/* 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, sec = 1, err = 1;
        pthread_t *thread_list = NULL;

        if (argc > 0)
                sec = atoi(argv[0]);

        if (sec <= 0) {
                fprintf(stderr, "Error: seconds (%d) must be >= 1\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;
                }
        }
        alarm(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);