Avoid calling scheduleTimeout for a thread that is mostly busy
Avoid calling scheduleTimeout for a thread that is mostly busy

Summary: Avoid calling scheduleTimeout for a thread that is mostly busy

Reviewed By: yfeldblum

Differential Revision: D21531280

fbshipit-source-id: b89254ebc3662c951b3b181b3a2777afb9e3f4fe

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly