On Tue, Dec 10, 2019 at 11:09:41PM +0100, Hans Petter Selasky wrote:
> On 2019-12-10 22:58, John Baldwin wrote:
> > While here, add <sys/callout.h> to the manpage.
>
> FYI:
>
> Linux guys eliminated the "void *c_arg" in their timer implementation by
> using container_of() to get callback argument. We could possibly do the
> same!
#define container_of(ptr, type, member) ({ \
void *__mptr = (void *)(ptr); \
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
!__same_type(*(ptr), void), \
"pointer type mismatch in container_of()"); \
((type *)(__mptr - offsetof(type, member))); })
That's one of those things that make Linux so unpleasant to work with.
Frankly, I don't think we want that for FreeBSD.
./danfe
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