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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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3
src/tool_operate.c
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@ -1867,6 +1867,9 @@ static CURLcode parallel_transfers(CURLSH *share)
if(!s->multi)
return CURLE_OUT_OF_MEMORY;
#ifndef DEBUGBUILD
(void)curl_multi_setopt(s->multi, CURLMOPT_QUICK_EXIT, 1L);
#endif
(void)curl_multi_setopt(s->multi, CURLMOPT_NOTIFYFUNCTION, mnotify);
(void)curl_multi_setopt(s->multi, CURLMOPT_NOTIFYDATA, s);
(void)curl_multi_notify_enable(s->multi, CURLMNOTIFY_INFO_READ);