问“嵌套”scoped_lock

EN

class A
{
    public:
    // ...
    methodA();
    methodB();

    protected:
    mutable boost::mutex m_mutex;
    sometype*  m_myVar;
}

A::methodA( int someParam )
{
    boost::mutex::scoped_lock myLock(m_mutex);
    m_myVar->doSomethingElse();
}

A::methodB( int someParam )
{
    boost::mutex::scoped_lock myLock(m_mutex);
    m_myVar->doSomething();
    this->methodA(someParam);
}