[haiku-gsoc] Re: Implementation Queries
- From: Julian Harnath <julian.harnath@xxxxxxxxxxxxxx>
- To: <haiku-gsoc@xxxxxxxxxxxxx>
- Date: Fri, 16 Jun 2017 22:36:04 +0200
Hey,
On 16.06.2017 20:43, Vivek Roy wrote:
Started a new thread as the questions are no longer related to Licensing.
asm/atomic.h requires declarations of functions atomic_cmpset_int and
atomic_load_acq_int. Any help with those?
For the expected behaviour of these, see [0].Assuming gcc5 usage, you
can use gcc builtins [1]to implement them.
atomic_cmpset_int() can be implemented using gcc's
__atomic_compare_exchange() with memorder set to __ATOMIC_RELAXED.
atomic_load_acq_int() can use gcc's __atomic_load() with memorder set to
__ATOMIC_ACQUIRE.
Feel free to ask if you need further help with this.
[0]
https://www.freebsd.org/cgi/man.cgi?query=atomic&sektion=9
[1]
https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
Regards
Julian
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