode curl_multi_cleanup(CURLM *multi_handle); CURLMcode curl_multi_cleanup(CURLM *multi_handle);