Re: [TCLCORE] CFV: TIP #435

On Mon, Aug 3, 2015 at 6:34 PM, Gustaf Neumann <neum...@wu.ac.at> wrote:

> pthread_atfork() is called only once per process, its callbacks cannot> be unregistered.>


That's a sad under-design on libpthread's part, ain't it ? ;-)
But the Tcl library, among other things, somehow ambitions to be a "better
libc" (at least at times).
So, what about fixing that wart:

    - call once and for all early in Tcl's init (like T_FE)
pthread_atfork(TclAtforkHandler)
    - let TclAtForkHandler be:

          lock(&atfmutex);
          for(p=atflist;p;p=p->next) p();
          unlock(&atfmutex);

     - of course a couple of convenience routine would allow to add/remove
callbacks to atflist any time, in a thread-safe way thanks to atfmutex

-Alex

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