1222 lines
43 KiB
C
1222 lines
43 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#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>
|
|
|
|
#include <asm/current.h>
|
|
#include <uapi/linux/wait.h>
|
|
|
|
typedef struct wait_queue_entry wait_queue_entry_t;
|
|
|
|
typedef int (*wait_queue_func_t)(struct wait_queue_entry *wq_entry, unsigned mode, int flags, void *key);
|
|
int default_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int flags, void *key);
|
|
|
|
/* wait_queue_entry::flags */
|
|
#define WQ_FLAG_EXCLUSIVE 0x01
|
|
#define WQ_FLAG_WOKEN 0x02
|
|
#define WQ_FLAG_BOOKMARK 0x04
|
|
#define WQ_FLAG_CUSTOM 0x08
|
|
#define WQ_FLAG_DONE 0x10
|
|
#define WQ_FLAG_PRIORITY 0x20
|
|
|
|
/*
|
|
* A single wait-queue entry structure:
|
|
*/
|
|
struct wait_queue_entry {
|
|
unsigned int flags;
|
|
void *private;
|
|
wait_queue_func_t func;
|
|
struct list_head entry;
|
|
};
|
|
|
|
struct wait_queue_head {
|
|
spinlock_t lock;
|
|
struct list_head head;
|
|
};
|
|
typedef struct wait_queue_head wait_queue_head_t;
|
|
|
|
struct task_struct;
|
|
|
|
/*
|
|
* Macros for declaration and initialisaton of the datatypes
|
|
*/
|
|
|
|
#define __WAITQUEUE_INITIALIZER(name, tsk) { \
|
|
.private = tsk, \
|
|
.func = default_wake_function, \
|
|
.entry = { NULL, NULL } }
|
|
|
|
#define DECLARE_WAITQUEUE(name, tsk) \
|
|
struct wait_queue_entry name = __WAITQUEUE_INITIALIZER(name, tsk)
|
|
|
|
#define __WAIT_QUEUE_HEAD_INITIALIZER(name) { \
|
|
.lock = __SPIN_LOCK_UNLOCKED(name.lock), \
|
|
.head = LIST_HEAD_INIT(name.head) }
|
|
|
|
#define DECLARE_WAIT_QUEUE_HEAD(name) \
|
|
struct wait_queue_head name = __WAIT_QUEUE_HEAD_INITIALIZER(name)
|
|
|
|
extern void __init_waitqueue_head(struct wait_queue_head *wq_head, const char *name, struct lock_class_key *);
|
|
|
|
#define init_waitqueue_head(wq_head) \
|
|
do { \
|
|
static struct lock_class_key __key; \
|
|
\
|
|
__init_waitqueue_head((wq_head), #wq_head, &__key); \
|
|
} while (0)
|
|
|
|
#ifdef CONFIG_LOCKDEP
|
|
# define __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) \
|
|
({ init_waitqueue_head(&name); name; })
|
|
# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) \
|
|
struct wait_queue_head name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name)
|
|
#else
|
|
# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) DECLARE_WAIT_QUEUE_HEAD(name)
|
|
#endif
|
|
|
|
static inline void init_waitqueue_entry(struct wait_queue_entry *wq_entry, struct task_struct *p)
|
|
{
|
|
wq_entry->flags = 0;
|
|
wq_entry->private = p;
|
|
wq_entry->func = default_wake_function;
|
|
}
|
|
|
|
static inline void
|
|
init_waitqueue_func_entry(struct wait_queue_entry *wq_entry, wait_queue_func_t func)
|
|
{
|
|
wq_entry->flags = 0;
|
|
wq_entry->private = NULL;
|
|
wq_entry->func = func;
|
|
}
|
|
|
|
/**
|
|
* waitqueue_active -- locklessly test for waiters on the queue
|
|
* @wq_head: the waitqueue to test for waiters
|
|
*
|
|
* returns true if the wait list is not empty
|
|
*
|
|
* NOTE: this function is lockless and requires care, incorrect usage _will_
|
|
* lead to sporadic and non-obvious failure.
