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multi: add dirty bitset

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Add a bitset `dirty` to the multi handle. The presence of a transfer int
he "dirty" set means: this transfer has something to do ASAP.

"dirty" is set by multiplexing protocols like HTTP/2 and 3 when
encountering response data for another transfer than the current one.
"dirty" is set by protocols that want to be called.

Implementation:

* just an additional `uint_bset` in the multi handle
* `Curl_multi_mark_dirty()` to add a transfer to the dirty set.
* `multi_runsingle()` clears the dirty bit of the transfer at
   start. Without new dirty marks, this empties the set after
   al dirty transfers have been run.
* `multi_timeout()` immediately gives the current time and
   timeout_ms == 0 when dirty transfers are present.
* multi_event: marks all transfers tracked for a socket as dirty.
  Then marks all expired transfers as dirty. Then it runs
  all dirty transfers.

With this mechanism:

* Most uses of `EXPIRE_RUN_NOW` are replaced by `Curl_multi_mark_dirty()`
* `Curl_multi_mark_dirty()` is cheaper than querying if a transfer is
  already dirty or set for timeout. There is no need to check, just do it.
* `data->state.select_bits` is eliminated. We need no longer to
  simulate a poll event to make a transfer run.

Closes #17662
This commit is contained in:
Stefan Eissing 2025-06-18 12:34:43 +02:00 • committed by Daniel Stenberg
parent 7aa8d1eea1
commit 779937f840
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20 changed files with 162 additions and 285 deletions
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4
lib/multiif.h
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@ -173,4 +173,8 @@ struct Curl_easy *Curl_multi_get_easy(struct Curl_multi *multi,
/* Get the # of transfers current in process/pending. */
unsigned int Curl_multi_xfers_running(struct Curl_multi *multi);
/* Mark a transfer as dirty, e.g. to be rerun at earliest convenience.
* A cheap operation, can be done many times repeatedly. */
void Curl_multi_mark_dirty(struct Curl_easy *data);
#endif /* HEADER_CURL_MULTIIF_H */