1 files changed, 115 insertions, 0 deletions
diff --git a/runtimes/nn/runtime/Callbacks.cpp b/runtimes/nn/runtime/Callbacks.cpp
new file mode 100644
index 000000000..f9a7e6494
--- /dev/null
+++ b/runtimes/nn/runtime/Callbacks.cpp
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
+ * Copyright (C) 2017 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 "Callbacks.h"
+#include "Logging.h"
+
+namespace nnfw {
+namespace rt {
+
+CallbackBase::CallbackBase() : mNotified(false) {}
+
+CallbackBase::~CallbackBase() {
+    // Note that we cannot call CallbackBase::join_thread from here:
+    // CallbackBase is intended to be reference counted, and it is possible that
+    // the reference count drops to zero in the bound thread, causing the
+    // bound thread to call this destructor. If a thread tries to join
+    // itself, it throws an exception, producing a message like the
+    // following:
+    //
+    //     terminating with uncaught exception of type std::__1::system_error:
+    //     thread::join failed: Resource deadlock would occur
+}
+
+void CallbackBase::wait() {
+    std::unique_lock<std::mutex> lock(mMutex);
+    mCondition.wait(lock, [this]{return mNotified;});
+    join_thread_locked();
+}
+
+bool CallbackBase::on_finish(std::function<bool(void)> post_work) {
+    std::lock_guard<std::mutex> lock(mMutex);
+    if (mPostWork != nullptr) {
+        LOG(ERROR) << "CallbackBase::on_finish -- a post-work function has already been bound to "
+                   "this callback object";
+        return false;
+    }
+    if (post_work == nullptr) {
+        LOG(ERROR) << "CallbackBase::on_finish -- the new post-work function is invalid";
+        return false;
+    }
+    mPostWork = std::move(post_work);
+    return true;
+}
+
+bool CallbackBase::bind_thread(std::thread&& asyncThread) {
+    std::lock_guard<std::mutex> lock(mMutex);
+    if (mThread.joinable()) {
+        LOG(ERROR) << "CallbackBase::bind_thread -- a thread has already been bound to this "
+                   "callback object";
+        return false;
+    }
+    if (!asyncThread.joinable()) {
+        LOG(ERROR) << "CallbackBase::bind_thread -- the new thread is not joinable";
+        return false;
+    }
+    mThread = std::move(asyncThread);
+    return true;
+}
+
+void CallbackBase::join_thread() {
+    std::lock_guard<std::mutex> lock(mMutex);
+    join_thread_locked();
+}
+
+void CallbackBase::notify() {
+    {
+        std::lock_guard<std::mutex> lock(mMutex);
+        mNotified = true;
+        if (mPostWork != nullptr) {
+            bool success = mPostWork();
+            if (!success) {
+                LOG(ERROR) << "CallbackBase::notify -- post work failed";
+            }
+        }
+    }
+    mCondition.notify_all();
+}
+
+void CallbackBase::join_thread_locked() {
+    if (mThread.joinable()) {
+        mThread.join();
+    }
+}
+
+ExecutionCallback::ExecutionCallback() : mErrorStatus(ErrorStatus::GENERAL_FAILURE) {}
+
+ExecutionCallback::~ExecutionCallback() {}
+
+Return<void> ExecutionCallback::notify(ErrorStatus errorStatus) {
+    mErrorStatus = errorStatus;
+    CallbackBase::notify();
+    return Void();
+}
+
+ErrorStatus ExecutionCallback::getStatus() {
+    wait();
+    return mErrorStatus;
+}
+
+}  // namespace rt
+}  // namespace nnfw