Move c_src dirs back to toplevel

[bcachefs-tools-debian] / include / linux / kthread.h

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
new file mode 100644 (file)
index 0000000..3a8cf10
--- /dev/null
+++ b/include/linux/kthread.h
@@ -0,0 +1,118 @@
+#ifndef _LINUX_KTHREAD_H
+#define _LINUX_KTHREAD_H
+
+/* Simple interface for creating and stopping kernel threads without mess. */
+#include <linux/err.h>
+#include <linux/lockdep.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+
+__printf(3, 4)
+struct task_struct *kthread_create(int (*threadfn)(void *data),
+                                  void *data,
+                                  const char namefmt[], ...);
+
+
+struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data),
+                                         void *data,
+                                         unsigned int cpu,
+                                         const char *namefmt);
+
+/**
+ * kthread_run - create and wake a thread.
+ * @threadfn: the function to run until signal_pending(current).
+ * @data: data ptr for @threadfn.
+ * @namefmt: printf-style name for the thread.
+ *
+ * Description: Convenient wrapper for kthread_create() followed by
+ * wake_up_process().  Returns the kthread or ERR_PTR(-ENOMEM).
+ */
+#define kthread_run(threadfn, data, namefmt, ...)                         \
+({                                                                        \
+       struct task_struct *__k                                            \
+               = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
+       if (!IS_ERR(__k))                                                  \
+               wake_up_process(__k);                                      \
+       __k;                                                               \
+})
+
+int kthread_stop(struct task_struct *k);
+bool kthread_should_stop(void);
+bool kthread_should_park(void);
+bool kthread_freezable_should_stop(bool *was_frozen);
+void *kthread_data(struct task_struct *k);
+void *probe_kthread_data(struct task_struct *k);
+int kthread_park(struct task_struct *k);
+void kthread_unpark(struct task_struct *k);
+void kthread_parkme(void);
+
+int kthreadd(void *unused);
+extern struct task_struct *kthreadd_task;
+extern int tsk_fork_get_node(struct task_struct *tsk);
+
+/*
+ * Simple work processor based on kthread.
+ *
+ * This provides easier way to make use of kthreads.  A kthread_work
+ * can be queued and flushed using queue/flush_kthread_work()
+ * respectively.  Queued kthread_works are processed by a kthread
+ * running kthread_worker_fn().
+ */
+struct kthread_work;
+typedef void (*kthread_work_func_t)(struct kthread_work *work);
+
+struct kthread_worker {
+       spinlock_t              lock;
+       struct list_head        work_list;
+       struct task_struct      *task;
+       struct kthread_work     *current_work;
+};
+
+struct kthread_work {
+       struct list_head        node;
+       kthread_work_func_t     func;
+       struct kthread_worker   *worker;
+};
+
+#define KTHREAD_WORKER_INIT(worker)    {                               \
+       .lock = __SPIN_LOCK_UNLOCKED((worker).lock),                    \
+       .work_list = LIST_HEAD_INIT((worker).work_list),                \
+       }
+
+#define KTHREAD_WORK_INIT(work, fn)    {                               \
+       .node = LIST_HEAD_INIT((work).node),                            \
+       .func = (fn),                                                   \
+       }
+
+#define DEFINE_KTHREAD_WORKER(worker)                                  \
+       struct kthread_worker worker = KTHREAD_WORKER_INIT(worker)
+
+#define DEFINE_KTHREAD_WORK(work, fn)                                  \
+       struct kthread_work work = KTHREAD_WORK_INIT(work, fn)
+
+#define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker)
+
+extern void __init_kthread_worker(struct kthread_worker *worker,
+                       const char *name, struct lock_class_key *key);
+
+#define init_kthread_worker(worker)                                    \
+       do {                                                            \
+               static struct lock_class_key __key;                     \
+               __init_kthread_worker((worker), "("#worker")->lock", &__key); \
+       } while (0)
+
+#define init_kthread_work(work, fn)                                    \
+       do {                                                            \
+               memset((work), 0, sizeof(struct kthread_work));         \
+               INIT_LIST_HEAD(&(work)->node);                          \
+               (work)->func = (fn);                                    \
+       } while (0)
+
+int kthread_worker_fn(void *worker_ptr);
+
+bool queue_kthread_work(struct kthread_worker *worker,
+                       struct kthread_work *work);
+void flush_kthread_work(struct kthread_work *work);
+void flush_kthread_worker(struct kthread_worker *worker);
+
+#endif /* _LINUX_KTHREAD_H */