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39036c9021
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
60 lines
1.3 KiB
Markdown
60 lines
1.3 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLMOPT_QUICK_EXIT
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_QUICK_EXIT (3)
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Protocol:
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- All
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Added-in: 8.20.0
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---
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# NAME
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CURLOPT_QUICK_EXIT - allow libcurl to exit quickly
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_QUICK_EXIT,
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long value);
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~~~
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# DESCRIPTION
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Pass a long as a parameter, 1L meaning that when recovering from a timeout,
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libcurl should skip lengthy cleanups that are intended to avoid all kinds of
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leaks (threads etc.), as the caller program is about to call exit() anyway.
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This allows for a swift termination after a DNS timeout for example, by
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canceling and/or forgetting about a resolver thread, at the expense of a
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possible (though short-lived) leak of associated resources.
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# DEFAULT
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20.
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURLM *m = curl_multi_init();
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/* do not join threads when cleaning up this multi handle */
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curl_multi_setopt(m, CURLMOPT_QUICK_EXIT, 1L);
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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curl_multi_setopt(3) returns a CURLMcode indicating success or error.
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CURLM_OK (0) means everything was OK, non-zero means an error occurred, see
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libcurl-errors(3).
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