support for xadd emulation, workaround for Darwin

include/atomic/nolock.h

@@ -15,11 +15,13 @@
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
 #if defined(__i386__) || defined(_M_IX86)
+
 #ifdef MY_ATOMIC_MODE_DUMMY
 #  define LOCK ""
 #else
-#  define LOCK "lock "
+#  define LOCK "lock"
 #endif
+
 #ifdef __GNUC__
 #include "x86-gcc.h"
 #elif defined(_MSC_VER)
@@ -27,7 +29,7 @@
 #endif
 #endif
 
-#ifdef make_atomic_add_body
+#ifdef make_atomic_cas_body
 
 typedef struct { } my_atomic_rwlock_t;
 #define my_atomic_rwlock_destroy(name)

include/atomic/x86-gcc.h

@@ -20,19 +20,25 @@
   architectures support double-word (128-bit) cas.
 */
 
-#define MY_ATOMIC_MODE "gcc-x86" ## LOCK
+#ifdef MY_ATOMIC_NO_XADD
+#define MY_ATOMIC_MODE "gcc-x86" LOCK "-no-xadd"
+#else
+#define MY_ATOMIC_MODE "gcc-x86" LOCK
+#endif
 
 /* fix -ansi errors while maintaining readability */
 #ifndef asm
 #define asm __asm__
 #endif
 
+#ifndef MY_ATOMIC_NO_XADD
 #define make_atomic_add_body(S)					\
-  asm volatile (LOCK "xadd %0, %1;" : "+r" (v) , "+m" (*a))
+  asm volatile (LOCK "; xadd %0, %1;" : "+r" (v) , "+m" (*a))
+#endif
 #define make_atomic_swap_body(S)				\
-  asm volatile ("xchg %0, %1;" : "+r" (v) , "+m" (*a))
+  asm volatile ("; xchg %0, %1;" : "+r" (v) , "+m" (*a))
 #define make_atomic_cas_body(S)					\
-  asm volatile (LOCK "cmpxchg %3, %0; setz %2;"			\
+  asm volatile (LOCK "; cmpxchg %3, %0; setz %2;"		\
                : "+m" (*a), "+a" (*cmp), "=q" (ret): "r" (set))
 
 #ifdef MY_ATOMIC_MODE_DUMMY
@@ -45,9 +51,9 @@
 */
 #define make_atomic_load_body(S)				\
   ret=0;							\
-  asm volatile (LOCK "cmpxchg %2, %0"				\
+  asm volatile (LOCK "; cmpxchg %2, %0"				\
                : "+m" (*a), "+a" (ret): "r" (ret))
 #define make_atomic_store_body(S)				\
-  asm volatile ("xchg %0, %1;" : "+m" (*a) : "r" (v))
+  asm volatile ("; xchg %0, %1;" : "+m" (*a) : "r" (v))
 #endif
 

include/atomic/x86-msvc.h

@@ -26,7 +26,7 @@
 #ifndef _atomic_h_cleanup_
 #define _atomic_h_cleanup_ "atomic/x86-msvc.h"
 
-#define MY_ATOMIC_MODE "msvc-x86" ## LOCK
+#define MY_ATOMIC_MODE "msvc-x86" LOCK
 
 #define make_atomic_add_body(S)				\
   _asm {						\

include/my_atomic.h

@@ -22,10 +22,17 @@
 #include "atomic/nolock.h"
 #endif
 
-#ifndef my_atomic_rwlock_init
+#ifndef make_atomic_cas_body
 #include "atomic/rwlock.h"
 #endif
 
+#ifndef make_atomic_add_body
+#define make_atomic_add_body(S)					\
+  int ## S tmp=*a;                                              \
+  while (!my_atomic_cas ## S(a, &tmp, tmp+v));                  \
+  v=tmp;
+#endif
+
 #ifdef HAVE_INLINE
 
 #define make_atomic_add(S)					\
@@ -87,15 +94,15 @@ extern void my_atomic_store ## S(int ## S volatile *a, int ## S v);
 
 #endif
 
-make_atomic_add( 8)
-make_atomic_add(16)
-make_atomic_add(32)
-
 make_atomic_cas( 8)
 make_atomic_cas(16)
 make_atomic_cas(32)
 make_atomic_cas(ptr)
 
+make_atomic_add( 8)
+make_atomic_add(16)
+make_atomic_add(32)
+
 make_atomic_load( 8)
 make_atomic_load(16)
 make_atomic_load(32)
@@ -116,13 +123,20 @@ make_atomic_swap(ptr)
 #undef make_atomic_load
 #undef make_atomic_store
 #undef make_atomic_swap
-#undef intaptr
+#undef make_atomic_add_body
+#undef make_atomic_cas_body
+#undef make_atomic_load_body
+#undef make_atomic_store_body
+#undef make_atomic_swap_body
+#undef intptr
 
 #ifdef _atomic_h_cleanup_
 #include _atomic_h_cleanup_
 #undef _atomic_h_cleanup_
 #endif
 
+typedef int32 intptr; /* TODO configure check */
+
 #define MY_ATOMIC_OK       0
 #define MY_ATOMIC_NOT_1CPU 1
 extern int my_atomic_initialize();

mysys/my_atomic.c

@@ -36,6 +36,7 @@
 */
 int my_atomic_initialize()
 {
+  DBUG_ASSERT(sizeof(intptr) == sizeof(void *));
   /* currently the only thing worth checking is SMP/UP issue */
 #ifdef MY_ATOMIC_MODE_DUMMY
   return my_getncpus() == 1 ? MY_ATOMIC_OK : MY_ATOMIC_NOT_1CPU;