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global_init: move the IPv6 works status bool to multi handle

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Previously it was stored in a global state which contributed to
curl_global_init's thread unsafety. This boolean is now instead figured
out in curl_multi_init() and stored in the multi handle. Less effective,
but thread safe.

Closes #4851
This commit is contained in:
Daniel Stenberg 2020-01-26 17:51:01 +01:00
parent 872ea75acf
commit 0b030a5b23
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8 changed files with 27 additions and 25 deletions
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lib/multi.c
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@ -370,6 +370,7 @@ struct Curl_multi *Curl_multi_handle(int hashsize, /* socket hash */
/* -1 means it not set by user, use the default value */
multi->maxconnects = -1;
multi->max_concurrent_streams = 100;
multi->ipv6_works = Curl_ipv6works(NULL);
#ifdef ENABLE_WAKEUP
if(Curl_socketpair(AF_UNIX, SOCK_STREAM, 0, multi->wakeup_pair) < 0) {