/usr/include/Poco/RWLock_Android.h is in libpoco-dev 1.8.0.1-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// RWLock_Android.h
//
// Library: Foundation
// Package: Threading
// Module: RWLock
//
// Definition of the RWLockImpl class for Android Threads.
//
// Copyright (c) 2004-2011, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_RWLock_Android_INCLUDED
#define Foundation_RWLock_Android_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Exception.h"
#include <pthread.h>
#include <errno.h>
namespace Poco {
class Foundation_API RWLockImpl
{
protected:
RWLockImpl();
~RWLockImpl();
void readLockImpl();
bool tryReadLockImpl();
void writeLockImpl();
bool tryWriteLockImpl();
void unlockImpl();
private:
pthread_mutex_t _mutex;
};
//
// inlines
//
inline void RWLockImpl::readLockImpl()
{
if (pthread_mutex_lock(&_mutex))
throw SystemException("cannot lock reader/writer lock");
}
inline bool RWLockImpl::tryReadLockImpl()
{
int rc = pthread_mutex_trylock(&_mutex);
if (rc == 0)
return true;
else if (rc == EBUSY)
return false;
else
throw SystemException("cannot lock reader/writer lock");
}
inline void RWLockImpl::writeLockImpl()
{
if (pthread_mutex_lock(&_mutex))
throw SystemException("cannot lock reader/writer lock");
}
inline bool RWLockImpl::tryWriteLockImpl()
{
int rc = pthread_mutex_trylock(&_mutex);
if (rc == 0)
return true;
else if (rc == EBUSY)
return false;
else
throw SystemException("cannot lock reader/writer lock");
}
inline void RWLockImpl::unlockImpl()
{
if (pthread_mutex_unlock(&_mutex))
throw SystemException("cannot unlock reader/writer lock");
}
} // namespace Poco
#endif // Foundation_RWLock_Android_INCLUDED
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