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Code Issues Releases Wiki Activity

ircd::net::dns: Improve cache waiting dup check.

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This commit is contained in:
Jason Volk 2020-04-24 23:50:44 -07:00
parent fc14d4c825
commit 2556a18cdf
1 changed files with 5 additions and 4 deletions
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9
ircd/net_dns.cc
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@ -142,12 +142,13 @@ ircd::net::dns::resolve(const hostport &hp_,
// Remote query will be made; register this callback as waiting for reply
assert(cb);
const ctx::critical_assertion ca;
cache::waiting.emplace_back(hp, opts, std::move(cb));
// Check if there is already someone else waiting on the same query
const auto count
const auto existing
{
std::count_if(begin(cache::waiting), end(cache::waiting), []
std::find_if(begin(cache::waiting), end(cache::waiting), []
(const auto &a)
{
return a == cache::waiting.back();
@ -155,8 +156,8 @@ ircd::net::dns::resolve(const hostport &hp_,
};
// When nobody else is already waiting on this query we have to submit it.
assert(count >= 1);
if(count == 1)
assert(existing != end(cache::waiting));
if(*existing == cache::waiting.back())
resolver_call(hp, opts);
}