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modules/m_vm_fetch: Allow prev_fetch to check if events arrived elsehow while waiting.

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This commit is contained in:
Jason Volk 2020-04-16 18:53:29 -07:00
parent 7b0f17368d
commit 6124bf612c
1 changed files with 16 additions and 3 deletions
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19
modules/m_vm_fetch.cc
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@ -605,12 +605,25 @@ ircd::m::vm::fetch::prev(const event &event,
ctx::when_all(begin(futures), end(futures))
};
// yields context
const bool done
const auto timeout
{
fetching.wait(seconds(event_timeout), std::nothrow)
now<system_point>() + seconds(event_timeout)
};
// Rather than waiting for all of the events to arrive or for the entire
// timeout to expire, we check if the sought events made it to the server
// in the meantime. If so we can drop these requests and bail.
while(now<system_point>() < timeout)
{
// Wait for an interval to give this loop some iterations.
if(fetching.wait(milliseconds(500), std::nothrow))
break;
// Check for satisfaction.
if((prev_exists = prev.prev_events_exist()) == prev_count)
return;
}
// evaluate results
for(auto &future : futures) try
{