81 lines
1.9 KiB
Markdown
81 lines
1.9 KiB
Markdown
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---
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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: CURLOPT_STREAM_DEPENDS_E
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Section: 3
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Source: libcurl
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See-also:
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- CURLMOPT_PIPELINING (3)
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- CURLOPT_HTTP_VERSION (3)
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- CURLOPT_STREAM_DEPENDS (3)
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- CURLOPT_STREAM_WEIGHT (3)
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---
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# NAME
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CURLOPT_STREAM_DEPENDS_E - stream this transfer depends on exclusively
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_DEPENDS_E,
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CURL *dephandle);
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~~~
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# DESCRIPTION
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Pass a CURL pointer in *dephandle* to identify the stream within the same
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connection that this stream is depending upon exclusively. That means it
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depends on it and sets the Exclusive bit.
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The spec says "Including a dependency expresses a preference to allocate
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resources to the identified stream rather than to the dependent stream."
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Setting a dependency with the exclusive flag for a reprioritized stream causes
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all the dependencies of the new parent stream to become dependent on the
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reprioritized stream.
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This option can be set during transfer.
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*dephandle* must not be the same as *handle*, that makes this function return
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an error. It must be another easy handle, and it also needs to be a handle of
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a transfer that is about to be sent over the same HTTP/2 connection for this
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option to have an actual effect.
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# DEFAULT
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NULL
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# PROTOCOLS
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HTTP/2
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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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CURL *curl = curl_easy_init();
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CURL *curl2 = curl_easy_init(); /* a second handle */
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/one");
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/* the second depends on the first */
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curl_easy_setopt(curl2, CURLOPT_URL, "https://example.com/two");
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curl_easy_setopt(curl2, CURLOPT_STREAM_DEPENDS_E, curl);
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/* then add both to a multi handle and transfer them! */
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}
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}
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~~~
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# AVAILABILITY
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Added in 7.46.0
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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