Performance patch: Mysql atomic patch

configure.in

@@ -1753,6 +1753,32 @@ if test "x$mysql_cv_gcc_atomic_builtins" = xyes; then
             [Define to 1 if compiler provides atomic builtins.])
 fi
 
+AC_CACHE_CHECK([whether the OS provides atomic_* functions like Solaris],
+               [mysql_cv_solaris_atomic], [AC_TRY_RUN([
+#include <atomic.h>
+int
+main()
+{
+	int foo = -10; int bar = 10;
+	if (atomic_add_int_nv((uint_t *)&foo, bar) || foo)
+		return -1;
+	bar = atomic_swap_uint((uint_t *)&foo, (uint_t)bar);
+	if (bar || foo != 10)
+		return -1;
+	bar = atomic_cas_uint((uint_t *)&bar, (uint_t)foo, 15);
+	if (bar)
+		return -1;
+	return 0;
+}
+], [mysql_cv_solaris_atomic=yes],
+   [mysql_cv_solaris_atomic=no],
+   [mysql_cv_solaris_atomic=no])])
+
+if test "x$mysql_cv_solaris_atomic" = xyes; then
+  AC_DEFINE(HAVE_SOLARIS_ATOMIC, 1,
+            [Define to 1 if OS provides atomic_* functions like Solaris.])
+fi
+
 # Force static compilation to avoid linking problems/get more speed
 AC_ARG_WITH(mysqld-ldflags,
     [  --with-mysqld-ldflags   Extra linking arguments for mysqld],

include/atomic/nolock.h

@@ -28,11 +28,28 @@
 #elif defined(_MSC_VER)
 #include "x86-msvc.h"
 #endif
-#endif
 
-#ifdef make_atomic_cas_body
+#elif defined(HAVE_SOLARIS_ATOMIC)
+
+#include "solaris.h"
+
+#endif /* __i386__ || _M_IX86 || HAVE_GCC_ATOMIC_BUILTINS */
+
+#if defined(make_atomic_cas_body) || defined(MY_ATOMICS_MADE)
+/*
+ * We have atomics that require no locking
+ */
+#define	MY_ATOMIC_NOLOCK
 
+#ifdef __SUNPRO_C
+/*
+ * Sun Studio 12 (and likely earlier) does not accept a typedef struct {}
+ */
+typedef char my_atomic_rwlock_t;
+#else
 typedef struct { } my_atomic_rwlock_t;
+#endif
+
 #define my_atomic_rwlock_destroy(name)
 #define my_atomic_rwlock_init(name)
 #define my_atomic_rwlock_rdlock(name)

include/my_atomic.h

@@ -18,13 +18,21 @@
 #define intptr         void *
 
 #ifndef MY_ATOMIC_MODE_RWLOCKS
+/*
+ * Attempt to do atomic ops without locks
+ */
 #include "atomic/nolock.h"
 #endif
 
-#ifndef make_atomic_cas_body
+#ifndef MY_ATOMIC_NOLOCK
+/*
+ * Have to use rw-locks for atomic ops
+ */
 #include "atomic/rwlock.h"
 #endif
 
+#ifndef MY_ATOMICS_MADE
+
 #ifndef make_atomic_add_body
 #define make_atomic_add_body(S)					\
   int ## S tmp=*a;                                              \
@@ -91,7 +99,7 @@ extern int ## S my_atomic_load ## S(int ## S volatile *a);
 #define make_atomic_store(S)					\
 extern void my_atomic_store ## S(int ## S volatile *a, int ## S v);
 
-#endif
+#endif /* HAVE_INLINE */
 
 make_atomic_cas( 8)
 make_atomic_cas(16)
@@ -129,6 +137,8 @@ make_atomic_swap(ptr)
 #undef make_atomic_swap_body
 #undef intptr
 
+#endif /* MY_ATOMICS_MADE */
+
 #ifdef _atomic_h_cleanup_
 #include _atomic_h_cleanup_
 #undef _atomic_h_cleanup_