1 files changed, 62 insertions, 0 deletions
diff --git a/cmds/statsd/src/logd/LogEventQueue.cpp b/cmds/statsd/src/logd/LogEventQueue.cpp
new file mode 100644
index 000000000000..146464bbe774
--- /dev/null
+++ b/cmds/statsd/src/logd/LogEventQueue.cpp
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#define DEBUG false  // STOPSHIP if true
+#include "Log.h"
+
+#include "LogEventQueue.h"
+
+namespace android {
+namespace os {
+namespace statsd {
+
+using std::unique_lock;
+using std::unique_ptr;
+
+unique_ptr<LogEvent> LogEventQueue::waitPop() {
+    std::unique_lock<std::mutex> lock(mMutex);
+
+    if (mQueue.empty()) {
+        mCondition.wait(lock, [this] { return !this->mQueue.empty(); });
+    }
+
+    unique_ptr<LogEvent> item = std::move(mQueue.front());
+    mQueue.pop();
+
+    return item;
+}
+
+bool LogEventQueue::push(unique_ptr<LogEvent> item, int64_t* oldestTimestampNs) {
+    bool success;
+    {
+        std::unique_lock<std::mutex> lock(mMutex);
+        if (mQueue.size() < mQueueLimit) {
+            mQueue.push(std::move(item));
+            success = true;
+        } else {
+            // safe operation as queue must not be empty.
+            *oldestTimestampNs = mQueue.front()->GetElapsedTimestampNs();
+            success = false;
+        }
+    }
+
+    mCondition.notify_one();
+    return success;
+}
+
+}  // namespace statsd
+}  // namespace os
+}  // namespace android