diff options
| -rw-r--r-- | ext/etc/etc.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/ext/etc/etc.c b/ext/etc/etc.c index 44273ff9ad..50f566d10f 100644 --- a/ext/etc/etc.c +++ b/ext/etc/etc.c @@ -68,6 +68,15 @@ void rb_deprecate_constant(VALUE mod, const char *name); typedef int rb_atomic_t; # define RUBY_ATOMIC_CAS(var, oldval, newval) \ ((var) == (oldval) ? ((var) = (newval), (oldval)) : (var)) +# define RUBY_ATOMIC_EXCHANGE(var, newval) \ + atomic_exchange(&var, newval) +static inline rb_atomic_t +atomic_exchange(volatile rb_atomic_t *var, rb_atomic_t newval) +{ + rb_atomic_t oldval = *var; + *var = newval; + return oldval; +} #endif /* call-seq: |