tests/lib/libpthread/t_swapcontext.c

   1 /* $NetBSD: t_swapcontext.c,v 1.1 2012/09/12 02:00:55 manu 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
  42 char stack[STACKSIZE];
  43 ucontext_t nctx;
  44 ucontext_t octx;
  45 void *oself;
  46 void *nself;
  47 int val1, val2;
  48
  49 /* ARGSUSED0 */
  50 static void
  51 swapfunc(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
  63         /* NOTREACHED */
  64         return;
  65 }
  66
  67 /* ARGSUSED0 */
  68 static void *
  69 threadfunc(void *arg)
  70 {
  71         nctx.uc_stack.ss_sp = stack;
  72         nctx.uc_stack.ss_size = sizeof(stack);
  73
  74         makecontext(&nctx, (void *)*swapfunc, 0);
  75
  76         oself = (void *)pthread_self();
  77         printf("before swapcontext self = %p\n", oself);
  78         PTHREAD_REQUIRE(swapcontext(&octx, &nctx));
  79
  80         /* NOTREACHED */
  81         return NULL;
  82 }
  83
  84
  85 ATF_TC(swapcontext1);
  86 ATF_TC_HEAD(swapcontext1, tc)
  87 {
  88         atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() "
  89             "alters pthread_self()");
  90 }
  91 ATF_TC_BODY(swapcontext1, tc)
  92 {
  93         pthread_t thread;
  94
  95         oself = (void *)&val1;
  96         nself = (void *)&val2;
  97
  98         printf("Testing if swapcontext() alters pthread_self()\n");
  99
 100         PTHREAD_REQUIRE(getcontext(&nctx));
 101         PTHREAD_REQUIRE(pthread_create(&thread, NULL, threadfunc, NULL));
 102
 103         return;
 104 }
 105
 106 ATF_TP_ADD_TCS(tp)
 107 {
 108         ATF_TP_ADD_TC(tp, swapcontext1);
 109
 110         return atf_no_error();
 111 }