Re: C++ Thread Class

"James Kanze" <>
7 Dec 2006 12:12:59 -0500
red floyd wrote:

alex wrote: wrote:

I am writting a Thread class with using pthread library. I have some
problem in saving thread function type and argument type. How to make
Thread class generic ?

Have you considered inheritance?

class Thread
    void start(void);
    virtual void run(void) = 0;

class MyThread
    : public Thread
    virtual void run(void);

Better would be:

class Thread
     static void start(void *param)
     virtual void run() = 0;
     virtual ~Thread() {}


In general, there are two ways to attain genericity in C++,
inheritance and templates. Inheritance allows runtime
genericity, and is thus more flexible. On the other hand, it
requires reference semantics in order to work. Templates must
be resolved at compile time, but allow copy semantics. In this
particular case, I can't really think of a good use for the
added flexibility of run-time genericity, and you definitly want
copy semantics, if at all possible, to limit the risk of
multiple threads accessing the same data, so the choice is
obvious. Boost::threads handles this aspect particularly well.
(One thing I'm not sure of, however: can the functional object
used by a boost::thread contain e.g. an std::auto_ptr, or do
they impose the same Copiable/Assignable constraints that STL
containers do? Because passing data between threads is one
place where std::auto_ptr really shines.)

James Kanze (GABI Software)
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