commit 19159f90020c04ac2f4dcb39424d740f765ed9a3
author Dianne Hackborn <hackbod@google.com> Mon May 06 14:25:20 2013 -0700
committer Alex Ray <aray@google.com> Tue Jul 30 13:57:01 2013 -0700
tree 242326311d0ad5ce0d2ce40cfc02f07a222479ae
parent d9ad7d8d73918d44d41811e9b4d0cc722dae338d

Add new Looper API to check whether the looper is idle.

This is just to support the watchdog to give it a faster
way to determine if a thread is deadlocked without having
to post a message to it.

Change-Id: I068dc8b9387caf94fe5811fb4aeb0f9b57b1a080

libs/utils/Looper.cpp

diff --git a/libs/utils/Looper.cpp b/libs/utils/Looper.cpp
index a5e6645..c51df2d 100644
--- a/libs/utils/Looper.cpp
+++ b/libs/utils/Looper.cpp
@@ -84,6 +84,8 @@
     LOG_ALWAYS_FATAL_IF(result != 0, "Could not make wake write pipe non-blocking.  errno=%d",
             errno);
 
+    mIdling = false;
+
     // Allocate the epoll instance and register the wake pipe.
     mEpollFd = epoll_create(EPOLL_SIZE_HINT);
     LOG_ALWAYS_FATAL_IF(mEpollFd < 0, "Could not create epoll instance.  errno=%d", errno);
@@ -214,9 +216,15 @@
     mResponses.clear();
     mResponseIndex = 0;
 
+    // We are about to idle.
+    mIdling = true;
+
     struct epoll_event eventItems[EPOLL_MAX_EVENTS];
     int eventCount = epoll_wait(mEpollFd, eventItems, EPOLL_MAX_EVENTS, timeoutMillis);
 
+    // No longer idling.
+    mIdling = false;
+
     // Acquire lock.
     mLock.lock();
 
@@ -558,4 +566,8 @@
     } // release lock
 }
 
+bool Looper::isIdling() const {
+    return mIdling;
+}
+
 } // namespace android