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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
commita334319f6530564d22e775935d9c91663623a1b4 (patch)
treeb5877475619e4c938e98757d518bb1e9cbead751 /linuxthreads/Examples/ex9.c
parent0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (diff)
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(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
Diffstat (limited to 'linuxthreads/Examples/ex9.c')
-rw-r--r--linuxthreads/Examples/ex9.c98
1 files changed, 98 insertions, 0 deletions
diff --git a/linuxthreads/Examples/ex9.c b/linuxthreads/Examples/ex9.c
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+/* Tests for pthread_barrier_* functions.
+ Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
+ Contributed by Kaz Kylheku <kaz@ashi.footprints.net>, 2000.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <errno.h>
+#include <error.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+#define NUM_THREADS 10
+#define NUM_ITERS 500
+
+static void *thread (void *) __attribute__ ((__noreturn__));
+static pthread_barrier_t barrier;
+
+int
+main (void)
+{
+ pthread_t thread_list[NUM_THREADS];
+ int i;
+
+ if (pthread_barrier_init (&barrier, NULL, NUM_THREADS + 1) != 0)
+ error (EXIT_FAILURE, 0, "cannot initialize barrier");
+
+ for (i = 0; i < NUM_THREADS; i++)
+ {
+ if (pthread_create (&thread_list[i], NULL, thread, NULL) != 0)
+ error (EXIT_FAILURE, 0, "cannot create thread");
+ }
+
+ (void) thread (NULL);
+
+ for (i = 0; i < NUM_THREADS; i++)
+ {
+ pthread_join(thread_list[i], NULL);
+ }
+
+ return 0;
+}
+
+
+static void *
+thread (void *arg)
+{
+ int i;
+ pthread_t self = pthread_self ();
+ static pthread_t last_serial_thread;
+ static int linecount; /* protected by flockfile(stdout) */
+
+ for (i = 0; i < NUM_ITERS; i++)
+ {
+ switch (pthread_barrier_wait (&barrier))
+ {
+ case 0:
+ flockfile (stdout);
+ printf ("%04d: non-serial thread %lu\n", ++linecount,
+ (unsigned long) self);
+ funlockfile (stdout);
+ break;
+ case PTHREAD_BARRIER_SERIAL_THREAD:
+ flockfile (stdout);
+ printf ("%04d: serial thread %lu\n", ++linecount,
+ (unsigned long) self);
+ funlockfile (stdout);
+ last_serial_thread = self;
+ break;
+ default:
+ /* Huh? */
+ error (EXIT_FAILURE, 0, "unexpected return value from barrier wait");
+ }
+ }
+
+ if (pthread_equal (self, last_serial_thread))
+ {
+ flockfile (stdout);
+ printf ("%04d: last serial thread %lu terminating process\n",
+ ++linecount, (unsigned long) self);
+ funlockfile (stdout);
+ }
+
+ pthread_exit(NULL);
+}