RepoMirrors
/
musl
mirror of git://git.musl-libc.org/musl
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

allow implementing a_cas_p with pointer-sized ll/sc 

No current ports do this, but it will be useful for porting to 64-bit ll/sc
architectures, such as mips64 and powerpc64.
This commit is contained in:
Bobby Bingham 2016-02-22 21:14:23 -06:00 committed by Rich Felker
parent 074e6b3fe3
commit 225f6a6b5b
1 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/internal/atomic.h
View File

@ -82,6 +82,23 @@ static inline int a_fetch_or(volatile int *p, int v)
#endif
#ifdef a_ll_p
#ifndef a_cas_p
#define a_cas_p a_cas_p
static inline void *a_cas_p(volatile void *p, void *t, void *s)
{
void *old;
a_pre_llsc();
do old = a_ll_p(p);
while (old==t && !a_sc_p(p, s));
a_post_llsc();
return old;
}
#endif
#endif
#ifndef a_cas
#error missing definition of a_cas
#endif
@ -209,6 +226,7 @@ static inline void a_or_64(volatile uint64_t *p, uint64_t v)
#endif
#ifndef a_cas_p
typedef char a_cas_p_undefined_but_pointer_not_32bit[-sizeof(char) == 0xffffffff ? 1 : -1];
#define a_cas_p a_cas_p
static inline void *a_cas_p(volatile void *p, void *t, void *s)
{