Re: Threads

From: scleary_at_[hidden]
Date: 2000-08-05 11:53:34

> > All static initialization is done before dynamic initialization (and
> > therefore before any threads could be created).
> 
> I'm not sure this works even in pthreads (though I'm not as familiar 
> with them or with this particular issue).  C++ uses constructors 
> during initialization of objects, which is code that could well 
> create a thread.  I don't see how this can be prevented.

The difference I was pointing out is the difference between static
initialization and dynamic initialization.  All constructors are dynamic
initialization.  Note the following code:
  extern int static_init;
  int func() { return static_init; }
  int dynamic_init = func();
  int static_init = 13;

When main() starts, dynamic_init will be equal to 13.

The idea is that if a mutex variable can be statically initialized, then it
*must* be initialized before *any* dynamic initialization (such as
constructors) take place.  See [3.6.2/1] in the Standard.

        -Steve