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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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4
lib/multihandle.h
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@ -109,6 +109,9 @@ struct Curl_multi {
struct Curl_dnscache dnscache; /* DNS cache */
struct Curl_ssl_scache *ssl_scache; /* TLS session pool */
#ifdef USE_RESOLV_THREADED
struct curl_thrdq *resolv_thrdq;
#endif
#ifdef USE_LIBPSL
/* PSL cache. */
@ -186,6 +189,7 @@ struct Curl_multi {
BIT(xfer_buf_borrowed); /* xfer_buf is currently being borrowed */
BIT(xfer_ulbuf_borrowed); /* xfer_ulbuf is currently being borrowed */
BIT(xfer_sockbuf_borrowed); /* xfer_sockbuf is currently being borrowed */
BIT(quick_exit); /* do not join threads on cleanup */
#ifdef DEBUGBUILD
BIT(warned); /* true after user warned of DEBUGBUILD */
#endif