9813625ad7
git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@92 315a16e6-25f9-4109-90ae-ca3045a26c18
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
|
|
* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
|
|
* RWTH Aachen University
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* This file is part of MetalSVM.
|
|
*/
|
|
|
|
#ifndef __ARCH_ATOMIC_H__
|
|
#define __ARCH_ATOMIC_H__
|
|
|
|
#include <metalsvm/stddef.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#if MAX_CORES > 1
|
|
#define LOCK "lock ; "
|
|
#else
|
|
#define LOCK ""
|
|
#endif
|
|
|
|
#define ATOMIC_INIT(i) { (i) }
|
|
|
|
typedef struct { volatile int32_t counter; } atomic_int32_t;
|
|
|
|
/*
|
|
* Intel manuals: If a memory operand is referenced, the processor's locking
|
|
* protocol is automatically implemented for the duration of the exchange
|
|
* operation, regardless of the presence or absence of the LOCK prefix.
|
|
*/
|
|
inline static int32_t atomic_int32_test_and_set(atomic_int32_t* d, int32_t ret) {
|
|
asm volatile ("xchgl %0, %1" : "=r"(ret) : "m"(d->counter), "0"(ret) : "memory");
|
|
return ret;
|
|
}
|
|
|
|
inline static int32_t atomic_int32_add(atomic_int32_t *d, int32_t i)
|
|
{
|
|
int32_t res = i;
|
|
asm volatile(LOCK "xaddl %0, %1" : "=r"(i) : "m"(d->counter), "0"(i));
|
|
return res+i;
|
|
}
|
|
|
|
inline static int32_t atomic_int32_sub(atomic_int32_t *d, int32_t i)
|
|
{
|
|
return atomic_int32_add(d, -i);
|
|
}
|
|
|
|
inline static int32_t atomic_int32_inc(atomic_int32_t* d) {
|
|
return atomic_int32_add(d, 1);
|
|
}
|
|
|
|
inline static int32_t atomic_int32_dec(atomic_int32_t* d) {
|
|
return atomic_int32_add(d, -1);
|
|
}
|
|
|
|
inline static int32_t atomic_int32_read(atomic_int32_t *d) {
|
|
return d->counter;
|
|
}
|
|
|
|
inline static void atomic_int32_set(atomic_int32_t *d, int32_t v) {
|
|
d->counter = v;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|