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[ruby/etc] Added fallback definition of RUBY_ATOMIC_EXCHANGE

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https://github.com/ruby/etc/commit/0c5900bd21
This commit is contained in:
Nobuyoshi Nakada 2021-01-11 11:31:52 +09:00
parent f6e2c41db3
commit d2aaf865e3
1 changed files with 9 additions and 0 deletions
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9
ext/etc/etc.c
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@ -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: