| #define ARRAY_SIZE(x) (sizeof(x)/sizeof(*(x))) | |
| void err(const char *msg); | |
| #define NEW(x) ((x) = xalloc(sizeof(*(x)))) | |
| void *xalloc(size_t sz); | |
| #ifdef __GNUC__ | |
| #define barrier() asm volatile("" ::: "memory") | |
| #else | |
| #define barrier() do {} while(0) | |
| #endif |