On Mon, May 27, 2013 at 8:42 PM, kalyan sita <kalyansit...@gmail.com> wrote: > I see that the below functions have specific assembly implementations for > os32,ia32 architectures: > > apr_atomic_add32 > apr_atomic_sub32 > apr_atomic_inc32 > apr_atomic_dec32 > apr_atomic_set32 > apr_atomic_cas32 > apr_atomic_casptr > apr_atomic_xchg32 > apr_atomic_xchgptr > > How frequently are these functions used. > I am planning to write arm specific code for the above functions in arm.c > file. > Can anyone help me where to start ?
You really should direct this at the d...@apr.apache.org list since it's not part of httpd (granted there's a lot of overlap between the projects). These are only used if the compiler doesn't provide the atomic builtins: http://gcc.gnu.org/onlinedocs/gcc-4.8.0/gcc/_005f_005fsync-Builtins.html#_005f_005fsync-Builtins If HAVE_ATOMIC_BUILTINS is true in include/arch/unix/apr_private.h then you don't need the ASM versions. One of the Linux Kernel hackers (Jon Masters) has a blog post up about ARM atomic operations: http://www.jonmasters.org/blog/2012/11/13/arm-atomic-operations/
