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