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mariadb/include/atomic/x86-gcc.h
unknown ea57b3d4a0 Merge gbichot3.local:/home/mysql_src/mysql-5.1-for-maria 
into  gbichot3.local:/home/mysql_src/mysql-maria


BitKeeper/etc/ignore:
  auto-union
BUILD/SETUP.sh:
  Auto merged
client/mysqldump.c:
  Auto merged
config/ac-macros/plugins.m4:
  Auto merged
configure.in:
  Auto merged
include/Makefile.am:
  Auto merged
include/atomic/nolock.h:
  Auto merged
include/atomic/rwlock.h:
  Auto merged
include/atomic/x86-gcc.h:
  Auto merged
include/atomic/x86-msvc.h:
  Auto merged
include/ft_global.h:
  Auto merged
include/keycache.h:
  Auto merged
include/m_string.h:
  Auto merged
include/my_atomic.h:
  Auto merged
include/my_base.h:
  Auto merged
include/my_dbug.h:
  Auto merged
include/my_global.h:
  Auto merged
include/my_handler.h:
  Auto merged
include/my_sys.h:
  Auto merged
include/myisam.h:
  Auto merged
libmysql/CMakeLists.txt:
  Auto merged
libmysqld/Makefile.am:
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mysql-test/mysql-test-run.pl:
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mysql-test/r/events_logs_tests.result:
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mysql-test/t/events_logs_tests.test:
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mysys/Makefile.am:
  Auto merged
mysys/array.c:
  Auto merged
mysys/mf_keycache.c:
  Auto merged
mysys/mf_keycaches.c:
  Auto merged
mysys/my_atomic.c:
  Auto merged
mysys/my_bit.c:
  Auto merged
mysys/my_bitmap.c:
  Auto merged
mysys/my_create.c:
  Auto merged
mysys/my_delete.c:
  Auto merged
mysys/my_getsystime.c:
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mysys/my_handler.c:
  Auto merged
mysys/my_init.c:
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mysys/my_open.c:
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mysys/my_pread.c:
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mysys/my_rename.c:
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mysys/my_symlink.c:
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mysys/my_sync.c:
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plugin/daemon_example/daemon_example.cc:
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sql/Makefile.am:
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sql/filesort.cc:
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sql/gen_lex_hash.cc:
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sql/ha_ndbcluster.cc:
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sql/handler.h:
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sql/item_func.cc:
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sql/item_func.h:
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sql/log.cc:
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sql/mysql_priv.h:
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sql/set_var.h:
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sql/sql_class.h:
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sql/sql_parse.cc:
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sql/sql_select.cc:
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sql/sql_sort.h:
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sql/sql_test.cc:
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sql/uniques.cc:
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sql/unireg.cc:
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storage/Makefile.am:
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storage/csv/ha_tina.cc:
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storage/myisam/Makefile.am:
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storage/myisam/ft_boolean_search.c:
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storage/myisam/ft_nlq_search.c:
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storage/myisam/ft_parser.c:
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storage/myisam/ft_static.c:
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storage/myisam/ft_stopwords.c:
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storage/myisam/ft_update.c:
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storage/myisam/fulltext.h:
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storage/myisam/ha_myisam.h:
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storage/myisam/mi_check.c:
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storage/myisam/mi_create.c:
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storage/myisam/mi_delete.c:
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storage/myisam/mi_delete_all.c:
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storage/myisam/mi_dynrec.c:
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storage/myisam/mi_key.c:
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storage/myisam/mi_log.c:
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storage/myisam/mi_open.c:
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storage/myisam/mi_packrec.c:
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storage/myisam/mi_range.c:
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storage/myisam/mi_rsamepos.c:
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storage/myisam/mi_search.c:
  Auto merged
storage/myisam/mi_test1.c:
  Auto merged
storage/myisam/mi_test2.c:
  Auto merged
storage/myisam/mi_unique.c:
  Auto merged
storage/myisam/mi_update.c:
  Auto merged
storage/myisam/mi_write.c:
  Auto merged
storage/myisam/myisamchk.c:
  Auto merged
storage/myisam/myisamlog.c:
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storage/myisam/myisampack.c:
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storage/myisam/rt_index.c:
  Auto merged
storage/myisam/sort.c:
  Auto merged
storage/myisammrg/ha_myisammrg.h:
  Auto merged
unittest/mytap/tap.c:
  Auto merged
mysql-test/r/view.result:
  manual merge
mysql-test/t/view.test:
  manual merge
Makefile.am:
  manual merge
mysql-test/t/disabled.def:
  manual merge
sql/mysqld.cc:
  manual merge
sql/set_var.cc:
  manual merge
sql/udf_example.c:
  manual merge
storage/myisam/ha_myisam.cc:
  manual merge
storage/myisam/myisamdef.h:
  manual merge
storage/ndb/src/mgmapi/mgmapi.cpp:
  manual merge
unittest/Makefile.am:
  manual merge
unittest/mysys/Makefile.am:
  manual merge
unittest/mysys/my_atomic-t.c:
  manual merge
2007-02-28 17:50:51 +01:00

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/* Copyright (C) 2006 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 */
/*
XXX 64-bit atomic operations can be implemented using
cmpxchg8b, if necessary. Though I've heard that not all 64-bit
architectures support double-word (128-bit) cas.
*/
#ifdef __x86_64__
# ifdef MY_ATOMIC_NO_XADD
# define MY_ATOMIC_MODE "gcc-amd64" LOCK_prefix "-no-xadd"
# else
# define MY_ATOMIC_MODE "gcc-amd64" LOCK_prefix
# endif
#else
# ifdef MY_ATOMIC_NO_XADD
# define MY_ATOMIC_MODE "gcc-x86" LOCK_prefix "-no-xadd"
# else
# define MY_ATOMIC_MODE "gcc-x86" LOCK_prefix
# endif
#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_prefix "; xadd %0, %1;" : "+r" (v) , "+m" (*a))
#endif
#define make_atomic_fas_body(S) \
asm volatile ("xchg %0, %1;" : "+r" (v) , "+m" (*a))
#define make_atomic_cas_body(S) \
asm volatile (LOCK_prefix "; cmpxchg %3, %0; setz %2;" \
: "+m" (*a), "+a" (*cmp), "=q" (ret): "r" (set))
#ifdef MY_ATOMIC_MODE_DUMMY
#define make_atomic_load_body(S) ret=*a
#define make_atomic_store_body(S) *a=v
#else
/*
Actually 32-bit reads/writes are always atomic on x86
But we add LOCK_prefix here anyway to force memory barriers
*/
#define make_atomic_load_body(S) \
ret=0; \
asm volatile (LOCK_prefix "; cmpxchg %2, %0" \
: "+m" (*a), "+a" (ret): "r" (ret))
#define make_atomic_store_body(S) \
asm volatile ("; xchg %0, %1;" : "+m" (*a), "+r" (v))
#endif
/* TODO test on intel whether the below helps. on AMD it makes no difference */
//#define LF_BACKOFF ({asm volatile ("rep; nop"); 1; })
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