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Bug#33728 Atomic builtins

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Use compiler provided atomic builtins as a 'backend' for
MySQL's atomic primitives. The builtins are available on
a handful of platforms and compilers.


configure.in:
  Check if the compiler provides atomic builtins and
  that __sync_lock_test_and_set stores the correct value.
include/atomic/nolock.h:
  Use the atomic builtins if available.
include/atomic/gcc_builtins.h:
  Implement the atomic ADD, SWAP, CAS, STORE (or operation
  optimized away) and LOAD primitives using atomic builtins
  provided by the compiler.
This commit is contained in:
unknown 2008-01-11 20:34:36 -02:00
parent 44101143f7
commit 26af3c7e35
3 changed files with 61 additions and 2 deletions
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24
configure.in
View file

@ -1688,6 +1688,30 @@ case "$with_atomic_ops" in
*) AC_MSG_ERROR(["$with_atomic_ops" is not a valid value for --with-atomic-ops]) ;;
esac
AC_CACHE_CHECK([whether the compiler provides atomic builtins],
[mysql_cv_gcc_atomic_builtins], [AC_TRY_RUN([
int main()
{
int foo= -10; int bar= 10;
if (!__sync_fetch_and_add(&foo, bar) || foo)
return -1;
bar= __sync_lock_test_and_set(&foo, bar);
if (bar || foo != 10)
return -1;
bar= __sync_val_compare_and_swap(&bar, foo, 15);
if (bar)
return -1;
return 0;
}
], [mysql_cv_gcc_atomic_builtins=yes],
[mysql_cv_gcc_atomic_builtins=no],
[mysql_cv_gcc_atomic_builtins=no])])
if test "x$mysql_cv_gcc_atomic_builtins" = xyes; then
AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS, 1,
[Define to 1 if compiler provides atomic builtins.])
fi
# Force static compilation to avoid linking problems/get more speed
AC_ARG_WITH(mysqld-ldflags,
[ --with-mysqld-ldflags Extra linking arguments for mysqld],

33
include/atomic/gcc_builtins.h Normal file
View file

@ -0,0 +1,33 @@
/* Copyright (C) 2008 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#define make_atomic_add_body(S) \
v= __sync_fetch_and_add(a, v);
#define make_atomic_swap_body(S) \
v= __sync_lock_test_and_set(a, v);
#define make_atomic_cas_body(S) \
int ## S sav; \
sav= __sync_val_compare_and_swap(a, *cmp, set); \
if (!(ret= (sav == *cmp))) *cmp= sav;
#ifdef MY_ATOMIC_MODE_DUMMY
#define make_atomic_load_body(S) ret= *a
#define make_atomic_store_body(S) *a= v
#else
#define make_atomic_load_body(S) \
ret= __sync_fetch_and_or(a, 0);
#define make_atomic_store_body(S) \
(void) __sync_lock_test_and_set(a, v);
#endif

6
include/atomic/nolock.h
View file

@ -13,7 +13,7 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#if defined(__i386__) || defined(_M_IX86)
#if defined(__i386__) || defined(_M_IX86) || defined(HAVE_GCC_ATOMIC_BUILTINS)
#ifdef MY_ATOMIC_MODE_DUMMY
# define LOCK ""
@ -21,7 +21,9 @@
# define LOCK "lock"
#endif
#ifdef __GNUC__
#ifdef HAVE_GCC_ATOMIC_BUILTINS
#include "gcc_builtins.h"
#elif __GNUC__
#include "x86-gcc.h"
#elif defined(_MSC_VER)
#include "x86-msvc.h"