Proposal: provide cas and barriers symbols even without -threaded
carter.schonwald at gmail.com
Fri Jul 19 17:41:23 CEST 2013
I guess I should find the time to finish the CAS primop work I volunteered
to do then. Ill look into in a few days.
On Friday, July 19, 2013, Simon Marlow wrote:
> On 18/07/13 14:17, Ryan Newton wrote:
>> The "atomic-primops" library depends on symbols such as
>> store_load_barrier and "cas", which are defined in SMP.h. Thus the
>> result is that if the program is linked WITHOUT "-threaded", the user
>> gets a linker error about undefined symbols.
>> The specific place it's used is in the 'foreign "C"' bits of this .cmm
>> I'm trying to explore hacks that will enable me to pull in those
>> functions during compile time, without duplicating a whole bunch of code
>> from the RTS. But it's a fragile business.
>> It seems to me that some of these routines have general utility. In
>> future versions of GHC, could we consider linking in those routines
>> irrespective of "-threaded"?
> We should make the non-THREADED versions EXTERN_INLINE too, so that there
> will be (empty) functions to call in rts/Inlines.c. Want to submit a patch?
> A better solution would be to make them into primops. You don't really
> want to be calling out to a C function to implement a memory barrier. We
> have this for write_barrier(), but none of the others so far. Of couse
> that's a larger change.
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