text: //
  // RWLock_Android.h
  //
  // $Id: //poco/1.7/Foundation/include/Poco/RWLock_Android.h#1 $
  //
  // 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
  