|
|
*
|
|
* Use either while holding wait_queue_head::lock or when used for wakeups
|
|
* with an extra smp_mb() like::
|
|
*
|
|
* CPU0 - waker CPU1 - waiter
|
|
*
|
|
* for (;;) {
|
|
* @cond = true; prepare_to_wait(&wq_head, &wait, state);
|
|
* smp_mb(); // smp_mb() from set_current_state()
|
|
* if (waitqueue_active(wq_head)) if (@cond)
|
|
* wake_up(wq_head); break;
|
|
* schedule();
|
|
* }
|
|
* finish_wait(&wq_head, &wait);
|
|
*
|
|
* Because without the explicit smp_mb() it's possible for the
|
|
* waitqueue_active() load to get hoisted over the @cond store such that we'll
|
|
* observe an empty wait list while the waiter might not observe @cond.
|
|
*
|
|
* Also note that this 'optimization' trades a spin_lock() for an smp_mb(),
|
|
* which (when the lock is uncontended) are of roughly equal cost.
|
|
*/
|
|
static inline int waitqueue_active(struct wait_queue_head *wq_head)
|
|
{
|
|
return !list_empty(&wq_head->head);
|
|
}
|
|
|
|
/**
|
|
* wq_has_single_sleeper - check if there is only one sleeper
|
|
* @wq_head: wait queue head
|
|
*
|
|
* Returns true of wq_head has only one sleeper on the list.
|
|
*
|
|
* Please refer to the comment for waitqueue_active.
|
|
*/
|
|
static inline bool wq_has_single_sleeper(struct wait_queue_head *wq_head)
|
|
{
|
|
return list_is_singular(&wq_head->head);
|
|
}
|
|
|
|
/**
|
|
* wq_has_sleeper - check if there are any waiting processes
|
|
* @wq_head: wait queue head
|
|
*
|
|
* Returns true if wq_head has waiting processes
|
|
*
|
|
* Please refer to the comment for waitqueue_active.
|
|
*/
|
|
static inline bool wq_has_sleeper(struct wait_queue_head *wq_head)
|
|
{
|
|
/*
|
|
* We need to be sure we are in sync with the
|
|
* add_wait_queue modifications to the wait queue.
|
|
*
|
|
* This memory barrier should be paired with one on the
|
|
* waiting side.
|
|
*/
|
|
smp_mb();
|
|
return waitqueue_active(wq_head);
|
|
}
|
|
|
|
extern void add_wait_queue(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry);
|
|
extern void add_wait_queue_exclusive(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry);
|
|
extern void add_wait_queue_priority(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry);
|
|
extern void remove_wait_queue(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry);
|
|
|
|
static inline void __add_wait_queue(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry)
|
|
{
|
|
struct list_head *head = &wq_head->head;
|
|
struct wait_queue_entry *wq;
|
|
|
|
list_for_each_entry(wq, &wq_head->head, entry) {
|
|
if (!(wq->flags & WQ_FLAG_PRIORITY))
|
|
break;
|
|
head = &wq->entry;
|
|
}
|
|
list_add(&wq_entry->entry, head);
|
|
}
|
|
|
|
/*
|
|
* Used for wake-one threads:
|
|
*/
|
|
static inline void
|
|
__add_wait_queue_exclusive(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry)
|
|
{
|
|
wq_entry->flags |= WQ_FLAG_EXCLUSIVE;
|
|
__add_wait_queue(wq_head, wq_entry);
|
|
}
|
|
|
|
static inline void __add_wait_queue_entry_tail(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry)
|
|
{
|
|
list_add_tail(&wq_entry->entry, &wq_head->head);
|
|
}
|
|
|
|
static inline void
|
|
__add_wait_queue_entry_tail_exclusive(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry)
|
|
{
|
|
wq_entry->flags |= WQ_FLAG_EXCLUSIVE;
|
|
__add_wait_queue_entry_tail(wq_head, wq_entry);
|
|
}
|
|
|
|
static inline void
|
|
__remove_wait_queue(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry)
|
|
{
|
|
list_del(&wq_entry->entry);
|
|
}
|
|
|
|
int __wake_up(struct wait_queue_head *wq_head, unsigned int mode, int nr, void *key);
|
|
void __wake_up_locked_key(struct wait_queue_head *wq_head, unsigned int mode, void *key);
