testcases/open_posix_testsuite/conformance/interfaces/pthread_barrier_init/4-1.c

/*
 * Copyright (c) 2002, Intel Corporation. All rights reserved.
 * This file is licensed under the GPL license.  For the full content
 * of this license, see the COPYING file at the top level of this
 * source tree.
 *
 * pthread_barrier_init()
 *
 * The pthread_barrier_init() function may fail if:
 * [EBUSY] The implementation has detected an attempt to reinitialize a barrier while it is
 * in use (for example, while being used in a pthread_barrier_wait() call) by
 * another thread.
 *
 * NOTE: This case will always pass.
 *
 * Steps:
 * 1. Main initialize barrier with count 2
 * 2. Main create a child thread
 * 3. Child thread call pthread_barrier_wait(), should block
 * 4. Main call pthread_barrier_init()
 */
#define _XOPEN_SOURCE 600
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include "posixtest.h"

static pthread_barrier_t barrier;
static int thread_state;
#define NOT_CREATED_THREAD 1
#define ENTERED_THREAD 2
#define EXITING_THREAD 3

/* child thread */
static void *fn_chld(void *arg)
{
	int rc = 0;

	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);

	thread_state = ENTERED_THREAD;

	printf("thread: barrier wait\n");
	rc = pthread_barrier_wait(&barrier);
	if (rc != 0 && rc != PTHREAD_BARRIER_SERIAL_THREAD) {
		printf("Error: thread: pthread_barrier_wait() got unexpected "
		       "return code : %d\n", rc);
		exit(PTS_UNRESOLVED);
	} else if (rc == PTHREAD_BARRIER_SERIAL_THREAD) {
		printf("thread: got PTHREAD_BARRIER_SERIAL_THREAD\n");
	}

	thread_state = EXITING_THREAD;
	pthread_exit(0);
	return NULL;
}

void sig_handler()
{
	printf("Interrupted by SIGALRM\n");
	printf("Test PASSED: main blocked on barrier init\n");
	exit(PTS_PASS);
}

int main(void)
{
	int cnt = 0;
	int rc;
	pthread_t child_thread;
	struct sigaction act;

	/* Set up main thread to handle SIGALRM */
	act.sa_flags = 0;
	act.sa_handler = sig_handler;
	sigfillset(&act.sa_mask);
	sigaction(SIGALRM, &act, 0);

	printf("main: Initialize barrier with count = 2\n");
	if (pthread_barrier_init(&barrier, NULL, 2) != 0) {
		printf("main: Error at pthread_barrier_init()\n");
		return PTS_UNRESOLVED;
	}

	printf("main: create child thread\n");
	thread_state = NOT_CREATED_THREAD;
	if (pthread_create(&child_thread, NULL, fn_chld, NULL) != 0) {
		printf("main: Error at pthread_create()\n");
		return PTS_UNRESOLVED;
	}

	/* Expect the child to block */
	cnt = 0;
	do {
		sleep(1);
	} while (thread_state != EXITING_THREAD && cnt++ < 2);

	if (thread_state == EXITING_THREAD) {
		/* child thread did not block */
		printf("Test FAILED: child thread did not block on "
		       "pthread_barrier_wait()\n");
		exit(PTS_FAIL);
	} else if (thread_state != ENTERED_THREAD) {
		printf("Unexpected thread state\n");
		exit(PTS_UNRESOLVED);
	}

	/* Just in case main gets in a blocked state, send me a SIGALRM after 2 secs */
	alarm(2);

	printf("main: reinitilize barrier while thread is blocking on it\n");
	rc = pthread_barrier_init(&barrier, NULL, 2);

	if (rc == EBUSY) {
		printf("main: pthread_barrier_init() correctly got EBUSY");
		printf("Test PASSED\n");
	} else {
		printf("main: got return code: %d, %s\n", rc, strerror(rc));
		printf
		    ("Test PASSED: Note*: Expected EBUSY, but standard says 'may' fail.\n");
	}

	/* Cancel thread in case it is still blocked */
	pthread_cancel(child_thread);

	return PTS_PASS;
}