1 #ifndef _MACHINE_INSTR_H
2 #define _MACHINE_INSTR_H
5 __attribute__ ((unused))
6 atomic_add (volatile int *mem, int val)
8 __asm__ __volatile__ ("lock; addl %1,%0"
10 : "ir" (val), "m" (*mem));
14 __attribute__ ((unused))
15 compare_and_swap (volatile long *p, long oldval, long newval)
19 __asm__ __volatile__ ("lock; cmpxchgq %2, %1"
20 : "=a" (ret), "=m" (*p)
21 : "r" (newval), "m" (*p), "0" (oldval));
25 #define STORE_ORDER_BARRIER() __asm__ __volatile__ ("" : : : "memory");
26 #define MEMORY_BARRIER_BEFORE_ATOMIC() __asm__ __volatile__ ("" : : : "memory");
27 #define MEMORY_BARRIER_AFTER_ATOMIC() __asm__ __volatile__ ("" : : : "memory");
28 #define MEMORY_BARRIER() __asm__ __volatile__ ( \
29 "mfence" : : : "memory" );