[kudu-CR] threadpool: new test for pools with no max threads

["Adar Dembo (Code Review)" <ge...@cloudera.org>]

Hello Dan Burkert, David Ribeiro Alves, Alexey Serbin,

I'd like you to reexamine a change.  Please visit

    http://gerrit.cloudera.org:8080/6945

to look at the new patch set (#8).

Change subject: threadpool: new test for pools with no max_threads
......................................................................

threadpool: new test for pools with no max_threads

This test ensures that a pool created with effectively no max_threads works
as expected. That is:
1. Tokenless tasks should trigger the creation of a new thread.
2. Token-based tasks can create new threads, but only up to the number of
   tokens submitted against.

I intend to use this "feature" to consolidate some Raft thread pools where a
num_cpus upper bound may be undesirable (i.e. where tasks submitted to the
pools may result in blocking IO).

Change-Id: I37d0bd0a05098bcc1a81ec9f1ac33e74e98781e4
---
M src/kudu/util/threadpool-test.cc
M src/kudu/util/threadpool.h
2 files changed, 70 insertions(+), 17 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/45/6945/8
-- 
To view, visit http://gerrit.cloudera.org:8080/6945
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I37d0bd0a05098bcc1a81ec9f1ac33e74e98781e4
Gerrit-PatchSet: 8
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Dan Burkert <da...@apache.org>
Gerrit-Reviewer: David Ribeiro Alves <da...@gmail.com>
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>