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- #include "../common/glib.h"
- typedef struct
- {
- __volatile__ char lock;
- } spinlock_t;
- void spin_init(spinlock_t *lock)
- {
- lock->lock = 1;
- }
- void spin_lock(spinlock_t *lock)
- {
- __asm__ __volatile__("1: \n\t"
- "lock decq %0 \n\t"
- "jns 3f \n\t"
- "2: \n\t"
- "pause \n\t"
- "cmpq $0, %0 \n\t"
- "jle 2b \n\t"
- "jmp 1b \n\t"
- "3:"
- : "=m"(lock->lock)::"memory");
- }
- void spin_unlock(spinlock_t * lock)
- {
- __asm__ __volatile__("movq $1, %0 \n\t"
- :"=m"(lock->lock)::"memory");
- }
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