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| author | Bobby Bingham <koorogi@koorogi.info> | 2016-02-22 21:14:23 -0600 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2016-02-23 13:04:08 -0500 |
| commit | 225f6a6b5b7173b6655e4f5d49b5b9fea70bf3bb (patch) | |
| tree | 756a90a9fb1ea21f1142b024408a16a4eb8016f5 /src | |
| parent | 074e6b3fe3f2ad89b991f3d8ab0932035b312a62 (diff) | |
| download | musl-225f6a6b5b7173b6655e4f5d49b5b9fea70bf3bb.tar.gz musl-225f6a6b5b7173b6655e4f5d49b5b9fea70bf3bb.tar.xz musl-225f6a6b5b7173b6655e4f5d49b5b9fea70bf3bb.zip | |
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.
Diffstat (limited to 'src')
| -rw-r--r-- | src/internal/atomic.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/internal/atomic.h b/src/internal/atomic.h index 2097247e..6f37d252 100644 --- a/src/internal/atomic.h +++ b/src/internal/atomic.h @@ -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) { |