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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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lib/url.c
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@ -3039,7 +3039,8 @@ static CURLcode resolve_server(struct Curl_easy *data,
}
result = Curl_resolv(data, ehost->name, eport,
conn->ip_version, timeout_ms, pdns);
conn->ip_version, conn->transport_wanted,
timeout_ms, pdns);
DEBUGASSERT(!result || !*pdns);
if(!result) { /* resolved right away, either sync or from dnscache */
DEBUGASSERT(*pdns);