TYPE3

[iec.git] / src / type3_AndroidCloud / anbox-master / src / anbox / common / message_channel.cpp

diff --git a/src/type3_AndroidCloud/anbox-master/src/anbox/common/message_channel.cpp b/src/type3_AndroidCloud/anbox-master/src/anbox/common/message_channel.cpp
new file mode 100644 (file)
index 0000000..97c399b
--- /dev/null
+++ b/src/type3_AndroidCloud/anbox-master/src/anbox/common/message_channel.cpp
@@ -0,0 +1,64 @@
+// Copyright 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 "anbox/common/message_channel.h"
+
+namespace anbox {
+namespace common {
+MessageChannelBase::MessageChannelBase(size_t capacity) : pos_(0U),
+                                                          count_(0U),
+                                                          capacity_(capacity),
+                                                          lock_(),
+                                                          can_read_(),
+                                                          can_write_() {}
+
+MessageChannelBase::~MessageChannelBase() {}
+
+size_t MessageChannelBase::before_write() {
+  std::unique_lock<std::mutex> l(lock_, std::defer_lock);
+  lock_.lock();
+
+  while (count_ >= capacity_)
+    can_write_.wait(l);
+
+  size_t result = pos_ + count_;
+  if (result >= capacity_)
+    result -= capacity_;
+
+  return result;
+}
+
+void MessageChannelBase::after_write() {
+  count_++;
+  can_read_.notify_one();
+  lock_.unlock();
+}
+
+size_t MessageChannelBase::before_read() {
+  std::unique_lock<std::mutex> l(lock_, std::defer_lock);
+  lock_.lock();
+  while (count_ == 0)
+    can_read_.wait(l);
+  return pos_;
+}
+
+void MessageChannelBase::after_read() {
+  if (++pos_ == capacity_)
+    pos_ = 0U;
+  count_--;
+  can_write_.notify_one();
+  lock_.unlock();
+}
+}  // namespace common
+}  // namespace anbox