t_swapcontext.c revision 313515 
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#ifdef __FreeBSD__
32#include <sys/types.h>
33#include <errno.h>
34#include <string.h>
35#endif
36#include <pthread.h>
37#include <ucontext.h>
38#include <stdio.h>
39#include <stdlib.h>
40
41#include <atf-c.h>
42
43#include "h_common.h"
44
45#define STACKSIZE 65536
46
47char stack[STACKSIZE];
48ucontext_t nctx;
49ucontext_t octx;
50void *oself;
51void *nself;
52int val1, val2;
53
54/* ARGSUSED0 */
55static void
56swapfunc(void *arg)
57{
58	/*
59	 * If the test fails, we are very likely to crash
60	 * without the opportunity to report
61	 */
62	nself = (void *)pthread_self();
63	printf("after swapcontext self = %p\n", nself);
64
65	ATF_REQUIRE_EQ(oself, nself);
66	printf("Test succeeded\n");
67	/* Go back in main */
68	ATF_REQUIRE(swapcontext(&nctx, &octx));
69
70	/* NOTREACHED */
71	return;
72}
73
74/* ARGSUSED0 */
75static void *
76threadfunc(void *arg)
77{
78	nctx.uc_stack.ss_sp = stack;
79	nctx.uc_stack.ss_size = sizeof(stack);
80
81	makecontext(&nctx, (void *)*swapfunc, 0);
82
83	oself = (void *)pthread_self();
84	printf("before swapcontext self = %p\n", oself);
85#ifdef	__FreeBSD__
86	ATF_REQUIRE_MSG(swapcontext(&octx, &nctx) != -1, "swapcontext failed: %s",
87	    strerror(errno));
88#else
89	PTHREAD_REQUIRE(swapcontext(&octx, &nctx));
90#endif
91
92	/* NOTREACHED */
93	return NULL;
94}
95
96
97ATF_TC(swapcontext1);
98ATF_TC_HEAD(swapcontext1, tc)
99{
100	atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() "
101	    "alters pthread_self()");
102}
103ATF_TC_BODY(swapcontext1, tc)
104{
105	pthread_t thread;
106
107#if defined(__FreeBSD__) && defined(__mips__)
108	/*
109	 * MIPS modifies TLS pointer in set_mcontext(), so
110	 * swapping contexts obtained from different threads
111	 * gives us different pthread_self() return value.
112	 */
113	atf_tc_skip("Platform is not supported.");
114#endif
115
116	oself = (void *)&val1;
117	nself = (void *)&val2;
118
119	printf("Testing if swapcontext() alters pthread_self()\n");
120
121#ifdef	__FreeBSD__
122	ATF_REQUIRE_MSG(getcontext(&nctx) != -1, "getcontext failed: %s",
123	    strerror(errno));
124#else
125	PTHREAD_REQUIRE(getcontext(&nctx));
126#endif
127	PTHREAD_REQUIRE(pthread_create(&thread, NULL, threadfunc, NULL));
128	PTHREAD_REQUIRE(pthread_join(thread, NULL));
129}
130
131ATF_TP_ADD_TCS(tp)
132{
133	ATF_TP_ADD_TC(tp, swapcontext1);
134
135	return atf_no_error();
136}
137