|
|
void __wake_up_locked_key_bookmark(struct wait_queue_head *wq_head,
|
|
unsigned int mode, void *key, wait_queue_entry_t *bookmark);
|
|
void __wake_up_sync_key(struct wait_queue_head *wq_head, unsigned int mode, void *key);
|
|
void __wake_up_locked_sync_key(struct wait_queue_head *wq_head, unsigned int mode, void *key);
|
|
void __wake_up_locked(struct wait_queue_head *wq_head, unsigned int mode, int nr);
|
|
void __wake_up_sync(struct wait_queue_head *wq_head, unsigned int mode);
|
|
void __wake_up_pollfree(struct wait_queue_head *wq_head);
|
|
|
|
#define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL)
|
|
#define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL)
|
|
#define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL)
|
|
#define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL, 1)
|
|
#define wake_up_all_locked(x) __wake_up_locked((x), TASK_NORMAL, 0)
|
|
|
|
#define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL)
|
|
#define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL)
|
|
#define wake_up_interruptible_all(x) __wake_up(x, TASK_INTERRUPTIBLE, 0, NULL)
|
|
#define wake_up_interruptible_sync(x) __wake_up_sync((x), TASK_INTERRUPTIBLE)
|
|
|
|
/*
|
|
* Wakeup macros to be used to report events to the targets.
|
|
*/
|
|
#define poll_to_key(m) ((void *)(__force uintptr_t)(__poll_t)(m))
|
|
#define key_to_poll(m) ((__force __poll_t)(uintptr_t)(void *)(m))
|
|
#define wake_up_poll(x, m) \
|
|
__wake_up(x, TASK_NORMAL, 1, poll_to_key(m))
|
|
#define wake_up_locked_poll(x, m) \
|
|
__wake_up_locked_key((x), TASK_NORMAL, poll_to_key(m))
|
|
#define wake_up_interruptible_poll(x, m) \
|
|
__wake_up(x, TASK_INTERRUPTIBLE, 1, poll_to_key(m))
|
|
#define wake_up_interruptible_sync_poll(x, m) \
|
|
__wake_up_sync_key((x), TASK_INTERRUPTIBLE, poll_to_key(m))
|
|
#define wake_up_interruptible_sync_poll_locked(x, m) \
|
|
__wake_up_locked_sync_key((x), TASK_INTERRUPTIBLE, poll_to_key(m))
|
|
|
|
/**
|
|
* wake_up_pollfree - signal that a polled waitqueue is going away
|
|
* @wq_head: the wait queue head
|
|
*
|
|
* In the very rare cases where a ->poll() implementation uses a waitqueue whose
|
|
* lifetime is tied to a task rather than to the 'struct file' being polled,
|
|
* this function must be called before the waitqueue is freed so that
|
|
* non-blocking polls (e.g. epoll) are notified that the queue is going away.
|
|
*
|
|
* The caller must also RCU-delay the freeing of the wait_queue_head, e.g. via
|
|
* an explicit synchronize_rcu() or call_rcu(), or via SLAB_TYPESAFE_BY_RCU.
|
|
*/
|
|
static inline void wake_up_pollfree(struct wait_queue_head *wq_head)
|
|
{
|
|
/*
|
|
* For performance reasons, we don't always take the queue lock here.
|
|
* Therefore, we might race with someone removing the last entry from
|
|
* the queue, and proceed while they still hold the queue lock.
|
|
* However, rcu_read_lock() is required to be held in such cases, so we
|
|
* can safely proceed with an RCU-delayed free.
|
|
*/
|
|
if (waitqueue_active(wq_head))
|
|
__wake_up_pollfree(wq_head);
|
|
}
|
|
|
|
#define ___wait_cond_timeout(condition) \
|
|
({ \
|
|
bool __cond = (condition); \
|
|
if (__cond && !__ret) \
|
|
__ret = 1; \
|
|
__cond || !__ret; \
|
|
})
|
|
|
|
#define ___wait_is_interruptible(state) \
|
|
(!__builtin_constant_p(state) || \
|
|
(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
|
|
|
|
extern void init_wait_entry(struct wait_queue_entry *wq_entry, int flags);
|
|
|
|
/*
|
|
* The below macro ___wait_event() has an explicit shadow of the __ret
|
|
* variable when used from the wait_event_*() macros.
