diff options
Diffstat (limited to 'erts/include/internal/gcc/ethr_atomic.h')
| -rw-r--r-- | erts/include/internal/gcc/ethr_atomic.h | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/erts/include/internal/gcc/ethr_atomic.h b/erts/include/internal/gcc/ethr_atomic.h index 775030c8d5..e8e529dd48 100644 --- a/erts/include/internal/gcc/ethr_atomic.h +++ b/erts/include/internal/gcc/ethr_atomic.h @@ -31,7 +31,7 @@ #define ETHR_IMMED_ATOMIC_SET_GET_SAFE__ 0 /* Enable immediate read/write on platforms where we know it is safe */ #if defined(__i386__) || defined(__x86_64__) || defined(__sparc__) \ - || defined(__powerpc__) || defined(__ppc__) + || defined(__powerpc__) || defined(__ppc__) || defined(__mips__) # undef ETHR_IMMED_ATOMIC_SET_GET_SAFE__ # define ETHR_IMMED_ATOMIC_SET_GET_SAFE__ 1 #endif @@ -48,13 +48,19 @@ typedef struct { * a noop on at least some platforms with some gcc versions. * This has suposedly been fixed in some gcc version, but we * don't know from which version. Therefore, we use the - * workaround implemented below on all gcc versions. + * workaround implemented below on all gcc versions except + * for gcc 4.2 or above for MIPS, where it's been verified. */ +#if defined(__mips__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)) +#define ETHR_MEMORY_BARRIER __sync_synchronize() +#else #define ETHR_MEMORY_BARRIER \ do { \ volatile long x___ = 0; \ (void) __sync_val_compare_and_swap(&x___, (long) 0, (long) 1); \ } while (0) +#endif +#define ETHR_READ_DEPEND_MEMORY_BARRIER ETHR_MEMORY_BARRIER #if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_AUX_IMPL__) @@ -157,6 +163,24 @@ ethr_native_atomic_xchg(ethr_native_atomic_t *var, long new) return act; } +/* + * Atomic ops with at least specified barriers. + */ + +static ETHR_INLINE long +ethr_native_atomic_read_acqb(ethr_native_atomic_t *var) +{ + return __sync_add_and_fetch(&var->counter, (long) 0); +} + +#define ethr_native_atomic_inc_return_acqb ethr_native_atomic_inc_return +#define ethr_native_atomic_set_relb ethr_native_atomic_xchg +#define ethr_native_atomic_dec_relb ethr_native_atomic_dec_return +#define ethr_native_atomic_dec_return_relb ethr_native_atomic_dec_return + +#define ethr_native_atomic_cmpxchg_acqb ethr_native_atomic_cmpxchg +#define ethr_native_atomic_cmpxchg_relb ethr_native_atomic_cmpxchg + #endif #endif |