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When the registerred unblock function is called, it should retry
the cancelled blocking function if possible after checkints.
For example, `SIGCHLD` can cancel this method, but it should not
raise any exception if there is no trap handlers.
The following is repro-code:
```ruby
require 'socket'
PN = 10_000
1000000.times{
p _1
PN.times{
fork{
sleep rand(0.3)
}
}
i = 0
while i<PN
cpid = Process.wait -1, Process::WNOHANG
if cpid
# p [i, cpid]
i += 1
end
begin
TCPServer.new(nil, 0).close
rescue
p $!
exit!
end
end
}
```