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