test-progs/mwait/mwait.c

9 // Make sure that flags and wait sit in different cache lines
10 volatile int flags[10];
17     flags[0] = flags[0] + 1;
25     flags[0] = flags[0] + 1;
39     flags[0] = 0;
43     __builtin_ia32_monitor ((void *)&flags, 0, 0);
45     // invalidate flags in this cpu's cache
52     // wait for other thread to modify flags
56         if (flags[0] != 2) {
63     } while (flags[0] != 2 && mwait_cnt < NUM_TRIES);
66     if (flags[0]==2) {
67         printf("mwait regression PASSED, flags[0] = %d\n", flags[0]);
69         printf("mwait regression FAILED, flags[0] = %d\n", flags[0]);