1 files changed, 56 insertions, 0 deletions
diff --git a/runtime/monitor_pool.cc b/runtime/monitor_pool.cc
new file mode 100644
index 0000000..eadd7a6
--- /dev/null
+++ b/runtime/monitor_pool.cc
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2014 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 "monitor_pool.h"
+
+#include "base/logging.h"
+#include "base/mutex-inl.h"
+#include "monitor.h"
+
+namespace art {
+
+MonitorPool::MonitorPool() : allocated_ids_lock_("allocated monitor ids lock") {
+}
+
+Monitor* MonitorPool::LookupMonitorFromTable(MonitorId mon_id) {
+  ReaderMutexLock mu(Thread::Current(), allocated_ids_lock_);
+  return table_.Get(mon_id);
+}
+
+MonitorId MonitorPool::AllocMonitorIdFromTable(Thread* self, Monitor* mon) {
+  WriterMutexLock mu(self, allocated_ids_lock_);
+  for (size_t i = 0; i < allocated_ids_.size(); ++i) {
+    if (!allocated_ids_[i]) {
+      allocated_ids_.set(i);
+      MonitorId mon_id = i + 1;  // Zero is reserved to mean "invalid".
+      table_.Put(mon_id, mon);
+      return mon_id;
+    }
+  }
+  LOG(FATAL) << "Out of internal monitor ids";
+  return 0;
+}
+
+void MonitorPool::ReleaseMonitorIdFromTable(MonitorId mon_id) {
+  WriterMutexLock mu(Thread::Current(), allocated_ids_lock_);
+  DCHECK(table_.Get(mon_id) != nullptr);
+  table_.erase(mon_id);
+  --mon_id;  // Zero is reserved to mean "invalid".
+  DCHECK(allocated_ids_[mon_id]) << mon_id;
+  allocated_ids_.reset(mon_id);
+}
+
+}  // namespace art