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779937f840
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 |
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