|
|
*
|
|
* This is so that both can use the ___wait_cond_timeout() construct
|
|
* to wrap the condition.
|
|
*
|
|
* The type inconsistency of the wait_event_*() __ret variable is also
|
|
* on purpose; we use long where we can return timeout values and int
|
|
* otherwise.
|
|
*/
|
|
|
|
#define ___wait_event(wq_head, condition, state, exclusive, ret, cmd) \
|
|
({ \
|
|
__label__ __out; \
|
|
struct wait_queue_entry __wq_entry; \
|
|
long __ret = ret; /* explicit shadow */ \
|
|
\
|
|
init_wait_entry(&__wq_entry, exclusive ? WQ_FLAG_EXCLUSIVE : 0); \
|
|
for (;;) { \
|
|
long __int = prepare_to_wait_event(&wq_head, &__wq_entry, state);\
|
|
\
|
|
if (condition) \
|
|
break; \
|
|
\
|
|
if (___wait_is_interruptible(state) && __int) { \
|
|
__ret = __int; \
|
|
goto __out; \
|
|
} \
|
|
\
|
|
cmd; \
|
|
} \
|
|
finish_wait(&wq_head, &__wq_entry); \
|
|
__out: __ret; \
|
|
})
|
|
|
|
#define __wait_event(wq_head, condition) \
|
|
(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
|
|
schedule())
|
|
|
|
/**
|
|
* wait_event - sleep until a condition gets true
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
*
|
|
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
|
|
* @condition evaluates to true. The @condition is checked each time
|
|
* the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*/
|
|
#define wait_event(wq_head, condition) \
|
|
do { \
|
|
might_sleep(); \
|
|
if (condition) \
|
|
break; \
|
|
__wait_event(wq_head, condition); \
|
|
} while (0)
|
|
|
|
#define __io_wait_event(wq_head, condition) \
|
|
(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
|
|
io_schedule())
|
|
|
|
/*
|
|
* io_wait_event() -- like wait_event() but with io_schedule()
|
|
*/
|
|
#define io_wait_event(wq_head, condition) \
|
|
do { \
|
|
might_sleep(); \
|
|
if (condition) \
|
|
break; \
|
|
__io_wait_event(wq_head, condition); \
|
|
} while (0)
|
|
|
|
#define __wait_event_freezable(wq_head, condition) \
|
|
___wait_event(wq_head, condition, (TASK_INTERRUPTIBLE|TASK_FREEZABLE), \
|
|
0, 0, schedule())
|
|
|
|
/**
|
|
* wait_event_freezable - sleep (or freeze) until a condition gets true
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE -- so as not to contribute
|
|
* to system load) until the @condition evaluates to true. The
|
|
* @condition is checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*/
|
|
#define wait_event_freezable(wq_head, condition) \
|
|
({ \
|
|
int __ret = 0; \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_freezable(wq_head, condition); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_timeout(wq_head, condition, timeout) \
|
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \
|
|
TASK_UNINTERRUPTIBLE, 0, timeout, \
|
|
__ret = schedule_timeout(__ret))
|
|
|
|
/**
|
|
* wait_event_timeout - sleep until a condition gets true or a timeout elapses
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
* @timeout: timeout, in jiffies
|
|
*
|
|
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
|
|
* @condition evaluates to true. The @condition is checked each time
|
|
* the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* Returns:
|
|
* 0 if the @condition evaluated to %false after the @timeout elapsed,
|
|
* 1 if the @condition evaluated to %true after the @timeout elapsed,
|
|
* or the remaining jiffies (at least 1) if the @condition evaluated
|
|
* to %true before the @timeout elapsed.
