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-rw-r--r--include/linux/wait.h124
1 files changed, 60 insertions, 64 deletions
diff --git a/include/linux/wait.h b/include/linux/wait.h
index bd4bd7b479b6..a2726c7dd244 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -1,7 +1,8 @@
#ifndef _LINUX_WAIT_H
#define _LINUX_WAIT_H
-
-
+/*
+ * Linux wait queue related types and methods
+ */
#include <linux/list.h>
#include <linux/stddef.h>
#include <linux/spinlock.h>
@@ -13,27 +14,27 @@ typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, v
int default_wake_function(wait_queue_t *wait, unsigned mode, int flags, void *key);
struct __wait_queue {
- unsigned int flags;
+ unsigned int flags;
#define WQ_FLAG_EXCLUSIVE 0x01
- void *private;
- wait_queue_func_t func;
- struct list_head task_list;
+ void *private;
+ wait_queue_func_t func;
+ struct list_head task_list;
};
struct wait_bit_key {
- void *flags;
- int bit_nr;
-#define WAIT_ATOMIC_T_BIT_NR -1
+ void *flags;
+ int bit_nr;
+#define WAIT_ATOMIC_T_BIT_NR -1
};
struct wait_bit_queue {
- struct wait_bit_key key;
- wait_queue_t wait;
+ struct wait_bit_key key;
+ wait_queue_t wait;
};
struct __wait_queue_head {
- spinlock_t lock;
- struct list_head task_list;
+ spinlock_t lock;
+ struct list_head task_list;
};
typedef struct __wait_queue_head wait_queue_head_t;
@@ -84,17 +85,17 @@ extern void __init_waitqueue_head(wait_queue_head_t *q, const char *name, struct
static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p)
{
- q->flags = 0;
- q->private = p;
- q->func = default_wake_function;
+ q->flags = 0;
+ q->private = p;
+ q->func = default_wake_function;
}
-static inline void init_waitqueue_func_entry(wait_queue_t *q,
- wait_queue_func_t func)
+static inline void
+init_waitqueue_func_entry(wait_queue_t *q, wait_queue_func_t func)
{
- q->flags = 0;
- q->private = NULL;
- q->func = func;
+ q->flags = 0;
+ q->private = NULL;
+ q->func = func;
}
static inline int waitqueue_active(wait_queue_head_t *q)
@@ -114,8 +115,8 @@ static inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new)
/*
* Used for wake-one threads:
*/
-static inline void __add_wait_queue_exclusive(wait_queue_head_t *q,
- wait_queue_t *wait)
+static inline void
+__add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait)
{
wait->flags |= WQ_FLAG_EXCLUSIVE;
__add_wait_queue(q, wait);
@@ -127,23 +128,22 @@ static inline void __add_wait_queue_tail(wait_queue_head_t *head,
list_add_tail(&new->task_list, &head->task_list);
}
-static inline void __add_wait_queue_tail_exclusive(wait_queue_head_t *q,
- wait_queue_t *wait)
+static inline void
+__add_wait_queue_tail_exclusive(wait_queue_head_t *q, wait_queue_t *wait)
{
wait->flags |= WQ_FLAG_EXCLUSIVE;
__add_wait_queue_tail(q, wait);
}
-static inline void __remove_wait_queue(wait_queue_head_t *head,
- wait_queue_t *old)
+static inline void
+__remove_wait_queue(wait_queue_head_t *head, wait_queue_t *old)
{
list_del(&old->task_list);
}
void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key);
void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key);
-void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode, int nr,
- void *key);
+void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode, int nr, void *key);
void __wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr);
void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr);
void __wake_up_bit(wait_queue_head_t *, void *, int);
@@ -170,21 +170,21 @@ wait_queue_head_t *bit_waitqueue(void *, int);
/*
* Wakeup macros to be used to report events to the targets.
*/
-#define wake_up_poll(x, m) \
+#define wake_up_poll(x, m) \
__wake_up(x, TASK_NORMAL, 1, (void *) (m))
-#define wake_up_locked_poll(x, m) \
+#define wake_up_locked_poll(x, m) \
__wake_up_locked_key((x), TASK_NORMAL, (void *) (m))
-#define wake_up_interruptible_poll(x, m) \
+#define wake_up_interruptible_poll(x, m) \
__wake_up(x, TASK_INTERRUPTIBLE, 1, (void *) (m))
#define wake_up_interruptible_sync_poll(x, m) \
__wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, (void *) (m))
#define ___wait_cond_timeout(condition) \
({ \
- bool __cond = (condition); \
- if (__cond && !__ret) \
- __ret = 1; \
- __cond || !__ret; \
+ bool __cond = (condition); \
+ if (__cond && !__ret) \
+ __ret = 1; \
+ __cond || !__ret; \
})
#define ___wait_signal_pending(state) \
@@ -209,8 +209,8 @@ wait_queue_head_t *bit_waitqueue(void *, int);
if (___wait_signal_pending(state)) { \
__ret = -ERESTARTSYS; \
if (exclusive) { \
- abort_exclusive_wait(&wq, &__wait, \
- state, NULL); \
+ abort_exclusive_wait(&wq, &__wait, \
+ state, NULL); \
goto __out; \
} \
break; \
@@ -222,7 +222,7 @@ wait_queue_head_t *bit_waitqueue(void *, int);
__out: __ret; \
})
-#define __wait_event(wq, condition) \
+#define __wait_event(wq, condition) \
(void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
schedule())
@@ -238,9 +238,9 @@ __out: __ret; \
* wake_up() has to be called after changing any variable that could
* change the result of the wait condition.
