tree de14ab8b610f43a2c2c4c02f4ac67d614919fde2
parent 031ddea20cb311dfdb3bd16a13750f9cb426b299
author Ian Rogers <irogers@google.com> 1405648362 -0700
committer Ian Rogers <irogers@google.com> 1405648780 -0700

Avoid race in single thread suspension.

Don't allow more than one concurrent single thread suspension to avoid
potential cycles and deadlocks where threads try to suspend each other.
Bug: 16364458, 16354227

Change-Id: I907f1d5591a6aa5c241d37d6b4a34f968f98df77