利用boost shared_mutex來實作read / write lock

 

How to implement a mulltiple read single write locker? This is the sample code by using boost shared_mutex. The other classes are using shared_lock, upgrade_lock and upgrade_to_unique_lock.

 

using namespace boost;

typedef boost::shared_mutex rwmutex;

typedef boost::shared_lock<rwmutex> readLock; 

typedef boost::upgrade_lock<rwmutex> upgradeLock;

typedef boost::upgrade_to_unique_lock<rwmutex> writeLock;

 

 

rwmutex  _rwmutex; 

 void readOnly() {

    {

        readLock rdlock(_rwmutex);

        ... do something ... 

    }

} 

 

void writeOnly() {

    {
        upgradeLock lock(_rwmutex);

        writeLock wLock(lock);

        ... do something

    }

}