Using a read/write mutex - C++ boost

C++ examples for boost:thread

  1. HOME
  2. C++
  3. boost
  4. thread

Description

Using a read/write mutex 

#include <iostream>
#include <boost/thread/thread.hpp>
#include <boost/thread/read_write_mutex.hpp>
#include <string>

template<typename T>
class Queue {
public:
   Queue() :  rwMutex_(boost::read_write_scheduling_policy::writer_priority) {}
  ~Queue() {}

   void enqueue(const T& x) {
      boost::read_write_mutex::scoped_write_lock writeLock(rwMutex_);
      list_.push_back(x);
   }

   T dequeue() {
      boost::read_write_mutex::scoped_write_lock writeLock(rwMutex_);

      if (list_.empty())
         throw "empty!";

      T tmp = list_.front();

      list_.pop_front();

      return(tmp);
   }

   T getFront() {
      boost::read_write_mutex::scoped_read_lock readLock(rwMutex_);

      if (list_.empty())
         throw "empty!";
      return(list_.front());
   }

private:
   std::list<T> list_;
   boost::read_write_mutex rwMutex_;
};

Queue<std::string> queueOfStrings;

void sendSomething() {
   std::string s;
   for (int i = 0; i < 10; ++i) {
      queueOfStrings.enqueue("Cyrus");
   }
}

void checkTheFront() {
   std::string s;

   for (int i = 0; i < 10; ++i) {
      try {s = queueOfStrings.getFront();}
      catch(...) {}
   }
}

int main() {

   boost::thread thr1(sendSomething);
   boost::thread_group grp;

   grp.create_thread(checkTheFront);
   grp.create_thread(checkTheFront);
   grp.create_thread(checkTheFront);
   grp.create_thread(checkTheFront);

   thr1.join();
   grp.join_all();
}

Related Tutorials