/* testing pthread mutex behaviour with various attributes */

#include <pthread.h>

#include <semaphore.h>

#include <stdio.h>

#include <errno.h>

#include <string.h>

#include "test.h"

#define T(f) if ((r=(f))) t_error(#f " failed: %s\n", strerror(r))

#define E(f) if (f) t_error(#f " failed: %s\n", strerror(errno))

static void *relock(void *arg)

{

	void **a = arg;

	int r;

	T(pthread_mutex_lock(a[0]));

	E(sem_post(a[1]));

	*(int*)a[2] = pthread_mutex_lock(a[0]);

	E(sem_post(a[1]));

	T(pthread_mutex_unlock(a[0]));

	if (*(int*)a[2] == 0)

		T(pthread_mutex_unlock(a[0]));

	return 0;

}

static int test_relock(int mtype)

{

	struct timespec ts;

	pthread_t t;

	pthread_mutex_t m;

	pthread_mutexattr_t ma;

	sem_t s;

	int i;

	int r;

	void *p;

	void *a[] = {&m,&s,&i};

	T(pthread_mutexattr_init(&ma);;

	T(pthread_mutexattr_settype(&ma, mtype));

	T(pthread_mutex_init(a[0], &ma);;

	T(pthread_mutexattr_destroy(&ma);;

	E(sem_init(a[1], 0, 0));

	T(pthread_create(&t, 0, relock, a));

	E(sem_wait(a[1]));

	E(clock_gettime(CLOCK_REALTIME, &ts);;

	ts.tv_nsec += 100*1000*1000;

	if (ts.tv_nsec >= 1000*1000*1000) {

		ts.tv_nsec -= 1000*1000*1000;

		ts.tv_sec += 1;

	}

	r = sem_timedwait(a[1],&ts);

	if (r == -1) {

		if (errno != ETIMEDOUT)

			t_error("sem_timedwait failed with unexpected error: %s\n", strerror(errno));

		/* leave the deadlocked relock thread running */

		return -1;

	}

	T(pthread_join(t, &p);;

	T(pthread_mutex_destroy(a[0]));

	E(sem_destroy(a[1]));

	return i;

}

static void *unlock(void *arg)

{

	void **a = arg;

	*(int*)a[1] = pthread_mutex_unlock(a[0]);

	return 0;

}

static int test_unlock(int mtype)

{

	pthread_t t;

	pthread_mutex_t m;

	pthread_mutexattr_t ma;

	int i;

	int r;

	void *p;

	void *a[] = {&m,&i};

	T(pthread_mutexattr_init(&ma);;

	T(pthread_mutexattr_settype(&ma, mtype));

	T(pthread_mutex_init(a[0], &ma);;

	T(pthread_mutexattr_destroy(&ma);;

	T(pthread_create(&t, 0, unlock, a));

	T(pthread_join(t, &p);;

	T(pthread_mutex_destroy(a[0]));

	return i;

}

static int test_unlock_other(int mtype)

{

	pthread_t t;

	pthread_mutex_t m;

	pthread_mutexattr_t ma;

	int i;

	int r;

	void *p;

	void *a[] = {&m,&i};

	T(pthread_mutexattr_init(&ma);;

	T(pthread_mutexattr_settype(&ma, mtype));

	T(pthread_mutex_init(a[0], &ma);;

	T(pthread_mutexattr_destroy(&ma);;

	T(pthread_mutex_lock(a[0]));

	T(pthread_create(&t, 0, unlock, a));

	T(pthread_join(t, &p);;

	T(pthread_mutex_unlock(a[0]));

	T(pthread_mutex_destroy(a[0]));

	return i;

}

static void test_mutexattr()

{

	pthread_mutex_t m;

	pthread_mutexattr_t a;

	int r;

	int i;

	T(pthread_mutexattr_init(&a);;

	T(pthread_mutexattr_gettype(&a, &i);;

	if (i != PTHREAD_MUTEX_DEFAULT)

		t_error("default mutex type is %d, wanted PTHREAD_MUTEX_DEFAULT (%d)\n", i, PTHREAD_MUTEX_DEFAULT);

	T(pthread_mutexattr_settype(&a, PTHREAD_MUTEX_ERRORCHECK));

	T(pthread_mutexattr_gettype(&a, &i);;

	if (i != PTHREAD_MUTEX_ERRORCHECK)

		t_error("setting error check mutex type failed failed: got %d, wanted %d\n", i, PTHREAD_MUTEX_ERRORCHECK);

	T(pthread_mutexattr_destroy(&a);;

}

int main(void)

{

	int i;

	test_mutexattr();

	i = test_relock(PTHREAD_MUTEX_NORMAL);

	if (i != -1)

		t_error("PTHREAD_MUTEX_NORMAL relock did not deadlock, got %s\n", strerror(i));

	i = test_relock(PTHREAD_MUTEX_ERRORCHECK);

	if (i != EDEADLK)

		t_error("PTHREAD_MUTEX_ERRORCHECK relock did not return EDEADLK, got %s\n", i==-1?"deadlock":strerror(i));

	i = test_relock(PTHREAD_MUTEX_RECURSIVE);

	if (i != 0)

		t_error("PTHREAD_MUTEX_RECURSIVE relock did not succed, got %s\n", i==-1?"deadlock":strerror(i));

	i = test_unlock(PTHREAD_MUTEX_ERRORCHECK);

	if (i != EPERM)

		t_error("PTHREAD_MUTEX_ERRORCHECK unlock did not return EPERM, got %s\n", strerror(i));

	i = test_unlock(PTHREAD_MUTEX_RECURSIVE);

	if (i != EPERM)

		t_error("PTHREAD_MUTEX_RECURSIVE unlock did not return EPERM, got %s\n", strerror(i));

	i = test_unlock_other(PTHREAD_MUTEX_ERRORCHECK);

	if (i != EPERM)

		t_error("PTHREAD_MUTEX_ERRORCHECK unlock did not return EPERM, got %s\n", strerror(i));

	i = test_unlock_other(PTHREAD_MUTEX_RECURSIVE);

	if (i != EPERM)

		t_error("PTHREAD_MUTEX_RECURSIVE unlock did not return EPERM, got %s\n", strerror(i));

	return t_status;

}