1 files changed, 94 insertions, 0 deletions
diff --git a/utils/Worker.cpp b/utils/Worker.cpp
new file mode 100644
index 0000000..1f30588
--- /dev/null
+++ b/utils/Worker.cpp
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2015-2016 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 "Worker.h"
+
+#include <sys/prctl.h>
+#include <sys/resource.h>
+
+namespace android {
+
+Worker::Worker(const char *name, int priority)
+    : name_(name), priority_(priority), exit_(false), initialized_(false) {
+}
+
+Worker::~Worker() {
+  Exit();
+}
+
+int Worker::InitWorker() {
+  std::lock_guard<std::mutex> lk(mutex_);
+  if (initialized())
+    return -EALREADY;
+
+  thread_ = std::unique_ptr<std::thread>(
+      new std::thread(&Worker::InternalRoutine, this));
+  initialized_ = true;
+  exit_ = false;
+
+  return 0;
+}
+
+void Worker::Exit() {
+  std::unique_lock<std::mutex> lk(mutex_);
+  exit_ = true;
+  if (initialized()) {
+    lk.unlock();
+    cond_.notify_all();
+    thread_->join();
+    initialized_ = false;
+  }
+}
+
+int Worker::WaitForSignalOrExitLocked(int64_t max_nanoseconds) {
+  int ret = 0;
+  if (should_exit())
+    return -EINTR;
+
+  std::unique_lock<std::mutex> lk(mutex_, std::adopt_lock);
+  if (max_nanoseconds < 0) {
+    cond_.wait(lk);
+  } else if (std::cv_status::timeout ==
+             cond_.wait_for(lk, std::chrono::nanoseconds(max_nanoseconds))) {
+    ret = -ETIMEDOUT;
+  }
+
+  // exit takes precedence on timeout
+  if (should_exit())
+    ret = -EINTR;
+
+  // release leaves mutex locked when going out of scope
+  lk.release();
+
+  return ret;
+}
+
+void Worker::InternalRoutine() {
+  setpriority(PRIO_PROCESS, 0, priority_);
+  prctl(PR_SET_NAME, name_.c_str());
+
+  std::unique_lock<std::mutex> lk(mutex_, std::defer_lock);
+
+  while (true) {
+    lk.lock();
+    if (should_exit())
+      return;
+    lk.unlock();
+
+    Routine();
+  }
+}
+}  // namespace android