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async-thrdd: use thread queue for resolving

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Use a thread queue and pool for asnyc threaded DNS resolves.
Add pytest test_21_* for verification.

Add `CURLMOPT_RESOLVE_THREADS_MAX` to allow applications to
resize the thread pool used.

Add `CURLMOPT_QUICK_EXIT` to allow applications to skip thread
joins when cleaning up a multi handle. Multi handles in
`curl_easy_perform()` inherit this from `CURLOPT_QUICK_EXIT`.

Add several debug environment variables for testing.

Closes #20936
This commit is contained in:
Stefan Eissing 2026-03-24 12:50:53 +01:00 • committed by Daniel Stenberg
parent 507e7be573
commit 39036c9021
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31 changed files with 998 additions and 614 deletions
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6
include/curl/multi.h
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@ -403,6 +403,12 @@ typedef enum {
/* This is the argument passed to the notify callback */
CURLOPT(CURLMOPT_NOTIFYDATA, CURLOPTTYPE_OBJECTPOINT, 19),
/* maximum number of threads used with threaded DNS resolver */
CURLOPT(CURLMOPT_RESOLVE_THREADS_MAX, CURLOPTTYPE_LONG, 20),
/* set to 1L for not joining threads when multi is cleaned up */
CURLOPT(CURLMOPT_QUICK_EXIT, CURLOPTTYPE_LONG, 21),
CURLMOPT_LASTENTRY /* the last unused */
} CURLMoption;