[Boost-users] semaphore

From: Amerio (amerio_at_[hidden])
Date: 2004-12-22 17:38:29

Hello,

I'm lacking a boost semaphore, so I tried to roll my own.
Being carefull with threads, I present here my version, hoping you gurus 
will spot any flaw.

class sem
{
    sem(unsigned count): m_count(count) {}

    void post()
    {
         boost::mutex::scoped_lock    lock(m_mutex);
         ++m_count;
         m_cond_.notify_one();
    }

    void wait()
    {
        boost::mutex::scoped_lock     lock(m_mutex);
        while ( m_count==0 ) m_cond.wait( lock );
        --m_count;
    }

private:
    unsigned    m_count;
    boost::mutex    m_mutex;
    boost::condition    m_cond;
};

Objective : I need a semaphore to sync many readers to a single input queue.
If you know another implementation or solution to this specific problem, 
your help is welcome.
Thank you.