58 lines
1.1 KiB
C++
58 lines
1.1 KiB
C++
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/*
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* \brief Spin lock
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* \author Norman Feske
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* \date 2012-01-27
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*/
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/*
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* Copyright (C) 2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <base/env.h>
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#include <cpu/atomic.h>
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#include <base/printf.h>
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extern "C" {
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#include <dde_kit/spin_lock.h>
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}
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static inline void spinlock_lock(volatile int *lock_variable)
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{
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while (!Genode::cmpxchg(lock_variable, DDE_KIT_SPIN_LOCK_UNLOCKED,
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DDE_KIT_SPIN_LOCK_LOCKED));
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}
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extern "C" void dde_kit_spin_lock_init(dde_kit_spin_lock *spin_lock)
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{
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*spin_lock = DDE_KIT_SPIN_LOCK_UNLOCKED;
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}
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extern "C" void dde_kit_spin_lock_lock(dde_kit_spin_lock *spin_lock)
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{
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spinlock_lock(spin_lock);
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}
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extern "C" int dde_kit_spin_lock_try_lock(dde_kit_spin_lock *spin_lock)
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{
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PERR("not implemented - will potentially block");
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spinlock_lock(spin_lock);
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/* success */
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return 0;
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}
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extern "C" void dde_kit_spin_lock_unlock(dde_kit_spin_lock *spin_lock)
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{
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*spin_lock = DDE_KIT_SPIN_LOCK_UNLOCKED;
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}
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