Before curl 8.14.0, when pending was a list, `process_pending_handles()` move a single transfer to processing. In 8.14.0 we changed that to move all pending transfers to processing. This lead to unwanted performance drops as reported in #18017. Restore the old behaviour. While the old behviour is better, the overall handling of "pending" transfers is not optimal, since we do not keep track of the "condition" a pending transfer is waiting on. This means, when moving a single, pending transfer, we might move one that still cannot be processed while another that could is kept pending. Since we trigger `process_pending_handles()` from various changes, the stalled pending will eventually make it to the processing queue, but this is not optimal. Fixes #18017 Reported-by: rm-rmonaghan on github Closes #18056 |
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