|
|
*/
|
|
#define wait_event_timeout(wq_head, condition, timeout) \
|
|
({ \
|
|
long __ret = timeout; \
|
|
might_sleep(); \
|
|
if (!___wait_cond_timeout(condition)) \
|
|
__ret = __wait_event_timeout(wq_head, condition, timeout); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_freezable_timeout(wq_head, condition, timeout) \
|
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \
|
|
(TASK_INTERRUPTIBLE|TASK_FREEZABLE), 0, timeout, \
|
|
__ret = schedule_timeout(__ret))
|
|
|
|
/*
|
|
* like wait_event_timeout() -- except it uses TASK_INTERRUPTIBLE to avoid
|
|
* increasing load and is freezable.
|
|
*/
|
|
#define wait_event_freezable_timeout(wq_head, condition, timeout) \
|
|
({ \
|
|
long __ret = timeout; \
|
|
might_sleep(); \
|
|
if (!___wait_cond_timeout(condition)) \
|
|
__ret = __wait_event_freezable_timeout(wq_head, condition, timeout); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_exclusive_cmd(wq_head, condition, cmd1, cmd2) \
|
|
(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 1, 0, \
|
|
cmd1; schedule(); cmd2)
|
|
/*
|
|
* Just like wait_event_cmd(), except it sets exclusive flag
|
|
*/
|
|
#define wait_event_exclusive_cmd(wq_head, condition, cmd1, cmd2) \
|
|
do { \
|
|
if (condition) \
|
|
break; \
|
|
__wait_event_exclusive_cmd(wq_head, condition, cmd1, cmd2); \
|
|
} while (0)
|
|
|
|
#define __wait_event_cmd(wq_head, condition, cmd1, cmd2) \
|
|
(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
|
|
cmd1; schedule(); cmd2)
|
|
|
|
/**
|
|
* wait_event_cmd - sleep until a condition gets true
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
* @cmd1: the command will be executed before sleep
|
|
* @cmd2: the command will be executed after sleep
|
|
*
|
|
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
|
|
* @condition evaluates to true. The @condition is checked each time
|
|
* the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*/
|
|
#define wait_event_cmd(wq_head, condition, cmd1, cmd2) \
|
|
do { \
|
|
if (condition) \
|
|
break; \
|
|
__wait_event_cmd(wq_head, condition, cmd1, cmd2); \
|
|
} while (0)
|
|
|
|
#define __wait_event_interruptible(wq_head, condition) \
|
|
___wait_event(wq_head, condition, TASK_INTERRUPTIBLE, 0, 0, \
|
|
schedule())
|
|
|
|
/**
|
|
* wait_event_interruptible - sleep until a condition gets true
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
|
|
* @condition evaluates to true or a signal is received.
|
|
* The @condition is checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* The function will return -ERESTARTSYS if it was interrupted by a
|
|
* signal and 0 if @condition evaluated to true.
|
|
*/
|
|
#define wait_event_interruptible(wq_head, condition) \
|
|
({ \
|
|
int __ret = 0; \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_interruptible(wq_head, condition); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_interruptible_timeout(wq_head, condition, timeout) \
|
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \
|
|
TASK_INTERRUPTIBLE, 0, timeout, \
|
|
__ret = schedule_timeout(__ret))
|
|
|
|
/**
|
|
* wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
* @timeout: timeout, in jiffies
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
|
|
* @condition evaluates to true or a signal is received.
|
|
* The @condition is checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* Returns:
|
|
* 0 if the @condition evaluated to %false after the @timeout elapsed,
|
|
* 1 if the @condition evaluated to %true after the @timeout elapsed,
|
|
* the remaining jiffies (at least 1) if the @condition evaluated
|
|
* to %true before the @timeout elapsed, or -%ERESTARTSYS if it was
|
|
* interrupted by a signal.
