commit 9d27fbc8ced914f4726187920a7794b07eca3e71
author Hans Boehm <hboehm@google.com> Fri May 21 09:23:38 2021 -0700
committer Hans Boehm <hboehm@google.com> Tue May 25 16:34:18 2021 +0000
tree 0fd6eb99d0766ac78513d650d629f217273ab294
parent e3124d26d725a2b042b4409abfb30a39bb76794d

Improve suspension timeout diagnostic and fix race

Fix a data race on state_and_flags. Since the access was volatile
and there are system calls in the loop, this is extremely unlikey
to have casused the bug here, but ...

So, assuming this is still broken, produce more informative
output once we time out.

Remove unused argument from SuspendThreadByPeer(). It made the
logic more complicated and made it harder to reason about
correctness.

Remove dead code after LOG(FATAL, ...)

Bug: 181778559
Test: TreeHugger, temporarily paste log message into hotter path.
Change-Id: I6f3455925b3a3f4726a870150aeb54ea60a38d67