Astral/kernel-src/include/spinlock.h

#ifndef _SPINLOCK_H
#define _SPINLOCK_H

#include <stdbool.h>
#include <kernel/interrupt.h>

typedef int spinlock_t;

#define SPINLOCK_INIT_VALUE 0
#define SPINLOCK_INIT(x) x = SPINLOCK_INIT_VALUE
#define SPINLOCK_DEFINE(x) spinlock_t x = SPINLOCK_INIT_VALUE

static inline void spinlock_acquire(spinlock_t *lock){
	while(!__sync_bool_compare_and_swap(lock, 0, 1)) asm("pause");
}

static inline bool spinlock_acquireirqclear(spinlock_t *lock){
	bool ret = interrupt_set(false);
	spinlock_acquire(lock);
	return ret;
}

static inline bool spinlock_try(spinlock_t *lock){
	return __sync_bool_compare_and_swap(lock, 0, 1);
}

static inline void spinlock_release(spinlock_t *lock){
	*lock = 0;
}

static inline void spinlock_releaseirqrestore(spinlock_t *lock, bool irqstate){
	spinlock_release(lock);
	interrupt_set(irqstate);
}

static inline long spinlock_acquireraiseipl(spinlock_t *lock, long ipl) {
	long ret = interrupt_raiseipl(ipl);
	spinlock_acquire(lock);
	return ret;
}

static inline void spinlock_releaseloweripl(spinlock_t *lock, long ipl) {
	spinlock_release(lock);
	interrupt_loweripl(ipl);
}

#endif