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75 lines
2.8 KiB
C
75 lines
2.8 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: Spinlocks //
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// //
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// //
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// Copyright © 2018-2020 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#ifndef _KERNEL_H
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#include <kernel.h>
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#endif
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#ifndef _KALKERN_SPINLOCK_H
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#define _KALKERN_SPINLOCK_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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//----------------------------------------------------------------------------//
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static inline void KeInitSpinlock(Spinlock_t *lock) { *lock = 0; }
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static inline void KeAcquireSpinlockIRQ(Spinlock_t *lock)
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{
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while (1) {
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if (!atomic_xchg_64(lock, (void *)1)) return;
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while (*lock) __relax_cpu();
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}
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}
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static inline void KeAcquireSpinlock(Spinlock_t *lock)
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{
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while (1) {
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if (!atomic_xchg_64(lock, KeCurThread)) return;
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while (*lock) __relax_cpu();
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}
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}
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static inline void KeReleaseSpinlock(Spinlock_t *lock)
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{
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atomic_barrier();
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assert(*lock == (ulong)KeCurThread);
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*lock = 0;
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}
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static inline ulong KeTestSpinLock(Spinlock_t *lock)
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{
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return (ulong)atomic_xchg_64(lock, KeCurThread);
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}
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//------------------------------------------//
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#ifdef __cplusplus
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}
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#endif
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#endif
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