1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <pthread.h> 3 #include <stdlib.h> 4 #include <signal.h> 5 #include <unistd.h> 6 #include <linux/compiler.h> 7 #include "../tests.h" 8 9 static volatile sig_atomic_t done; 10 static volatile unsigned count; 11 12 /* We want to check this symbol in perf report */ 13 noinline void test_loop(void); 14 15 static void sighandler(int sig __maybe_unused) 16 { 17 done = 1; 18 } 19 20 noinline void test_loop(void) 21 { 22 while (!done) 23 __atomic_fetch_add(&count, 1, __ATOMIC_RELAXED); 24 } 25 26 static void *thfunc(void *arg) 27 { 28 void (*loop_fn)(void) = arg; 29 30 loop_fn(); 31 return NULL; 32 } 33 34 static int thloop(int argc, const char **argv) 35 { 36 int sec = 1; 37 pthread_t th; 38 39 if (argc > 0) 40 sec = atoi(argv[0]); 41 42 signal(SIGINT, sighandler); 43 signal(SIGALRM, sighandler); 44 alarm(sec); 45 46 pthread_create(&th, NULL, thfunc, test_loop); 47 test_loop(); 48 pthread_join(th, NULL); 49 50 return 0; 51 } 52 53 DEFINE_WORKLOAD(thloop); 54