39e8b7e461
git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@38 315a16e6-25f9-4109-90ae-ca3045a26c18
108 lines
2 KiB
C
108 lines
2 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 __SPINLOCKS_H__
|
|
#define __SPINLOCKS_H__
|
|
|
|
#include <metalsvm/config.h>
|
|
#include <metalsvm/tasks.h>
|
|
#include <asm/irqflags.h>
|
|
#include <asm/atomic.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
typedef struct {
|
|
atomic_uint32_t lock;
|
|
} spinlock_t;
|
|
|
|
#define SPINLOCK_INIT { 0 }
|
|
|
|
inline static int spinlock_init(spinlock_t* s) {
|
|
if (BUILTIN_EXPECT(!s, 0))
|
|
return -1;
|
|
|
|
s->lock = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
inline static int spinlock_destroy(spinlock_t* s) {
|
|
if (BUILTIN_EXPECT(!s, 0))
|
|
return -1;
|
|
|
|
s->lock = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
inline static int spinlock_lock(spinlock_t* s) {
|
|
if (BUILTIN_EXPECT(!s, 0))
|
|
return -1;
|
|
|
|
while (atomic_uint32_test_and_set(&(s->lock)))
|
|
schedule();
|
|
|
|
return 0;
|
|
}
|
|
|
|
inline static int spinlock_trylock(spinlock_t* s) {
|
|
if (BUILTIN_EXPECT(!s, 0))
|
|
return -1;
|
|
|
|
return !atomic_uint32_test_and_set(&(s->lock));
|
|
}
|
|
|
|
inline static int spinlock_unlock(spinlock_t* s) {
|
|
if (BUILTIN_EXPECT(!s, 0))
|
|
return -1;
|
|
if (BUILTIN_EXPECT(!(s->lock), 0))
|
|
return -1;
|
|
|
|
s->lock = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
inline static int spinlock_lock_irqsave(spinlock_t* s) {
|
|
if (BUILTIN_EXPECT(!s, 0))
|
|
return -1;
|
|
|
|
irq_disable();
|
|
return spinlock_lock(s);
|
|
}
|
|
|
|
inline static int spinlock_unlock_irqsave(spinlock_t* s) {
|
|
int ret;
|
|
|
|
if (BUILTIN_EXPECT(!s, 0))
|
|
return -1;
|
|
|
|
ret = spinlock_unlock(s);
|
|
irq_enable();
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|