Add SGEN_ATOMIC_ADD_P for pointer sized integers.

diff --git a/mono/metadata/sgen-gc.h b/mono/metadata/sgen-gc.h
index afe122364dab7042f1b4d7c2c832d600af2834b9..550f03fcd3a4c5766895dfbf920bb6518c5d2338 100644 (file)
--- a/mono/metadata/sgen-gc.h
+++ b/mono/metadata/sgen-gc.h
@@ -208,6 +208,7 @@ typedef struct _SgenPinnedChunk SgenPinnedChunk;
 #define LOCK_INTERRUPTION mono_mutex_lock (&interruption_mutex)
 #define UNLOCK_INTERRUPTION mono_mutex_unlock (&interruption_mutex)
 
+/* FIXME: Use InterlockedAdd & InterlockedAdd64 to reduce the CAS cost. */
 #define SGEN_CAS_PTR   InterlockedCompareExchangePointer
 #define SGEN_ATOMIC_ADD(x,i)   do {                                    \
                int __old_x;                                            \
@@ -215,6 +216,13 @@ typedef struct _SgenPinnedChunk SgenPinnedChunk;
                        __old_x = (x);                                  \
                } while (InterlockedCompareExchange (&(x), __old_x + (i), __old_x) != __old_x); \
        } while (0)
+#define SGEN_ATOMIC_ADD_P(x,i) do { \
+               size_t __old_x;                                            \
+               do {                                                    \
+                       __old_x = (x);                                  \
+               } while (InterlockedCompareExchangePointer ((void**)&(x), (void*)(__old_x + (i)), (void*)__old_x) != (void*)__old_x); \
+       } while (0)
+
 
 #ifndef HOST_WIN32
 /* we intercept pthread_create calls to know which threads exist */