[mirror_ubuntu-focal-kernel.git] / tools / lib / lockdep / tests / ABBA_2threads.c

// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <pthread.h>

pthread_mutex_t a = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t b = PTHREAD_MUTEX_INITIALIZER;
pthread_barrier_t bar;

void *ba_lock(void *arg)
{
	int ret, i;

	pthread_mutex_lock(&b);

	if (pthread_barrier_wait(&bar) == PTHREAD_BARRIER_SERIAL_THREAD)
		pthread_barrier_destroy(&bar);

	pthread_mutex_lock(&a);

	pthread_mutex_unlock(&a);
	pthread_mutex_unlock(&b);
}

int main(void)
{
	pthread_t t;

	pthread_barrier_init(&bar, NULL, 2);

	if (pthread_create(&t, NULL, ba_lock, NULL)) {
		fprintf(stderr, "pthread_create() failed\n");
		return 1;
	}
	pthread_mutex_lock(&a);

	if (pthread_barrier_wait(&bar) == PTHREAD_BARRIER_SERIAL_THREAD)
		pthread_barrier_destroy(&bar);

	pthread_mutex_lock(&b);

	pthread_mutex_unlock(&b);
	pthread_mutex_unlock(&a);

	pthread_join(t, NULL);

	return 0;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
11a1ac20 AAF	2	#include <stdio.h>
	3	#include <pthread.h>
	4
	5	pthread_mutex_t a = PTHREAD_MUTEX_INITIALIZER;
	6	pthread_mutex_t b = PTHREAD_MUTEX_INITIALIZER;
	7	pthread_barrier_t bar;
	8
	9	void ba_lock(void arg)
	10	{
	11	int ret, i;
	12
	13	pthread_mutex_lock(&b);
	14
	15	if (pthread_barrier_wait(&bar) == PTHREAD_BARRIER_SERIAL_THREAD)
	16	pthread_barrier_destroy(&bar);
	17
	18	pthread_mutex_lock(&a);
	19
	20	pthread_mutex_unlock(&a);
	21	pthread_mutex_unlock(&b);
	22	}
	23
	24	int main(void)
	25	{
	26	pthread_t t;
	27
	28	pthread_barrier_init(&bar, NULL, 2);
	29
	30	if (pthread_create(&t, NULL, ba_lock, NULL)) {
	31	fprintf(stderr, "pthread_create() failed\n");
	32	return 1;
	33	}
	34	pthread_mutex_lock(&a);
	35
	36	if (pthread_barrier_wait(&bar) == PTHREAD_BARRIER_SERIAL_THREAD)
	37	pthread_barrier_destroy(&bar);
	38
	39	pthread_mutex_lock(&b);
	40
	41	pthread_mutex_unlock(&b);
	42	pthread_mutex_unlock(&a);
	43
	44	pthread_join(t, NULL);
	45
	46	return 0;
	47	}