diff options
Diffstat (limited to 'include/atomic.h')
| -rw-r--r-- | include/atomic.h | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/include/atomic.h b/include/atomic.h index 7f326400c3..d002b117bf 100644 --- a/include/atomic.h +++ b/include/atomic.h @@ -54,7 +54,7 @@ and following args. */ #define __atomic_val_bysize(pre, post, mem, ...) \ ({ \ - __typeof (*mem) __atg1_result; \ + __typeof ((__typeof (*(mem))) *(mem)) __atg1_result; \ if (sizeof (*mem) == 1) \ __atg1_result = pre##_8_##post (mem, __VA_ARGS__); \ else if (sizeof (*mem) == 2) \ @@ -162,9 +162,9 @@ /* Store NEWVALUE in *MEM and return the old value. */ #ifndef atomic_exchange_acq # define atomic_exchange_acq(mem, newvalue) \ - ({ __typeof (*(mem)) __atg5_oldval; \ + ({ __typeof ((__typeof (*(mem))) *(mem)) __atg5_oldval; \ __typeof (mem) __atg5_memp = (mem); \ - __typeof (*(mem)) __atg5_value = (newvalue); \ + __typeof ((__typeof (*(mem))) *(mem)) __atg5_value = (newvalue); \ \ do \ __atg5_oldval = *__atg5_memp; \ @@ -668,7 +668,7 @@ void __atomic_link_error (void); # ifndef atomic_load_relaxed # define atomic_load_relaxed(mem) \ - ({ __typeof (*(mem)) __atg100_val; \ + ({ __typeof ((__typeof (*(mem))) *(mem)) __atg100_val; \ __asm ("" : "=r" (__atg100_val) : "0" (*(mem))); \ __atg100_val; }) # endif @@ -818,4 +818,12 @@ void __atomic_link_error (void); # define atomic_spin_nop() do { /* nothing */ } while (0) #endif +/* ATOMIC_EXCHANGE_USES_CAS is non-zero if atomic_exchange operations + are implemented based on a CAS loop; otherwise, this is zero and we assume + that the atomic_exchange operations could provide better performance + than a CAS loop. */ +#ifndef ATOMIC_EXCHANGE_USES_CAS +# error ATOMIC_EXCHANGE_USES_CAS has to be defined. +#endif + #endif /* atomic.h */ |