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133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
/* Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <error.h>
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#include <limits.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ucontext.h>
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#define N 4
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static char stacks[N][PTHREAD_STACK_MIN];
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static ucontext_t ctx[N][2];
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static volatile int failures;
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static void
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fct (long int n)
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{
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/* Just to use the thread local descriptor. */
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printf ("%ld: in %s now\n", n, __FUNCTION__);
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errno = 0;
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}
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static void *
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tf (void *arg)
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{
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int n = (int) (long int) arg;
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if (getcontext (&ctx[n][1]) != 0)
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{
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printf ("%d: cannot get context: %m\n", n);
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exit (1);
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}
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printf ("%d: %s: before makecontext\n", n, __FUNCTION__);
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ctx[n][1].uc_stack.ss_sp = stacks[n];
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ctx[n][1].uc_stack.ss_size = PTHREAD_STACK_MIN;
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ctx[n][1].uc_link = &ctx[n][0];
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makecontext (&ctx[n][1], (void (*) (void)) fct, 1, (long int) n);
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printf ("%d: %s: before swapcontext\n", n, __FUNCTION__);
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if (swapcontext (&ctx[n][0], &ctx[n][1]) != 0)
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{
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++failures;
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printf ("%d: %s: swapcontext failed\n", n, __FUNCTION__);
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}
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else
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printf ("%d: back in %s\n", n, __FUNCTION__);
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return NULL;
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}
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static volatile int global;
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static int
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do_test (void)
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{
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int n;
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pthread_t th[N];
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ucontext_t mctx;
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puts ("making contexts");
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if (getcontext (&mctx) != 0)
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{
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if (errno == ENOSYS)
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{
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puts ("context handling not supported");
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exit (0);
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}
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printf ("%s: getcontext: %m\n", __FUNCTION__);
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exit (1);
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}
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/* Play some tricks with this context. */
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if (++global == 1)
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if (setcontext (&mctx) != 0)
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{
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puts ("setcontext failed");
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exit (1);
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}
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if (global != 2)
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{
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puts ("global not incremented twice");
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exit (1);
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}
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puts ("global OK");
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for (n = 0; n < N; ++n)
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if (pthread_create (&th[n], NULL, tf, (void *) (long int) n) != 0)
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{
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puts ("create failed");
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exit (1);
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}
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for (n = 0; n < N; ++n)
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if (pthread_join (th[n], NULL) != 0)
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{
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puts ("join failed");
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exit (1);
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}
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return failures;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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