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85 lines
3 KiB
C
85 lines
3 KiB
C
/* Copyright (C) 2006 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; either version 2 of the License, or
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(at your option) any later version.
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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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/*
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XXX 64-bit atomic operations can be implemented using
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cmpxchg8b, if necessary
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*/
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// Would it be better to use intrinsics ?
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// (InterlockedCompareExchange, InterlockedCompareExchange16
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// InterlockedExchangeAdd, InterlockedExchange)
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#define make_atomic_add_body(REG) \
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_asm { \
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_asm mov REG, v \
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_asm LOCK xadd a->val, REG \
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_asm movzx v, REG \
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}
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#define make_atomic_cas_body(AREG,REG2) \
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_asm { \
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_asm mov AREG, *cmp \
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_asm mov REG2, set \
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_asm LOCK cmpxchg a->val, REG2 \
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_asm mov *cmp, AREG \
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_asm setz al \
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_asm movzx ret, al \
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}
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#define make_atomic_swap_body(REG) \
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_asm { \
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_asm mov REG, v \
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_asm xchg a->val, REG \
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_asm mov v, REG \
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}
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#ifdef MY_ATOMIC_MODE_DUMMY
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#define make_atomic_load_body(AREG,REG) ret=a->val
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#define make_atomic_store_body(REG) a->val=v
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#else
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/*
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Actually 32-bit reads/writes are always atomic on x86
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But we add LOCK here anyway to force memory barriers
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*/
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#define make_atomic_load_body(AREG,REG2) \
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_asm { \
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_asm mov AREG, 0 \
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_asm mov REG2, AREG \
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_asm LOCK cmpxchg a->val, REG2 \
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_asm mov ret, AREG \
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}
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#define make_atomic_store_body(REG) \
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_asm { \
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_asm mov REG, v \
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_asm xchg a->val, REG \
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}
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#endif
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#define make_atomic_add_body8 make_atomic_add_body(al)
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#define make_atomic_add_body16 make_atomic_add_body(ax)
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#define make_atomic_add_body32 make_atomic_add_body(eax)
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#define make_atomic_cas_body8 make_atomic_cas_body(al, bl)
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#define make_atomic_cas_body16 make_atomic_cas_body(ax, bx)
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#define make_atomic_cas_body32 make_atomic_cas_body(eax, ebx)
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#define make_atomic_load_body8 make_atomic_load_body(al, bl)
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#define make_atomic_load_body16 make_atomic_load_body(ax, bx)
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#define make_atomic_load_body32 make_atomic_load_body(eax, ebx)
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#define make_atomic_store_body8 make_atomic_store_body(al)
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#define make_atomic_store_body16 make_atomic_store_body(ax)
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#define make_atomic_store_body32 make_atomic_store_body(eax)
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#define make_atomic_swap_body8 make_atomic_swap_body(al)
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#define make_atomic_swap_body16 make_atomic_swap_body(ax)
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#define make_atomic_swap_body32 make_atomic_swap_body(eax)
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