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65 lines
1.9 KiB
65 lines
1.9 KiB
/* |
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* Copyright (C) 2010 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#ifndef ASYNCHRONOUS_CLOSE_MONITOR_H_included |
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#define ASYNCHRONOUS_CLOSE_MONITOR_H_included |
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#include <pthread.h> |
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/** |
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* AsynchronousCloseMonitor helps implement Java's asynchronous close semantics. |
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* |
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* AsynchronousCloseMonitor::init must be called before anything else. |
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* |
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* Every blocking I/O operation must be surrounded by an AsynchronousCloseMonitor |
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* instance. For example: |
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* |
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* { |
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* AsynchronousCloseMonitor monitor(fd); |
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* byteCount = ::read(fd, buf, sizeof(buf)); |
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* } |
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* |
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* To interrupt all threads currently blocked on file descriptor 'fd', call signalBlockedThreads: |
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* |
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* AsynchronousCloseMonitor::signalBlockedThreads(fd); |
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* |
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* To test to see if the interruption was due to the signalBlockedThreads call: |
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* |
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* monitor.wasSignaled(); |
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*/ |
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class AsynchronousCloseMonitor { |
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public: |
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explicit AsynchronousCloseMonitor(int fd); |
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~AsynchronousCloseMonitor(); |
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bool wasSignaled() const; |
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static void init(); |
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static void signalBlockedThreads(int fd); |
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private: |
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AsynchronousCloseMonitor* mPrev; |
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AsynchronousCloseMonitor* mNext; |
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pthread_t mThread; |
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int mFd; |
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bool mSignaled; |
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// Disallow copy and assignment. |
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AsynchronousCloseMonitor(const AsynchronousCloseMonitor&); |
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void operator=(const AsynchronousCloseMonitor&); |
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}; |
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#endif // ASYNCHRONOUS_CLOSE_MONITOR_H_included
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