test: fork handling

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 9b7839bc3310c84995b72df3054c450d689dbcdd..1b50c32290853673ca34efcc32d6469f0fabaaf6 100644 (file)
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -15,7 +15,8 @@ noinst_PROGRAMS = test_urcu test_urcu_dynamic_link test_urcu_timing \
         test_urcu_bp test_urcu_bp_dynamic_link test_cycles_per_loop \
        test_urcu_lfq test_urcu_wfq test_urcu_lfs test_urcu_wfs \
        test_urcu_wfq_dynlink test_urcu_wfs_dynlink \
-       test_urcu_lfq_dynlink test_urcu_lfs_dynlink
+       test_urcu_lfq_dynlink test_urcu_lfs_dynlink \
+       test_urcu_fork
 noinst_HEADERS = rcutorture.h
 
 if COMPAT_ARCH
@@ -80,6 +81,7 @@ test_urcu_signal_timing_CFLAGS= -DRCU_SIGNAL $(AM_CFLAGS)
 test_urcu_signal_yield_SOURCES = test_urcu.c $(URCU_SIGNAL)
 test_urcu_signal_yield_CFLAGS = -DRCU_SIGNAL -DDEBUG_YIELD $(AM_CFLAGS)
 
+test_urcu_fork_SOURCES = test_urcu_fork.c $(URCU)
 
 test_rwlock_timing_SOURCES = test_rwlock_timing.c $(URCU_SIGNAL)
 

diff --git a/tests/test_urcu_fork.c b/tests/test_urcu_fork.c
new file mode 100644 (file)
index 0000000..6e454b5
--- /dev/null
+++ b/tests/test_urcu_fork.c
@@ -0,0 +1,147 @@
+/*
+ * test_urcu_fork.c
+ *
+ * Userspace RCU library - test program (fork)
+ *
+ * Copyright February 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define _GNU_SOURCE
+#include "../config.h"
+#include <stdio.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <assert.h>
+#include <sched.h>
+#include <errno.h>
+
+#include <urcu/arch.h>
+#include <urcu/tls-compat.h>
+
+#ifndef DYNAMIC_LINK_TEST
+#define _LGPL_SOURCE
+#else
+#define rcu_debug_yield_read()
+#endif
+#include <urcu.h>
+
+struct test_node {
+       int somedata;
+       struct rcu_head head;
+};
+
+static void cb(struct rcu_head *head)
+{
+       struct test_node *node;
+
+       fprintf(stderr, "rcu callback invoked in pid: %d\n",
+               (int) getpid());
+       node = caa_container_of(head, struct test_node, head);
+       free(node);
+}
+
+static void test_rcu(void)
+{
+       struct test_node *node;
+
+       rcu_register_thread();
+
+       synchronize_rcu();
+
+       rcu_read_lock();
+       rcu_read_unlock();
+
+       node = malloc(sizeof(*node));
+       assert(node);
+
+       call_rcu(&node->head, cb);
+
+       synchronize_rcu();
+
+       rcu_unregister_thread();
+}
+
+int main(int argc, char **argv)
+{
+       pid_t pid;
+       int ret;
+
+#if 0
+       /* pthread_atfork does not work with malloc/free in callbacks */
+       ret = pthread_atfork(call_rcu_before_fork,
+               call_rcu_after_fork_parent,
+               call_rcu_after_fork_child);
+       if (ret) {
+               errno = ret;
+               perror("pthread_atfork");
+               exit(EXIT_FAILURE);
+       }
+#endif
+
+       test_rcu();
+
+       synchronize_rcu();
+
+       fprintf(stderr, "%s parent pid: %d, before fork\n",
+               argv[0], (int) getpid());
+
+       call_rcu_before_fork();
+       pid = fork();
+
+       if (pid == 0) {
+               /* child */
+               call_rcu_after_fork_child();
+               fprintf(stderr, "%s child pid: %d, after fork\n",
+                       argv[0], (int) getpid());
+               test_rcu();
+               fprintf(stderr, "%s child pid: %d, after rcu test\n",
+                       argv[0], (int) getpid());
+       } else if (pid > 0) {
+               int status;
+
+               /* parent */
+               call_rcu_after_fork_parent();
+               fprintf(stderr, "%s parent pid: %d, after fork\n",
+                       argv[0], (int) getpid());
+               test_rcu();
+               fprintf(stderr, "%s parent pid: %d, after rcu test\n",
+                       argv[0], (int) getpid());
+               for (;;) {
+                       pid = wait(&status);
+                       if (WIFEXITED(status)) {
+                               fprintf(stderr, "child %u exited normally with status %u\n",
+                                       pid, WEXITSTATUS(status));
+                               break;
+                       } else if (WIFSIGNALED(status)) {
+                               fprintf(stderr, "child %u was terminated by signal %u\n",
+                                       pid, WTERMSIG(status));
+                               break;
+                       } else {
+                               continue;
+                       }
+               }
+       } else {
+               perror("fork");
+               exit(EXIT_FAILURE);
+       }
+       exit(EXIT_SUCCESS);
+}