tools/testing/selftests/timens/clock_nanosleep.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/timens/clock_nanosleep.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/timens/clock_nanosleep.c
Extension
.c
Size
3063 bytes
Lines
152
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct thread_args {
	struct timespec *now, *rem;
	pthread_mutex_t *lock;
	int clockid;
	int abs;
};

void *call_nanosleep(void *_args)
{
	struct thread_args *args = _args;

	clock_nanosleep(args->clockid, args->abs ? TIMER_ABSTIME : 0, args->now, args->rem);
	pthread_mutex_unlock(args->lock);
	return NULL;
}

static int run_test(int clockid, int abs)
{
	struct timespec now = {}, rem;
	struct thread_args args = { .now = &now, .rem = &rem, .clockid = clockid};
	struct timespec start;
	pthread_mutex_t lock;
	pthread_t thread;
	int j, ok, ret;

	signal(SIGUSR1, test_sig);
	signal(SIGUSR2, test_sig);

	pthread_mutex_init(&lock, NULL);
	pthread_mutex_lock(&lock);

	if (clock_gettime(clockid, &start) == -1) {
		if (errno == EINVAL && check_skip(clockid))
			return 0;
		return pr_perror("clock_gettime");
	}


	if (abs) {
		now.tv_sec = start.tv_sec;
		now.tv_nsec = start.tv_nsec;
	}

	now.tv_sec += 3600;
	args.abs = abs;
	args.lock = &lock;
	ret = pthread_create(&thread, NULL, call_nanosleep, &args);
	if (ret != 0) {
		pr_err("Unable to create a thread: %s", strerror(ret));
		return 1;
	}

	/* Wait when the thread will call clock_nanosleep(). */
	ok = 0;
	for (j = 0; j < 8; j++) {
		/* The maximum timeout is about 5 seconds. */
		usleep(10000 << j);

		/* Try to interrupt clock_nanosleep(). */
		pthread_kill(thread, SIGUSR1);

		usleep(10000 << j);
		/* Check whether clock_nanosleep() has been interrupted or not. */
		if (pthread_mutex_trylock(&lock) == 0) {
			/**/
			ok = 1;
			break;
		}
	}
	if (!ok)
		pthread_kill(thread, SIGUSR2);
	pthread_join(thread, NULL);
	pthread_mutex_destroy(&lock);

	if (!ok) {
		ksft_test_result_pass("clockid: %d abs:%d timeout\n", clockid, abs);
		return 1;
	}

	if (rem.tv_sec < 3300 || rem.tv_sec > 3900) {
		pr_fail("clockid: %d abs: %d remain: %ld\n",
			clockid, abs, rem.tv_sec);
		return 1;
	}
	ksft_test_result_pass("clockid: %d abs:%d\n", clockid, abs);

	return 0;
}

int main(int argc, char *argv[])

Annotation

Implementation Notes