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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
lib/thrdqueue.h
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@ -103,6 +103,12 @@ void Curl_thrdq_clear(struct curl_thrdq *tqueue,
CURLcode Curl_thrdq_await_done(struct curl_thrdq *tqueue,
uint32_t timeout_ms);
CURLcode Curl_thrdq_set_props(struct curl_thrdq *tqueue,
uint32_t max_len, /* 0 for unlimited */
uint32_t min_threads,
uint32_t max_threads,
uint32_t idle_time_ms);
#ifdef CURLVERBOSE
void Curl_thrdq_trace(struct curl_thrdq *tqueue,
struct Curl_easy *data,