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/*
Copyright (C) 2004-2006 Grame
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __JackAtomic__
#define __JackAtomic__
typedef unsigned short UInt16;
typedef unsigned long UInt32;
typedef long SInt32;
#ifdef WIN32
#include <windows.h>
typedef ULONGLONG UInt64;
#else
typedef unsigned long long UInt64;
#endif
#if defined(__APPLE__)
#if defined(__ppc__)
static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr)
{
register int result;
asm volatile (
"# CAS \n"
" lwarx r0, 0, %1 \n" // creates a reservation on addr
" cmpw r0, %2 \n" // test value at addr
" bne- 1f \n"
" sync \n" // synchronize instructions
" stwcx. %3, 0, %1 \n" // if the reservation is not altered
// stores the new value at addr
" bne- 1f \n"
" li %0, 1 \n"
" b 2f \n"
"1: \n"
" li %0, 0 \n"
"2: \n"
: "=r" (result)
: "r" (addr), "r" (value), "r" (newvalue)
: "r0"
);
return result;
}
#endif
#if defined(__i386__) || defined(__x86_64__)
#ifdef __SMP__
# define LOCK "lock ; "
#else
# define LOCK ""
#endif
static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr)
{
register char ret;
__asm__ __volatile__ (
"# CAS \n\t"
LOCK "cmpxchg %2, (%1) \n\t"
"sete %0 \n\t"
: "=a" (ret)
: "c" (addr), "d" (newvalue), "a" (value)
);
return ret;
}
#endif
#endif
#ifdef __linux__
#ifdef __PPC__
static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr)
{
register int result;
register UInt32 tmp;
asm volatile (
"# CAS \n"
" lwarx %4, 0, %1 \n" // creates a reservation on addr
" cmpw %4, %2 \n" // test value at addr
" bne- 1f \n"
" sync \n" // synchronize instructions
" stwcx. %3, 0, %1 \n" // if the reservation is not altered
// stores the new value at addr
" bne- 1f \n"
" li %0, 1 \n"
" b 2f \n"
"1: \n"
" li %0, 0 \n"
"2: \n"
: "=r" (result)
: "r" (addr), "r" (value), "r" (newvalue), "r" (tmp)
);
return result;
}
#endif
#if defined(__i386__) || defined(__x86_64__)
#ifdef __SMP__
# define LOCK "lock ; "
#else
# define LOCK ""
#endif
static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr)
{
register char ret;
__asm__ __volatile__ (
"# CAS \n\t"
LOCK "cmpxchg %2, (%1) \n\t"
"sete %0 \n\t"
: "=a" (ret)
: "c" (addr), "d" (newvalue), "a" (value)
);
return ret;
}
#endif
#endif
#ifdef WIN32
#ifdef __SMP__
# define LOCK lock
#else
# define LOCK
#endif
#define inline __inline
//----------------------------------------------------------------
// CAS functions
//----------------------------------------------------------------
inline char CAS (volatile UInt32 value, UInt32 newvalue, volatile void * addr)
{
register char c;
__asm {
push ebx
push esi
mov esi, addr
mov eax, value
mov ebx, newvalue
LOCK cmpxchg dword ptr [esi], ebx
sete c
pop esi
pop ebx
}
return c;
}
#endif
static inline long INC_ATOMIC(volatile SInt32* val)
{
SInt32 actual;
do {
actual = *val;
} while (!CAS(actual, actual + 1, val));
return actual;
}
static inline long DEC_ATOMIC(volatile SInt32* val)
{
SInt32 actual;
do {
actual = *val;
} while (!CAS(actual, actual - 1, val));
return actual;
}
#endif
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