move atomic logic from mjit.c from ruby_atomic.h

This macro shall be shared among other files, not just for mjit.c.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64156 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

mjit.c

@@ -140,15 +140,7 @@ typedef intptr_t pid_t;
 #endif
 
 /* Atomically set function pointer if possible. */
-#ifdef _WIN32
-# ifdef InterlockedExchangePointer
-#  define MJIT_ATOMIC_SET(var, val) InterlockedExchangePointer((void **)&(var), (void *)val)
-# else
-#  define MJIT_ATOMIC_SET(var, val) (void)((var) = (val))
-# endif
-#else
-# define MJIT_ATOMIC_SET(var, val) ATOMIC_SET(var, val)
-#endif
+#define MJIT_ATOMIC_SET(var, val) ATOMIC_PTR_EXCHANGE(var, val)
 
 /* A copy of MJIT portion of MRI options since MJIT initialization.  We
    need them as MJIT threads still can work when the most MRI data were

ruby_atomic.h

@@ -90,6 +90,10 @@ rb_w32_atomic_cas(volatile rb_atomic_t *var, rb_atomic_t oldval, rb_atomic_t new
 #  define ATOMIC_SIZE_EXCHANGE(var, val) InterlockedExchange((LONG *)&(var), (val))
 # endif
 
+# ifdef InterlockedExchangePointer
+#   define ATOMIC_PTR_EXCHANGE(var, val) InterlockedExchangePointer((PVOID volatile *)&(var), (PVOID)(val))
+# endif /* See below for definitions of other situations */
+
 #elif defined(__sun) && defined(HAVE_ATOMIC_H)
 #include <atomic.h>
 typedef unsigned int rb_atomic_t;