1 files changed, 20 insertions, 6 deletions
diff --git a/runtime/gc/heap.cc b/runtime/gc/heap.cc
index 10fe64e1e0..d420500592 100644
--- a/runtime/gc/heap.cc
+++ b/runtime/gc/heap.cc
@@ -142,6 +142,7 @@ Heap::Heap(size_t initial_size, size_t growth_limit, size_t min_free, size_t max
       zygote_creation_lock_("zygote creation lock", kZygoteCreationLock),
       zygote_space_(nullptr),
       large_object_threshold_(large_object_threshold),
+      gc_request_pending_(false),
       collector_type_running_(kCollectorTypeNone),
       last_gc_type_(collector::kGcTypeNone),
       next_gc_type_(collector::kGcTypePartial),
@@ -409,6 +410,8 @@ Heap::Heap(size_t initial_size, size_t growth_limit, size_t min_free, size_t max
   gc_complete_lock_ = new Mutex("GC complete lock");
   gc_complete_cond_.reset(new ConditionVariable("GC complete condition variable",
                                                 *gc_complete_lock_));
+  gc_request_lock_ = new Mutex("GC request lock");
+  gc_request_cond_.reset(new ConditionVariable("GC request condition variable", *gc_request_lock_));
   heap_trim_request_lock_ = new Mutex("Heap trim request lock");
   last_gc_size_ = GetBytesAllocated();
   if (ignore_max_footprint_) {
@@ -3038,12 +3041,7 @@ void Heap::RequestConcurrentGC(Thread* self) {
       self->IsHandlingStackOverflow()) {
     return;
   }
-  JNIEnv* env = self->GetJniEnv();
-  DCHECK(WellKnownClasses::java_lang_Daemons != nullptr);
-  DCHECK(WellKnownClasses::java_lang_Daemons_requestGC != nullptr);
-  env->CallStaticVoidMethod(WellKnownClasses::java_lang_Daemons,
-                            WellKnownClasses::java_lang_Daemons_requestGC);
-  CHECK(!env->ExceptionCheck());
+  NotifyConcurrentGCRequest(self);
 }
 
 void Heap::ConcurrentGC(Thread* self) {
@@ -3276,5 +3274,21 @@ void Heap::ClearMarkedObjects() {
   }
 }
 
+void Heap::WaitForConcurrentGCRequest(Thread* self) {
+  ScopedThreadStateChange tsc(self, kBlocked);
+  MutexLock mu(self, *gc_request_lock_);
+  while (!gc_request_pending_) {
+    gc_request_cond_->Wait(self);
+  }
+  gc_request_pending_ = false;
+}
+
+void Heap::NotifyConcurrentGCRequest(Thread* self) {
+  ScopedThreadStateChange tsc(self, kBlocked);
+  MutexLock mu(self, *gc_request_lock_);
+  gc_request_pending_ = true;
+  gc_request_cond_->Signal(self);
+}
+
 }  // namespace gc
 }  // namespace art