*/
-#define wait_event(wq, condition) \
+#define wait_event(wq, condition) \
do { \
- if (condition) \
+ if (condition) \
break; \
__wait_event(wq, condition); \
} while (0)
@@ -270,7 +270,7 @@ do { \
#define wait_event_timeout(wq, condition, timeout) \
({ \
long __ret = timeout; \
- if (!(condition)) \
+ if (!(condition)) \
__ret = __wait_event_timeout(wq, condition, timeout); \
__ret; \
})
@@ -329,7 +329,7 @@ do { \
({ \
long __ret = timeout; \
if (!(condition)) \
- __ret = __wait_event_interruptible_timeout(wq, \
+ __ret = __wait_event_interruptible_timeout(wq, \
condition, timeout); \
__ret; \
})
@@ -569,7 +569,6 @@ do { \
? 0 : __wait_event_interruptible_locked(wq, condition, 1, 1))
-
#define __wait_event_killable(wq, condition) \
___wait_event(wq, condition, TASK_KILLABLE, 0, 0, schedule())
@@ -663,7 +662,7 @@ do { \
#define __wait_event_interruptible_lock_irq(wq, condition, lock, cmd) \
- ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
+ ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
spin_unlock_irq(&lock); \
cmd; \
schedule(); \
@@ -698,7 +697,7 @@ do { \
({ \
int __ret = 0; \
if (!(condition)) \
- __ret = __wait_event_interruptible_lock_irq(wq, \
+ __ret = __wait_event_interruptible_lock_irq(wq, \
condition, lock, cmd); \
__ret; \
})
@@ -734,18 +733,18 @@ do { \
__ret; \
})
-#define __wait_event_interruptible_lock_irq_timeout(wq, condition, \
- lock, timeout) \
+#define __wait_event_interruptible_lock_irq_timeout(wq, condition, \
+ lock, timeout) \
___wait_event(wq, ___wait_cond_timeout(condition), \
- TASK_INTERRUPTIBLE, 0, ret, \
+ TASK_INTERRUPTIBLE, 0, ret, \
spin_unlock_irq(&lock); \
__ret = schedule_timeout(__ret); \
spin_lock_irq(&lock));
/**
- * wait_event_interruptible_lock_irq_timeout - sleep until a condition gets true or a timeout elapses.
- * The condition is checked under the lock. This is expected
- * to be called with the lock taken.
+ * wait_event_interruptible_lock_irq_timeout - sleep until a condition gets
+ * true or a timeout elapses. The condition is checked under
+ * the lock. This is expected to be called with the lock taken.
* @wq: the waitqueue to wait on
* @condition: a C expression for the event to wait for
* @lock: a locked spinlock_t, which will be released before schedule()
@@ -783,11 +782,9 @@ do { \
* We plan to remove these interfaces.
*/
extern void sleep_on(wait_queue_head_t *q);
-extern long sleep_on_timeout(wait_queue_head_t *q,
- signed long timeout);
+extern long sleep_on_timeout(wait_queue_head_t *q, signed long timeout);
extern void interruptible_sleep_on(wait_queue_head_t *q);
-extern long interruptible_sleep_on_timeout(wait_queue_head_t *q,
- signed long timeout);
+extern long interruptible_sleep_on_timeout(wait_queue_head_t *q, signed long timeout);
/*
* Waitqueues which are removed from the waitqueue_head at wakeup time
@@ -795,8 +792,7 @@ extern long interruptible_sleep_on_timeout(wait_queue_head_t *q,
void prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state);
void prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state);
void finish_wait(wait_queue_head_t *q, wait_queue_t *wait);
-void abort_exclusive_wait(wait_queue_head_t *q, wait_queue_t *wait,
- unsigned int mode, void *key);
+void abort_exclusive_wait(wait_queue_head_t *q, wait_queue_t *wait, unsigned int mode, void *key);
int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
@@ -842,8 +838,8 @@ int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
* One uses wait_on_bit() where one is waiting for the bit to clear,
* but has no intention of setting it.
*/
-static inline int wait_on_bit(void *word, int bit,
- int (*action)(void *), unsigned mode)
+static inline int
+wait_on_bit(void *word, int bit, int (*action)(void *), unsigned mode)
{
if (!test_bit(bit, word))
return 0;
@@ -866,8 +862,8 @@ static inline int wait_on_bit(void *word, int bit,
* One uses wait_on_bit_lock() where one is waiting for the bit to
* clear with the intention of setting it, and when done, clearing it.
*/
-static inline int wait_on_bit_lock(void *word, int bit,
- int (*action)(void *), unsigned mode)
+static inline int
+wait_on_bit_lock(void *word, int bit, int (*action)(void *), unsigned mode)
{
if (!test_and_set_bit(bit, word))
return 0;
@@ -891,5 +887,5 @@ int wait_on_atomic_t(atomic_t *val, int (*action)(atomic_t *), unsigned mode)
return 0;
return out_of_line_wait_on_atomic_t(val, action, mode);
}
-
-#endif
+
+#endif /* _LINUX_WAIT_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 05:35:07 +0000