[Libsigcx-main] Re: [sigc] Re: [gtkmm] libsigcx and gtkmm 2.4

[Christer P. <pa...@no...>]

Daniel Elstner wrote:
> 
> Sure, but the caller passes in an already constructed std::string.  As I
> said above, you need to lock before constructing the object.
> 

Hmmm. Let's see what's going on here...

1. An string object is created.
2. The shared mutex is locked.
3. A shared copy of the string object is made.
4. The mutex is unlocked.
5. The original string object is destroyed.

Now, the problem I see here is that the original string is destroyed 
after the mutex is unlocked. So if string isn't thread-safe this is a 
problem.

But if fail to see how locking the mutex before creating the original 
string would make any difference. Successfully locking or unlocking a 
mutex is guaranteed to synchronize memory with respect to other threads 
regardless of whether that memory was touched before or after the mutex 
was locked.

--
Christer Palm