Tidy gAborting.

Reduce scope to Runtime::Abort and short-cut recursive case earlier. gAborting
remains global to avoid two fatal errors in thread and the verifier.

Change-Id: Ibc893f891ffee9a763c65cde9507d99083d47b3f
diff --git a/runtime/base/logging.cc b/runtime/base/logging.cc
index b781d60..bdc4cf6 100644
--- a/runtime/base/logging.cc
+++ b/runtime/base/logging.cc
@@ -35,8 +35,6 @@
 
 LogVerbosity gLogVerbosity;
 
-unsigned int gAborting = 0;
-
 static LogSeverity gMinimumLogSeverity = INFO;
 static std::unique_ptr<std::string> gCmdLine;
 static std::unique_ptr<std::string> gProgramInvocationName;
diff --git a/runtime/base/logging.h b/runtime/base/logging.h
index ae83e33..a9cc99b 100644
--- a/runtime/base/logging.h
+++ b/runtime/base/logging.h
@@ -55,11 +55,6 @@
 // Global log verbosity setting, initialized by InitLogging.
 extern LogVerbosity gLogVerbosity;
 
-// 0 if not abort, non-zero if an abort is in progress. Used on fatal exit to prevents recursive
-// aborts. Global declaration allows us to disable some error checking to ensure fatal shutdown
-// makes forward progress.
-extern unsigned int gAborting;
-
 // Configure logging based on ANDROID_LOG_TAGS environment variable.
 // We need to parse a string that looks like
 //
diff --git a/runtime/base/mutex-inl.h b/runtime/base/mutex-inl.h
index cb69817..0206341 100644
--- a/runtime/base/mutex-inl.h
+++ b/runtime/base/mutex-inl.h
@@ -97,9 +97,7 @@
         }
       }
     }
-    if (gAborting == 0) {  // Avoid recursive aborts.
-      CHECK(!bad_mutexes_held);
-    }
+    CHECK(!bad_mutexes_held);
   }
   // Don't record monitors as they are outside the scope of analysis. They may be inspected off of
   // the monitor list.
@@ -114,7 +112,7 @@
     return;
   }
   if (level_ != kMonitorLock) {
-    if (kDebugLocking && gAborting == 0) {  // Avoid recursive aborts.
+    if (kDebugLocking) {
       CHECK(self->GetHeldMutex(level_) == this) << "Unlocking on unacquired mutex: " << name_;
     }
     self->SetHeldMutex(level_, NULL);
@@ -178,7 +176,7 @@
   bool result = (GetExclusiveOwnerTid() == SafeGetTid(self));
   if (kDebugLocking) {
     // Sanity debug check that if we think it is locked we have it in our held mutexes.
-    if (result && self != NULL && level_ != kMonitorLock && !gAborting) {
+    if (result && self != NULL && level_ != kMonitorLock) {
       CHECK_EQ(self->GetHeldMutex(level_), this);
     }
   }
diff --git a/runtime/base/mutex.cc b/runtime/base/mutex.cc
index aa2aefc..4957988 100644
--- a/runtime/base/mutex.cc
+++ b/runtime/base/mutex.cc
@@ -209,9 +209,7 @@
         }
       }
     }
-    if (gAborting == 0) {  // Avoid recursive aborts.
-      CHECK(!bad_mutexes_held);
-    }
+    CHECK(!bad_mutexes_held);
   }
 }
 
diff --git a/runtime/base/mutex.h b/runtime/base/mutex.h
index 9c93cc6..41b5f12 100644
--- a/runtime/base/mutex.h
+++ b/runtime/base/mutex.h
@@ -220,7 +220,7 @@
 
   // Assert that the Mutex is exclusively held by the current thread.
   void AssertExclusiveHeld(const Thread* self) {
-    if (kDebugLocking && (gAborting == 0)) {
+    if (kDebugLocking) {
       CHECK(IsExclusiveHeld(self)) << *this;
     }
   }
@@ -228,7 +228,7 @@
 
   // Assert that the Mutex is not held by the current thread.
   void AssertNotHeldExclusive(const Thread* self) {
-    if (kDebugLocking && (gAborting == 0)) {
+    if (kDebugLocking) {
       CHECK(!IsExclusiveHeld(self)) << *this;
     }
   }
@@ -318,7 +318,7 @@
 
   // Assert the current thread has exclusive access to the ReaderWriterMutex.
   void AssertExclusiveHeld(const Thread* self) {
-    if (kDebugLocking && (gAborting == 0)) {
+    if (kDebugLocking) {
       CHECK(IsExclusiveHeld(self)) << *this;
     }
   }
@@ -326,7 +326,7 @@
 
   // Assert the current thread doesn't have exclusive access to the ReaderWriterMutex.
   void AssertNotExclusiveHeld(const Thread* self) {
-    if (kDebugLocking && (gAborting == 0)) {
+    if (kDebugLocking) {
       CHECK(!IsExclusiveHeld(self)) << *this;
     }
   }
@@ -337,7 +337,7 @@
 
   // Assert the current thread has shared access to the ReaderWriterMutex.
   void AssertSharedHeld(const Thread* self) {
-    if (kDebugLocking && (gAborting == 0)) {
+    if (kDebugLocking) {
       // TODO: we can only assert this well when self != NULL.
       CHECK(IsSharedHeld(self) || self == NULL) << *this;
     }
@@ -347,7 +347,7 @@
   // Assert the current thread doesn't hold this ReaderWriterMutex either in shared or exclusive
   // mode.
   void AssertNotHeld(const Thread* self) {
-    if (kDebugLocking && (gAborting == 0)) {
+    if (kDebugLocking) {
       CHECK(!IsSharedHeld(self)) << *this;
     }
   }