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os-k/include/ke/spinlock.h

75 lines
2.8 KiB
C

//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: Spinlocks //
// //
// //
// Copyright © 2018-2020 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K 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 3 of the License, or //
// any later version. //
// //
// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
#ifndef _KERNEL_H
#include <kernel.h>
#endif
#ifndef _KALKERN_SPINLOCK_H
#define _KALKERN_SPINLOCK_H
#ifdef __cplusplus
extern "C" {
#endif
//----------------------------------------------------------------------------//
static inline void KeInitSpinlock(Spinlock_t *lock) { *lock = 0; }
static inline void KeAcquireSpinlockIRQ(Spinlock_t *lock)
{
while (1) {
if (!atomic_xchg_64(lock, (void *)1)) return;
while (*lock) __relax_cpu();
}
}
static inline void KeAcquireSpinlock(Spinlock_t *lock)
{
while (1) {
if (!atomic_xchg_64(lock, KeCurThread)) return;
while (*lock) __relax_cpu();
}
}
static inline void KeReleaseSpinlock(Spinlock_t *lock)
{
atomic_barrier();
assert(*lock == (ulong)KeCurThread);
*lock = 0;
}
static inline ulong KeTestSpinLock(Spinlock_t *lock)
{
return (ulong)atomic_xchg_64(lock, KeCurThread);
}
//------------------------------------------//
#ifdef __cplusplus
}
#endif
#endif