folly/MPMCQueue sizeGuess should return a signed int
authorNathan Bronson <ngbronson@fb.com>
Fri, 19 Jul 2013 18:12:59 +0000 (11:12 -0700)
committerSara Golemon <sgolemon@fb.com>
Wed, 28 Aug 2013 21:30:10 +0000 (14:30 -0700)
commitff1046b8a239d5f7e58e2756f6b7eb8ec830ff61
tree7787a71d544f74e89f128c74c11551e958434e6e
parent8035fc11627f1739125066bee3951627adfce61e
folly/MPMCQueue sizeGuess should return a signed int

Summary:
Like size(), sizeGuess() is allowed to return a negative value,
so it should be ssize_t instead of uint64_t.

Test Plan: fbmake, wait for contbuild

Reviewed By: tudorb@fb.com

FB internal diff: D893075
folly/MPMCQueue.h