diff options
| author | unknown <davi@mysql.com/endora.local> | 2008-01-11 20:34:36 -0200 |
|---|---|---|
| committer | unknown <davi@mysql.com/endora.local> | 2008-01-11 20:34:36 -0200 |
| commit | 26af3c7e351483496db87ba08394cad4ae034a95 (patch) | |
| tree | 115e267d95776235581c61a21bf888c7e7690075 /include/atomic | |
| parent | 44101143f7668cc753f9f78057f164469b051760 (diff) | |
| download | mariadb-git-26af3c7e351483496db87ba08394cad4ae034a95.tar.gz | |
Bug#33728 Atomic builtins
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.
Diffstat (limited to 'include/atomic')
| -rw-r--r-- | include/atomic/gcc_builtins.h | 33 | ||||
| -rw-r--r-- | include/atomic/nolock.h | 6 |
2 files changed, 37 insertions, 2 deletions
diff --git a/include/atomic/gcc_builtins.h b/include/atomic/gcc_builtins.h new file mode 100644 index 00000000000..509701b30a5 --- /dev/null +++ b/include/atomic/gcc_builtins.h @@ -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 diff --git a/include/atomic/nolock.h b/include/atomic/nolock.h index f15c8b13b7f..10ac17884b6 100644 --- a/include/atomic/nolock.h +++ b/include/atomic/nolock.h @@ -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" |