| /* |
| * Copyright (C) 2010 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. |
| */ |
| |
| #ifndef ASYNCHRONOUS_CLOSE_MONITOR_H_included |
| #define ASYNCHRONOUS_CLOSE_MONITOR_H_included |
| |
| #include <pthread.h> |
| |
| /** |
| * AsynchronousCloseMonitor helps implement Java's asynchronous close semantics. |
| * |
| * AsynchronousCloseMonitor::init must be called before anything else. |
| * |
| * Every blocking I/O operation must be surrounded by an AsynchronousCloseMonitor |
| * instance. For example: |
| * |
| * { |
| * AsynchronousCloseMonitor monitor(fd); |
| * byteCount = ::read(fd, buf, sizeof(buf)); |
| * } |
| * |
| * To interrupt all threads currently blocked on file descriptor 'fd', call signalBlockedThreads: |
| * |
| * AsynchronousCloseMonitor::signalBlockedThreads(fd); |
| * |
| * To test to see if the interruption was due to the signalBlockedThreads call: |
| * |
| * monitor.wasSignaled(); |
| */ |
| class AsynchronousCloseMonitor { |
| public: |
| explicit AsynchronousCloseMonitor(int fd); |
| ~AsynchronousCloseMonitor(); |
| bool wasSignaled() const; |
| |
| static void init(); |
| |
| static void signalBlockedThreads(int fd); |
| |
| private: |
| AsynchronousCloseMonitor* mPrev; |
| AsynchronousCloseMonitor* mNext; |
| pthread_t mThread; |
| int mFd; |
| bool mSignaled; |
| |
| // Disallow copy and assignment. |
| AsynchronousCloseMonitor(const AsynchronousCloseMonitor&); |
| void operator=(const AsynchronousCloseMonitor&); |
| }; |
| |
| #endif // ASYNCHRONOUS_CLOSE_MONITOR_H_included |