Revert^17 "Thread suspension cleanup and deadlock fix"

This reverts commit c6371b52df0da31acc174a3526274417b7aac0a7.

Reason for revert: This seems to have two remaining issues:

1. The second DCHECK in WaitForFlipFunction is not completely guaranteed to hold, resulting in failures for 658-fp-read-barrier.
2. WaitForSuspendBarrier seems to time out occasionally, possibly spuriously so. We fail when the futex times out once. That's probably incompatible with the app freezer. We should retry a few times.

Change-Id: Ibd8909b31083fc29e6d4f1fcde003d08eb16fc0a

1 files changed, 7 insertions, 1 deletions

diff --git a/runtime/native/java_lang_Thread.cc b/runtime/native/java_lang_Thread.cc
index fd67a0a7fa..570c554782 100644
--- a/runtime/native/java_lang_Thread.cc
+++ b/runtime/native/java_lang_Thread.cc
@@ -147,8 +147,11 @@ static void Thread_setNativeName(JNIEnv* env, jobject peer, jstring java_name) {
   // thread list lock to avoid this, as setting the thread name causes mutator to lock/unlock
   // in the DDMS send code.
   ThreadList* thread_list = Runtime::Current()->GetThreadList();
+  bool timed_out;
   // Take suspend thread lock to avoid races with threads trying to suspend this one.
-  Thread* thread = thread_list->SuspendThreadByPeer(peer, SuspendReason::kInternal);
+  Thread* thread = thread_list->SuspendThreadByPeer(peer,
+                                                    SuspendReason::kInternal,
+                                                    &timed_out);
   if (thread != nullptr) {
     {
       ScopedObjectAccess soa(env);
@@ -156,6 +159,9 @@ static void Thread_setNativeName(JNIEnv* env, jobject peer, jstring java_name) {
     }
     bool resumed = thread_list->Resume(thread, SuspendReason::kInternal);
     DCHECK(resumed);
+  } else if (timed_out) {
+    LOG(ERROR) << "Trying to set thread name to '" << name.c_str() << "' failed as the thread "
+        "failed to suspend within a generous timeout.";
   }
 }