/* SPDX-License-Identifier: GPL-2.0 */#include <pthread.h>#include <stdlib.h>#include <signal.h>#include <unistd.h>#include <linux/compiler.h>#include "../tests.h" static volatile sig_atomic_t done; /* We want to check this symbol in perf report */noinline void test_loop(void); static void sighandler(int sig __maybe_unused){	done = 1;} noinline void test_loop(void){	while (!done);} static void *thfunc(void *arg){	void (*loop_fn)(void) = arg; 	loop_fn();	return NULL;} static int thloop(int argc, const char **argv){	int nt = 2, err = 1;	double sec = 1.0;	pthread_t *thread_list = NULL; 	if (argc > 0)		sec = atof(argv[0]); 	if (!(sec > 0.0)) {		fprintf(stderr, "Error: seconds (%f) must be > 0\n", sec);		return 1;	} 	if (argc > 1)		nt = atoi(argv[1]); 	if (nt <= 0) {		fprintf(stderr, "Error: thread count (%d) must be >= 1\n", nt);		return 1;	} 	signal(SIGINT, sighandler);	signal(SIGALRM, sighandler); 	thread_list = calloc(nt, sizeof(pthread_t));	if (thread_list == NULL) {		fprintf(stderr, "Error: malloc failed for %d threads\n", nt);		goto out;	}	for (int i = 1; i < nt; i++) {		int ret = pthread_create(&thread_list[i], NULL, thfunc, test_loop); 		if (ret) {			fprintf(stderr, "Error: failed to create thread %d\n", i);			done = 1; // Ensure started threads terminate.			goto out;		}	}	if (sec < 1.0) {		useconds_t usecs = (useconds_t)(sec * 1000000.0); 		ualarm(usecs > 0 ? usecs : 1, 0);	} else		alarm((unsigned int)sec);	test_loop();	err = 0;out:	for (int i = 1; i < nt; i++) {		if (thread_list && thread_list[i])			pthread_join(thread_list[i], /*retval=*/NULL);	}	free(thread_list);	return err;} DEFINE_WORKLOAD(thloop);