commit d0b1dac94230c5e91639011e28160f34cc39c53e
author Mathieu Chartier <mathieuc@google.com> Fri Jun 10 17:04:20 2016 -0700
committer Mathieu Chartier <mathieuc@google.com> Thu Jun 16 18:01:22 2016 -0700
tree 420ca59d66304be9f1c3db41fdf3ca8e1b7e115c
parent 6017782485d30c4e440e53107dde03dc20d56a9a

Use ScopedObjectAccess in ThreadList::Dump

Prevent deadlocks if two different threads are calling Dump at the
same time:

Thread 1: Requests thread 2 to suspend
Thread 2: Requests thread 1 to suspend
Both threads are suspended and blocked on ScopedObjectAccess in
thread dumping.

Added to suspend all stress, reduced thread count to 4 temporarily
since this is the maximum number of simultaneous checkpoints.

Bug: 28988206
Bug: 26118154

(cherry picked from commit e99f53203904c23a26e53ca1bf6a4e45814146fe)

Change-Id: I9e4b8391ebad0bca0e42a03819c58c99ddba6b35