1 files changed, 63 insertions, 0 deletions
diff --git a/runtime/barrier.cc b/runtime/barrier.cc
new file mode 100644
index 0000000..250d468
--- /dev/null
+++ b/runtime/barrier.cc
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+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "barrier.h"
+
+#include "base/mutex.h"
+#include "thread.h"
+
+namespace art {
+
+Barrier::Barrier(int count)
+    : count_(count),
+      lock_("GC barrier lock"),
+      condition_("GC barrier condition", lock_) {
+}
+
+void Barrier::Pass(Thread* self) {
+  MutexLock mu(self, lock_);
+  SetCountLocked(self, count_ - 1);
+}
+
+void Barrier::Wait(Thread* self) {
+  Increment(self, -1);
+}
+
+void Barrier::Init(Thread* self, int count) {
+  MutexLock mu(self, lock_);
+  SetCountLocked(self, count);
+}
+
+void Barrier::Increment(Thread* self, int delta) {
+  MutexLock mu(self, lock_);
+  SetCountLocked(self, count_ + delta);
+  if (count_ != 0) {
+    condition_.Wait(self);
+  }
+}
+
+void Barrier::SetCountLocked(Thread* self, int count) {
+  count_ = count;
+  if (count_ == 0) {
+    condition_.Broadcast(self);
+  }
+}
+
+Barrier::~Barrier() {
+  CHECK(!count_) << "Attempted to destroy barrier with non zero count";
+}
+
+}