#include <linux/timer.h>
#include <linux/linkage.h>
#include <linux/bitops.h>
+#include <asm/atomic.h>
struct workqueue_struct;
+struct work_struct;
+typedef void (*work_func_t)(struct work_struct *work);
+
+/*
+ * The first word is the work queue pointer and the flags rolled into
+ * one
+ */
+#define work_data_bits(work) ((unsigned long *)(&(work)->data))
+
struct work_struct {
- unsigned long pending;
+ atomic_long_t data;
+#define WORK_STRUCT_PENDING 0 /* T if work item pending execution */
+#define WORK_STRUCT_NOAUTOREL 1 /* F if work item automatically released on exec */
+#define WORK_STRUCT_FLAG_MASK (3UL)
+#define WORK_STRUCT_WQ_DATA_MASK (~WORK_STRUCT_FLAG_MASK)
struct list_head entry;
- void (*func)(void *);
- void *data;
- void *wq_data;
+ work_func_t func;
+};
+
+#define WORK_DATA_INIT(autorelease) \
+ ATOMIC_LONG_INIT((autorelease) << WORK_STRUCT_NOAUTOREL)
+
+struct delayed_work {
+ struct work_struct work;
struct timer_list timer;
};
-#define __WORK_INITIALIZER(n, f, d) { \
+struct execute_work {
+ struct work_struct work;
+};
+
+#define __WORK_INITIALIZER(n, f) { \
+ .data = WORK_DATA_INIT(0), \
.entry = { &(n).entry, &(n).entry }, \
.func = (f), \
- .data = (d), \
+ }
+
+#define __WORK_INITIALIZER_NAR(n, f) { \
+ .data = WORK_DATA_INIT(1), \
+ .entry = { &(n).entry, &(n).entry }, \
+ .func = (f), \
+ }
+
+#define __DELAYED_WORK_INITIALIZER(n, f) { \
+ .work = __WORK_INITIALIZER((n).work, (f)), \
.timer = TIMER_INITIALIZER(NULL, 0, 0), \
}
-#define DECLARE_WORK(n, f, d) \
- struct work_struct n = __WORK_INITIALIZER(n, f, d)
+#define __DELAYED_WORK_INITIALIZER_NAR(n, f) { \
+ .work = __WORK_INITIALIZER_NAR((n).work, (f)), \
+ .timer = TIMER_INITIALIZER(NULL, 0, 0), \
+ }
+
+#define DECLARE_WORK(n, f) \
+ struct work_struct n = __WORK_INITIALIZER(n, f)
+
+#define DECLARE_WORK_NAR(n, f) \
+ struct work_struct n = __WORK_INITIALIZER_NAR(n, f)
+
+#define DECLARE_DELAYED_WORK(n, f) \
+ struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f)
+
+#define DECLARE_DELAYED_WORK_NAR(n, f) \
+ struct dwork_struct n = __DELAYED_WORK_INITIALIZER_NAR(n, f)
/*
- * initialize a work-struct's func and data pointers:
+ * initialize a work item's function pointer
*/
-#define PREPARE_WORK(_work, _func, _data) \
+#define PREPARE_WORK(_work, _func) \
do { \
- (_work)->func = _func; \
- (_work)->data = _data; \
+ (_work)->func = (_func); \
} while (0)
+#define PREPARE_DELAYED_WORK(_work, _func) \
+ PREPARE_WORK(&(_work)->work, (_func))
+
/*
- * initialize all of a work-struct:
+ * initialize all of a work item in one go
+ *
+ * NOTE! No point in using "atomic_long_set()": useing a direct
+ * assignment of the work data initializer allows the compiler
+ * to generate better code.
