65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*
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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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