Merge "Binder: avoid GC while holding lock" into main
diff --git a/core/jni/android_util_Binder.cpp b/core/jni/android_util_Binder.cpp
index 2068bd7..46b4695 100644
--- a/core/jni/android_util_Binder.cpp
+++ b/core/jni/android_util_Binder.cpp
@@ -466,10 +466,25 @@
public:
sp<JavaBBinder> get(JNIEnv* env, jobject obj)
{
- AutoMutex _l(mLock);
- sp<JavaBBinder> b = mBinder.promote();
- if (b == NULL) {
- b = new JavaBBinder(env, obj);
+ sp<JavaBBinder> b;
+ {
+ AutoMutex _l(mLock);
+ // must take lock to promote because we set the same wp<>
+ // on another thread.
+ b = mBinder.promote();
+ }
+
+ if (b) return b;
+
+ // b/360067751: constructor may trigger GC, so call outside lock
+ b = new JavaBBinder(env, obj);
+
+ {
+ AutoMutex _l(mLock);
+ // if it was constructed on another thread in the meantime,
+ // return that. 'b' will just get destructed.
+ if (sp<JavaBBinder> b2 = mBinder.promote(); b2) return b2;
+
if (mVintf) {
::android::internal::Stability::markVintf(b.get());
}