From ff5e7e9cb2daae34a89ee51569e253ae4890752e Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Wed, 1 Jun 2016 13:12:47 -0400
Subject: run it

---
 src/libbasic/async.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 src/libbasic/async.c

(limited to 'src/libbasic/async.c')

diff --git a/src/libbasic/async.c b/src/libbasic/async.c
new file mode 100644
index 0000000000..a1f163f27b
--- /dev/null
+++ b/src/libbasic/async.c
@@ -0,0 +1,94 @@
+/***
+  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 <errno.h>
+#include <pthread.h>
+#include <stddef.h>
+#include <unistd.h>
+
+#include "async.h"
+#include "fd-util.h"
+#include "log.h"
+#include "macro.h"
+#include "util.h"
+
+int asynchronous_job(void* (*func)(void *p), void *arg) {
+        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)
+                goto finish;
+
+        r = pthread_create(&t, &a, func, arg);
+
+finish:
+        pthread_attr_destroy(&a);
+        return -r;
+}
+
+static void *sync_thread(void *p) {
+        sync();
+        return NULL;
+}
+
+int asynchronous_sync(void) {
+        log_debug("Spawning new thread for sync");
+
+        return asynchronous_job(sync_thread, NULL);
+}
+
+static void *close_thread(void *p) {
+        assert_se(close_nointr(PTR_TO_FD(p)) != -EBADF);
+        return NULL;
+}
+
+int asynchronous_close(int fd) {
+        int r;
+
+        /* This is supposed to behave similar to safe_close(), but
+         * actually invoke close() asynchronously, so that it will
+         * never block. Ideally the kernel would have an API for this,
+         * but it doesn't, so we work around it, and hide this as a
+         * far away as we can. */
+
+        if (fd >= 0) {
+                PROTECT_ERRNO;
+
+                r = asynchronous_job(close_thread, FD_TO_PTR(fd));
+                if (r < 0)
+                         assert_se(close_nointr(fd) != -EBADF);
+        }
+
+        return -1;
+}
-- 
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