t_swapcontext.c revision 272458 
1/* $NetBSD: t_swapcontext.c,v 1.2 2014/08/25 16:31:15 bouyer Exp $ */
2
3/*
4 * Copyright (c) 2012 Emmanuel Dreyfus. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
19 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__RCSID("$NetBSD");
30
31#include <pthread.h>
32#include <ucontext.h>
33#include <stdio.h>
34#include <stdlib.h>
35
36#include <atf-c.h>
37
38#include "h_common.h"
39
40#define STACKSIZE 65536
41
42char stack[STACKSIZE];
43ucontext_t nctx;
44ucontext_t octx;
45void *oself;
46void *nself;
47int val1, val2;
48
49/* ARGSUSED0 */
50static void
51swapfunc(void *arg)
52{
53	/*
54	 * If the test fails, we are very likely to crash
55	 * without the opportunity to report
56	 */
57	nself = (void *)pthread_self();
58	printf("after swapcontext self = %p\n", nself);
59
60	ATF_REQUIRE_EQ(oself, nself);
61	printf("Test succeeded\n");
62	/* Go back in main */
63	ATF_REQUIRE(swapcontext(&nctx, &octx));
64
65	/* NOTREACHED */
66	return;
67}
68
69/* ARGSUSED0 */
70static void *
71threadfunc(void *arg)
72{
73	nctx.uc_stack.ss_sp = stack;
74	nctx.uc_stack.ss_size = sizeof(stack);
75
76	makecontext(&nctx, (void *)*swapfunc, 0);
77
78	oself = (void *)pthread_self();
79	printf("before swapcontext self = %p\n", oself);
80	PTHREAD_REQUIRE(swapcontext(&octx, &nctx));
81
82	/* NOTREACHED */
83	return NULL;
84}
85
86
87ATF_TC(swapcontext1);
88ATF_TC_HEAD(swapcontext1, tc)
89{
90	atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() "
91	    "alters pthread_self()");
92}
93ATF_TC_BODY(swapcontext1, tc)
94{
95	pthread_t thread;
96
97	oself = (void *)&val1;
98	nself = (void *)&val2;
99
100	printf("Testing if swapcontext() alters pthread_self()\n");
101
102	PTHREAD_REQUIRE(getcontext(&nctx));
103	PTHREAD_REQUIRE(pthread_create(&thread, NULL, threadfunc, NULL));
104	PTHREAD_REQUIRE(pthread_join(thread, NULL));
105}
106
107ATF_TP_ADD_TCS(tp)
108{
109	ATF_TP_ADD_TC(tp, swapcontext1);
110
111	return atf_no_error();
112}
113