1 #ifndef _MACHINE_INSTR_H
2 #define _MACHINE_INSTR_H
5 __attribute__ ((unused))
6 compare_and_swap (volatile long *p, long oldval, long newval)
10 __asm__ __volatile__ ("lock; cmpxchgl %2, %1"
11 : "=a" (ret), "=m" (*p)
12 : "r" (newval), "m" (*p), "0" (oldval));
16 #define STORE_ORDER_BARRIER() __asm__ __volatile__ ("" : : : "memory");
17 #define MEMORY_BARRIER_AFTER_ATOMIC() /* nothing */
18 #define MEMORY_BARRIER() __asm__ __volatile__ ( \
19 "lock; add $0, 0(%%esp)" : : : "memory" );