#include "spinlock.h"
int atomic_read(const atomic_t *v){
return v->val;
}
int atomic_dec_and_test(atomic_t *v){
if(v->val > 0){
v->val--;
return v->val == 0;
}
return 0;
}
void atomic_inc(atomic_t *v){
v->val++;
}
void atomic_set(atomic_t *v, int x){
v->val = x;
}
void spin_lock_init(spinlock_t *lock){
*lock = (spinlock_t){};
}
unsigned long _spin_lock_irqsave(spinlock_t *lock){
lock->val++;
return 0;
}
void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags){
lock->val--;
}
unsigned long _read_lock_irqsave(rwlock_t *lock){
lock->val++;
return 0;
}
void read_unlock_irqrestore(rwlock_t *lock, unsigned long flags){
lock->val--;
}
unsigned long _write_lock_irqsave(rwlock_t *lock){
lock->val++;
return 0;
}
void write_unlock_irqrestore(rwlock_t *lock, unsigned long flags){
lock->val--;
}
void init_MUTEX(struct semaphore *sem){
*sem = (struct semaphore){ .count = 1 };
}
void down(struct semaphore *sem){
sem->count--;
}
void up(struct semaphore *sem){
sem->count++;
}
