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authorLennart Poettering <lennart@poettering.net>2013-01-25 22:33:33 +0100
committerLennart Poettering <lennart@poettering.net>2013-02-09 02:20:42 +0100
commitc65eb8365344eeb72ee2c0b333ab54d925263b3f (patch)
treed401f8fb3fc9bd51af74e3a6ddfec571c85f6b5c /src/core/sync.c
parent97b5f608182773d7ef9ca18913085b3a3eccd943 (diff)
shutdown: issue a sync() as soon as shutdown.target is queued
Diffstat (limited to 'src/core/sync.c')
-rw-r--r--src/core/sync.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/src/core/sync.c b/src/core/sync.c
new file mode 100644
index 0000000000..7e74b63071
--- /dev/null
+++ b/src/core/sync.c
@@ -0,0 +1,65 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd 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.
+
+ systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <pthread.h>
+#include <unistd.h>
+
+#include "sync.h"
+
+static void *sync_thread(void *p) {
+ sync();
+ return NULL;
+}
+
+int asynchronous_sync(void) {
+ pthread_attr_t a;
+ pthread_t t;
+ int r;
+
+ /* It kinda sucks that we have to resort to threads to
+ * implement an asynchronous sync(), but well, such is
+ * life.
+ *
+ * Note that issuing this command right before exiting a
+ * process will cause the process to wait for the sync() to
+ * complete. This function hence is nicely asynchronous really
+ * only in long running processes. */
+
+ r = pthread_attr_init(&a);
+ if (r != 0)
+ return -r;
+
+ r = pthread_attr_setdetachstate(&a, PTHREAD_CREATE_DETACHED);
+ if (r != 0) {
+ r = -r;
+ goto finish;
+ }
+
+ r = pthread_create(&t, &a, sync_thread, NULL);
+ if (r != 0) {
+ r = -r;
+ goto finish;
+ }
+
+finish:
+ pthread_attr_destroy(&a);
+ return r;
+}