return vlc_atomic_sub (atom, 1);
}
+VLC_EXPORT(uintptr_t, vlc_atomic_swap, (vlc_atomic_t *, uintptr_t));
+VLC_EXPORT(uintptr_t, vlc_atomic_compare_swap, (vlc_atomic_t *, uintptr_t, uintptr_t));
+
#endif
return __sync_add_and_fetch (&atom->u, v);
}
+uintptr_t vlc_atomic_swap (vlc_atomic_t *atom, uintptr_t v)
+{
+ /* grmbl, gcc does not provide an intrinsic for this! */
+ uintptr_t u;
+
+ do
+ u = vlc_atomic_get (atom);
+ while (vlc_atomic_compare_swap (atom, u, v) != u);
+
+ return u;
+}
+
+uintptr_t vlc_atomic_compare_swap (vlc_atomic_t *atom,
+ uintptr_t oldval, uintptr_t newval)
+{
+ return __sync_val_compare_and_swap (&atom->u, oldval, newval);
+}
+
#else
/* Worst-case fallback implementation with a mutex */
return v;
}
+uintptr_t vlc_atomic_swap (vlc_atomic_t *atom, uintptr_t v)
+{
+ uintptr_t u;
+
+ vlc_mutex_lock (&lock);
+ u = atom->u;
+ atom->u = v;
+ vlc_mutex_unlock (&lock);
+
+ return u;
+}
+
+uintptr_t vlc_atomic_compare_and_swap (vlc_atomic_t *atom,
+ uintptr_t oldval, uintptr_t newval)
+{
+ uintptr_t u;
+
+ vlc_mutex_lock (&lock);
+ u = atom->u;
+ if (u == oldval)
+ atom->u = newval;
+ vlc_mutex_unlock (&lock);
+
+ return u;
+}
+
#endif
return InterlockedExchangeAdd (&atom->s, v) + v;
#endif
}
+
+uintptr_t vlc_atomic_swap (vlc_atomic_t *atom, uintptr_t v)
+{
+#if defined (WIN64)
+ return InterlockedExchange64 (&atom->s, v);
+#else
+ return InterlockedExchange (&atom->s, v);
+#endif
+}
+
+uintptr_t vlc_atomic_compare_swap (vlc_atomic_t *atom,
+ uintptr_t oldval, uintptr_t newval)
+{
+#if defined (WIN64)
+ return InterlockedCompareExchange64 (&atom->s, newval, oldval);
+#else
+ return InterlockedCompareExchange (&atom->s, newval, oldval);
+#endif
+}