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authorUlrich Drepper <drepper@redhat.com>2000-05-28 22:14:55 +0000
committerUlrich Drepper <drepper@redhat.com>2000-05-28 22:14:55 +0000
commitc0f3519d2e841dbaad086091f610cebc8178e7f6 (patch)
tree8ca703fea57ed1eefb8f5f102e2c166f5a1f912d /linuxthreads/Examples
parent2588068bdf891c057443ecfee136fb1bcfc3bf38 (diff)
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Update.
* posix/Makefile (tests): Add tst-fork.
Diffstat (limited to 'linuxthreads/Examples')
-rw-r--r--linuxthreads/Examples/ex8.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/linuxthreads/Examples/ex8.c b/linuxthreads/Examples/ex8.c
new file mode 100644
index 0000000..89ad8ae
--- /dev/null
+++ b/linuxthreads/Examples/ex8.c
@@ -0,0 +1,101 @@
+/* Tests for fork in multi-threaded environment.
+ Copyright (C) 2000 Free Software Foundation, Inc.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library 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 <stdlib.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <wait.h>
+
+enum
+{
+ PREPARE_BIT = 1,
+ PARENT_BIT = 2,
+ CHILD_BIT = 4
+};
+
+static int var;
+
+static void
+prepare (void)
+{
+ var |= PREPARE_BIT;
+}
+
+static void
+parent (void)
+{
+ var |= PARENT_BIT;
+}
+
+static void
+child (void)
+{
+ var |= CHILD_BIT;
+}
+
+
+static void *thread (void *arg);
+
+
+int
+main (void)
+{
+ pthread_t th;
+ void *res;
+
+ pthread_atfork (prepare, parent, child);
+
+ if (pthread_create (&th, NULL, thread, NULL) != 0)
+ error (EXIT_FAILURE, 0, "cannot create thread");
+
+ pthread_join (th, &res);
+
+ return (int) res;
+}
+
+
+static void *
+thread (void *arg)
+{
+ int status;
+ pid_t pid;
+
+ pid = fork ();
+ if (pid == 0)
+ {
+ /* We check whether the `prepare' and `child' function ran. */
+ exit (var != (PREPARE_BIT | CHILD_BIT));
+ }
+ else if (pid == (pid_t) -1)
+ error (EXIT_FAILURE, errno, "cannot fork");
+
+ if (waitpid (pid, &status, 0) != pid)
+ error (EXIT_FAILURE, errno, "wrong child");
+
+ if (WTERMSIG (status) != 0)
+ error (EXIT_FAILURE, 0, "Child terminated incorrectly");
+ status = WEXITSTATUS (status);
+
+ if (status == 0)
+ status = var != (PREPARE_BIT | PARENT_BIT);
+
+ return (void *) status;
+}