Tobias Schwinger <tschwinger@isonews2.com> writes:
Anthony,
Anthony Williams wrote:
POSIX provides pthread_once. We should use it. The Windows Vista functions look to supply a similar facility, and do at least allow the passing of a parameter to the routine without using TSS.
did you catch my comments on this one (elsewhere in this thread)?
No. Thanks for repeating them here.
<cite> The pthread-based implementation seems overly simplified: It won't compile for C++ functions that are not 'extern "C"' with some compilers. Further, what about exceptions from within pthread_once? </cite>
I haven't written a pthread-based implementation yet, so I'm not sure what you're referring to. Current boost call_once is not header-only, and doesn't support arbitrary callable objects (like my new Windows version does) --- only functions of a fixed signature.
I agree that TSS is not a good alternative, however (but I don't think it's needed for an improved pthread-based implementation).
I'm interested in what you expect an improved pthread-based implementation to look like. I'm thinking it will look very much like Peter's extended pthread_once that took an additional parameter (from N2178) --- i.e. using TSS to pass the parameter to the routine passed to pthread_once, which can then use this parameter data to invoke the user-supplied callable object. Have you got a better way? Anthony -- Anthony Williams Just Software Solutions Ltd - http://www.justsoftwaresolutions.co.uk Registered in England, Company Number 5478976. Registered Office: 15 Carrallack Mews, St Just, Cornwall, TR19 7UL