Attachment 183881 Details for Bug 239604 – test case

test case

vcs_stress.c (text/x-csrc), 2.43 KB, created by Aristeu Rozanski on 2007-08-31 20:00:02 UTC

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Filename:

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Creator: Aristeu Rozanski

Created: 2007-08-31 20:00:02 UTC

Size: 2.43 KB

patch

obsolete

>#include <stdio.h>
>#include <stdlib.h>
>#include <unistd.h>
>#include <pthread.h>
>#include <sys/ioctl.h>
>#include <sys/types.h>
>#include <fcntl.h>
>#include <errno.h>
>#include <linux/vt.h>
>
>#define TTY_FILE "/dev/tty0"
>#define DELAY_PRE_RUN_MAX 500
>#define DELAY_OPEN_MAX 1000
>#define DELAY_CLOSE_MAX 1000
>#define NUM_OPEN_THREADS 50
>#define NUM_VTSWITCH_THREADS 20
>#ifndef TERMS
>#define TERMS 7
>#endif
>#define RUNS 50000
>
>struct thread_data {
>	pthread_cond_t *cond;
>	pthread_mutex_t *mutex;
>};
>
>static void *thread_open(void *arg)
>{
>	struct thread_data *data = arg;
>	int fd, i = RUNS;
>
>	pthread_mutex_lock(data->mutex);
>	pthread_cond_wait(data->cond, data->mutex);
>	pthread_mutex_unlock(data->mutex);
>
>	while(i--) {
>		usleep(random() % DELAY_PRE_RUN_MAX);
>
>		fd = open(TTY_FILE, O_RDWR);
>
>		usleep(random() % DELAY_OPEN_MAX);
>
>		close(fd);
>	}
>
>	return NULL;
>}
>
>static void *thread_chvt(void *arg)
>{
>	struct thread_data *data = arg;
>	int fd, i = RUNS;
>
>	pthread_mutex_lock(data->mutex);
>	pthread_cond_wait(data->cond, data->mutex);
>	pthread_mutex_unlock(data->mutex);
>
>	while(i--) {
>		usleep(random() % DELAY_PRE_RUN_MAX);
>
>		fd = open(TTY_FILE, O_RDWR);
>
>		usleep(random() % DELAY_OPEN_MAX);
>
>		if (ioctl(fd, VT_ACTIVATE, (random() % TERMS) + 1))
>			perror("Error activating tty");
>		else
>			usleep(random() % DELAY_CLOSE_MAX);
>		close(fd);
>	}
>
>	return NULL;
>}
>
>static pthread_t open_threads[NUM_OPEN_THREADS];
>static pthread_t vtswitch_threads[NUM_VTSWITCH_THREADS];
>int main(int argc, char *argv[])
>{
>	struct thread_data data;
>	pthread_mutex_t mutex;
>	pthread_cond_t cond;
>	int i;
>
>	pthread_mutex_init(&mutex, NULL);
>	pthread_cond_init(&cond, NULL);
>
>	data.mutex = &mutex;
>	data.cond = &cond;
>
>	printf("Creating threads...\n");
>	fflush(stdout);
>
>	for (i = 0; i < NUM_OPEN_THREADS; i++)
>		if (pthread_create(&open_threads[i], NULL, thread_open, &data)) {
>			perror("Error creating thread");
>			return 1;
>		}
>
>	for (i = 0; i < NUM_VTSWITCH_THREADS; i++)
>		if (pthread_create(&vtswitch_threads[i], NULL, thread_chvt, &data)) {
>			perror("Error creating thread");
>			return 1;
>		}
>
>	printf("Done. Waiting one second... ");
>	fflush(stdout);
>	sleep(1);
>	printf("starting test\n");
>	fflush(stdout);
>
>	pthread_mutex_lock(&mutex);
>	pthread_cond_broadcast(&cond);
>	pthread_mutex_unlock(&mutex);
>
>	for (i = 0; i < NUM_OPEN_THREADS; i++)
>		pthread_join(open_threads[i], NULL);
>
>	for (i = 0; i < NUM_VTSWITCH_THREADS; i++)
>		pthread_join(vtswitch_threads[i], NULL);
>
>	printf("test done\n");
>
>	return 0;
>}
>

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Attachments on bug 239604: 183881