-typedef volatile int tSpinlock;
-#define IS_LOCKED(lockptr) (!!(*(tSpinlock*)lockptr))
-#define LOCK(lockptr) do {int v=1;\
- while(v)__asm__ __volatile__("lock xchgl %%eax, (%%edi)":"=a"(v):"a"(1),"D"(lockptr));}while(0)
-#define RELEASE(lockptr) __asm__ __volatile__("lock andl $0, (%%edi)"::"D"(lockptr));