>> Now, since we are using C++ in HarfBuzz, I wonder if we can use
>> constructors to initialize the static mutexes automatically?
>
> This little gem seems to do the trick:
>
> struct hb_static_mutex_t : hb_mutex_t
> {
> hb_static_mutex_t (void) {
> hb_mutex_init (this);
> }
> };
>
>
> What do you think?
I _think_ this is OK, because critical sections are allowed be initialised in
DllMain (according to http://msdn.microsoft.com/en-us/library/ms682583.aspx):
"There are serious limits on what you can do in a DLL entry point. ... If your
DLL is linked with the C run-time library (CRT), the entry point provided by
the CRT calls the constructors and destructors for global and static C++
objects. Therefore, these restrictions for DllMain also apply to constructors
and destructors and any code that is called from them" but "For example,
DllMain can create synchronization objects such as critical sections and
mutexes"
It does seem like this would need a destructor, too, to avoid leaking
CRITICAL_SECTION objects (unless they're only ever destroyed at process
shutdown, when it wouldn't be necessary). Of course, then the struct would need
to be made non-copyable to avoid inadvertent early destruction.
Bradley
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