commit 82f5b811b2767289ebb8a9e6af1919c3b72b5121
author Eric Laurent <elaurent@google.com> Wed Aug 17 13:53:12 2016 +0200
committer Adam Seaton <aseaton@google.com> Sat Aug 20 23:25:34 2016 +0000
tree c1bff8e75017ef08e74973413f88d1d89cb78a1a
parent 1d320b9d14f7e136b3d1a94e977ce2a08459f49b

DO NOT MERGE ANYWHERE (nyc-dr1-dev) audioflinger: add watchdog on main mutex

Check every 10 seconds if main audioflinger mutex can be acquired and
trigger audioserver process restart if not.
This will allow to capture tombstones of locked up situations and avoid
the disruption of a system_server restart.

Bug: 30737845
Bug: 30388410
Change-Id: I8a78b8cf813982f70ea598a6d42affc0ecaa76c9
(cherry picked from commit 17a58b2560c38a8e31a38186f9ab6eb98a38e229)

services/audioflinger/AudioFlinger.cpp

diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 79f4a66..c32eadd 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -246,7 +246,9 @@
     }
 
     mPatchPanel = new PatchPanel(this);
-
+    // FIXME: bug 30737845: trigger audioserver restart if main audioflinger lock
+    // is held continuously for more than 3 seconds
+    mLockWatch = new LockWatch(mLock, String8("AudioFlinger"));
     mMode = AUDIO_MODE_NORMAL;
 }
 
@@ -279,6 +281,7 @@
             }
         }
     }
+    mLockWatch->requestExitAndWait();
 }
 
 static const char * const audio_interfaces[] = {