[c++-pthreads] Initialization of local static mutex

[Jean-Marc Bourguet]

Mark Mitchell wrote:
> Roland Schwarz wrote:

>> Now that you have brought up this issue I am curious which "other
>> issues" you are refering to.
> 
> void f() {
>   static int i = g();
> }
> 
> Here, you cannot do the initialization statically; it must be done the 
> first time that f() is called.  So, the key question is whether the 
> initialization is thread-safe.  Does the programmer have to change that 
> initialization to be thread-safe, using locks in f()?  Or does the 
> compiler take care of it?

I fail to see how the programmer can make the initialization thread-safe 
if the compiler doesn't take care of it?  Lack of memory barriers could 
make the bool indicating that the initialization is done visible, but 
not the written value.

-- 
Jean-Marc