Initial commit

tools/cmgen/src/JobQueue.cpp

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+/*
+ * Copyright (C) 2015 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 "JobQueue.h"
+
+JobQueue::Job JobQueue::pop() {
+    Job job;
+    std::lock_guard<std::mutex> lock(m_lock);
+    if (!m_queue.empty()) {
+        std::swap(job, m_queue.front());
+        m_queue.pop_front();
+    }
+    return job;
+}
+
+void JobQueue::enqueue(JobQueue::Job&& job) {
+    std::lock_guard<std::mutex> lock(m_lock);
+    m_queue.push_back(std::forward<JobQueue::Job>(job));
+}
+
+bool JobQueue::runJobIfAny() {
+    Job job(pop());
+    // call the job without holding our lock
+    if (job) {
+        job();
+        return true;
+    }
+    return false;
+}
+
+void JobQueue::runAllJobs() {
+    std::deque<Job> q;
+    std::unique_lock<std::mutex> lock(m_lock);
+    std::swap(q, m_queue);
+    lock.unlock();
+    for (auto& job : q) {
+        job();
+    }
+}
+
+bool JobQueue::isEmpty() const {
+    std::lock_guard<std::mutex> lock(m_lock);
+    return m_queue.empty();
+}