btrfs-progs: add task-utils

Support for monitoring progress of running tasks, based on timerfd and
pthreads.

Signed-off-by: Silvio Fricke <silvio.fricke@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 47 insertions, 0 deletions

diff --git a/task-utils.h b/task-utils.h
new file mode 100644
index 0000000..3d412dd
--- /dev/null
+++ b/task-utils.h
@@ -0,0 +1,47 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef __TASK_UTILS_H_
+#define __TASK_UTILS_H_
+
+#include <pthread.h>
+
+struct periodic_info {
+	int timer_fd;
+	unsigned long long wakeups_missed;
+};
+
+struct task_info {
+	struct periodic_info periodic;
+	pthread_t id;
+	void *private_data;
+	void *(*threadfn)(void *);
+	int (*postfn)(void *);
+};
+
+/* task life cycle */
+struct task_info *task_init(void *(*threadfn)(void *), int (*postfn)(void *),
+			    void *thread_private);
+int task_start(struct task_info *info);
+void task_stop(struct task_info *info);
+void task_deinit(struct task_info *info);
+
+/* periodic life cycle */
+int task_period_start(struct task_info *info, unsigned int period_ms);
+void task_period_wait(struct task_info *info);
+void task_period_stop(struct task_info *info);
+
+#endif