multi: make the "general" list of easy handles a Curl_llist #14474
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Instead of having an especially "unique" linked list handler for the main list of easy handles within the multi handle, this now uses a regular Curl_llist for this as well. With this change, it is also clearer that every easy handle added to a multi handle belongs to one and only one out of three different lists: process - the general one for normal transfer processing pending - queued up waiting to get a connection (MSTATE_PENDING) msgsent - transfer completed (MSTATE_MSGSENT) An easy handle must therefore be removed from the current list before it gets added to another. Closes #14474
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Instead of having an especially "unique" linked list handler for the main list of easy handles within the multi handle, this now uses a regular Curl_llist for this as well.
With this change, it is clearer that every easy handle added to a multi handle belongs to one and only one out of three different lists:
process - the general one for normal transfer processing
pending - queued up waiting to get a connection (MSTATE_PENDING)
msgsent - transfer completed (MSTATE_MSGSENT)