*/
-#define INIT_WORK(_work, _func, _data) \
+#define INIT_WORK(_work, _func) \
do { \
+ (_work)->data = (atomic_long_t) WORK_DATA_INIT(0); \
INIT_LIST_HEAD(&(_work)->entry); \
- (_work)->pending = 0; \
- PREPARE_WORK((_work), (_func), (_data)); \
+ PREPARE_WORK((_work), (_func)); \
+ } while (0)
+
+#define INIT_WORK_NAR(_work, _func) \
+ do { \
+ (_work)->data = (atomic_long_t) WORK_DATA_INIT(1); \
+ INIT_LIST_HEAD(&(_work)->entry); \
+ PREPARE_WORK((_work), (_func)); \
+ } while (0)
+
+#define INIT_DELAYED_WORK(_work, _func) \
+ do { \
+ INIT_WORK(&(_work)->work, (_func)); \
+ init_timer(&(_work)->timer); \
+ } while (0)
+
+#define INIT_DELAYED_WORK_NAR(_work, _func) \
+ do { \
+ INIT_WORK_NAR(&(_work)->work, (_func)); \
init_timer(&(_work)->timer); \
} while (0)
+/**
+ * work_pending - Find out whether a work item is currently pending
+ * @work: The work item in question
+ */
+#define work_pending(work) \
+ test_bit(WORK_STRUCT_PENDING, work_data_bits(work))
+
+/**
+ * delayed_work_pending - Find out whether a delayable work item is currently
+ * pending
+ * @work: The work item in question
+ */
+#define delayed_work_pending(w) \
+ work_pending(&(w)->work)
+
+/**
+ * work_release - Release a work item under execution
+ * @work: The work item to release
+ *
+ * This is used to release a work item that has been initialised with automatic
+ * release mode disabled (WORK_STRUCT_NOAUTOREL is set). This gives the work
+ * function the opportunity to grab auxiliary data from the container of the
+ * work_struct before clearing the pending bit as the work_struct may be
+ * subject to deallocation the moment the pending bit is cleared.
+ *
+ * In such a case, this should be called in the work function after it has
+ * fetched any data it may require from the containter of the work_struct.
+ * After this function has been called, the work_struct may be scheduled for
+ * further execution or it may be deallocated unless other precautions are
+ * taken.
+ *
+ * This should also be used to release a delayed work item.
+ */
+#define work_release(work) \
+ clear_bit(WORK_STRUCT_PENDING, work_data_bits(work))
+
+
extern struct workqueue_struct *__create_workqueue(const char *name,
- int singlethread);
-#define create_workqueue(name) __create_workqueue((name), 0)
-#define create_singlethread_workqueue(name) __create_workqueue((name), 1)
+ int singlethread,
+ int freezeable);
+#define create_workqueue(name) __create_workqueue((name), 0, 0)
+#define create_freezeable_workqueue(name) __create_workqueue((name), 0, 1)
+#define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0)
extern void destroy_workqueue(struct workqueue_struct *wq);
extern int FASTCALL(queue_work(struct workqueue_struct *wq, struct work_struct *work));
-extern int FASTCALL(queue_delayed_work(struct workqueue_struct *wq, struct work_struct *work, unsigned long delay));
+extern int FASTCALL(queue_delayed_work(struct workqueue_struct *wq, struct delayed_work *work, unsigned long delay));
+extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
+ struct delayed_work *work, unsigned long delay);
extern void FASTCALL(flush_workqueue(struct workqueue_struct *wq));
extern int FASTCALL(schedule_work(struct work_struct *work));
-extern int FASTCALL(schedule_delayed_work(struct work_struct *work, unsigned long delay));
+extern int FASTCALL(run_scheduled_work(struct work_struct *work));
+extern int FASTCALL(schedule_delayed_work(struct delayed_work *work, unsigned long delay));
-extern int schedule_delayed_work_on(int cpu, struct work_struct *work, unsigned long delay);
-extern int schedule_on_each_cpu(void (*func)(void *info), void *info);
+extern int schedule_delayed_work_on(int cpu, struct delayed_work *work, unsigned long delay);
+extern int schedule_on_each_cpu(work_func_t func);
extern void flush_scheduled_work(void);
extern int current_is_keventd(void);
extern int keventd_up(void);
extern void init_workqueues(void);
-void cancel_rearming_delayed_work(struct work_struct *work);
+void cancel_rearming_delayed_work(struct delayed_work *work);
void cancel_rearming_delayed_workqueue(struct workqueue_struct *,
- struct work_struct *);
+ struct delayed_work *);
+int execute_in_process_context(work_func_t fn, struct execute_work *);
/*
* Kill off a pending schedule_delayed_work(). Note that the work callback
* function may still be running on return from cancel_delayed_work(). Run
* flush_scheduled_work() to wait on it.
*/
-static inline int cancel_delayed_work(struct work_struct *work)
+static inline int cancel_delayed_work(struct delayed_work *work)
{
int ret;
ret = del_timer_sync(&work->timer);
if (ret)
- clear_bit(0, &work->pending);
+ work_release(&work->work);
return ret;
}
git://git.onelab.eu / linux-2.6.git / blobdiff