|
|
*/
|
|
#define wait_event_interruptible_timeout(wq_head, condition, timeout) \
|
|
({ \
|
|
long __ret = timeout; \
|
|
might_sleep(); \
|
|
if (!___wait_cond_timeout(condition)) \
|
|
__ret = __wait_event_interruptible_timeout(wq_head, \
|
|
condition, timeout); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_hrtimeout(wq_head, condition, timeout, state) \
|
|
({ \
|
|
int __ret = 0; \
|
|
struct hrtimer_sleeper __t; \
|
|
\
|
|
hrtimer_init_sleeper_on_stack(&__t, CLOCK_MONOTONIC, \
|
|
HRTIMER_MODE_REL); \
|
|
if ((timeout) != KTIME_MAX) { \
|
|
hrtimer_set_expires_range_ns(&__t.timer, timeout, \
|
|
current->timer_slack_ns); \
|
|
hrtimer_sleeper_start_expires(&__t, HRTIMER_MODE_REL); \
|
|
} \
|
|
\
|
|
__ret = ___wait_event(wq_head, condition, state, 0, 0, \
|
|
if (!__t.task) { \
|
|
__ret = -ETIME; \
|
|
break; \
|
|
} \
|
|
schedule()); \
|
|
\
|
|
hrtimer_cancel(&__t.timer); \
|
|
destroy_hrtimer_on_stack(&__t.timer); \
|
|
__ret; \
|
|
})
|
|
|
|
/**
|
|
* wait_event_hrtimeout - sleep until a condition gets true or a timeout elapses
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
* @timeout: timeout, as a ktime_t
|
|
*
|
|
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
|
|
* @condition evaluates to true or a signal is received.
|
|
* The @condition is checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* The function returns 0 if @condition became true, or -ETIME if the timeout
|
|
* elapsed.
|
|
*/
|
|
#define wait_event_hrtimeout(wq_head, condition, timeout) \
|
|
({ \
|
|
int __ret = 0; \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_hrtimeout(wq_head, condition, timeout, \
|
|
TASK_UNINTERRUPTIBLE); \
|
|
__ret; \
|
|
})
|
|
|
|
/**
|
|
* wait_event_interruptible_hrtimeout - sleep until a condition gets true or a timeout elapses
|
|
* @wq: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
* @timeout: timeout, as a ktime_t
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
|
|
* @condition evaluates to true or a signal is received.
|
|
* The @condition is checked each time the waitqueue @wq is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* The function returns 0 if @condition became true, -ERESTARTSYS if it was
|
|
* interrupted by a signal, or -ETIME if the timeout elapsed.
|
|
*/
|
|
#define wait_event_interruptible_hrtimeout(wq, condition, timeout) \
|
|
({ \
|
|
long __ret = 0; \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_hrtimeout(wq, condition, timeout, \
|
|
TASK_INTERRUPTIBLE); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_interruptible_exclusive(wq, condition) \
|
|
___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, 0, \
|
|
schedule())
|
|
|
|
#define wait_event_interruptible_exclusive(wq, condition) \
|
|
({ \
|
|
int __ret = 0; \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_interruptible_exclusive(wq, condition); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_killable_exclusive(wq, condition) \
|
|
___wait_event(wq, condition, TASK_KILLABLE, 1, 0, \
|
|
schedule())
|
|
|
|
#define wait_event_killable_exclusive(wq, condition) \
|
|
({ \
|
|
int __ret = 0; \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_killable_exclusive(wq, condition); \
|
|
__ret; \
|
|
})
|
|
|
|
|
|
#define __wait_event_freezable_exclusive(wq, condition) \
|
|
___wait_event(wq, condition, (TASK_INTERRUPTIBLE|TASK_FREEZABLE), 1, 0,\
|
|
schedule())
|
|
|
|
#define wait_event_freezable_exclusive(wq, condition) \
|
|
({ \
|
|
int __ret = 0; \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_freezable_exclusive(wq, condition); \
|
|
__ret; \
|
|
})
|
|
|
|
/**
|
|
* wait_event_idle - wait for a condition without contributing to system load
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
*
|
|
* The process is put to sleep (TASK_IDLE) until the
|
|
* @condition evaluates to true.
|
|
* The @condition is checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
*/
|
|
#define wait_event_idle(wq_head, condition) \
|
|
do { \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
___wait_event(wq_head, condition, TASK_IDLE, 0, 0, schedule()); \
|
|
} while (0)
|
|
|
|
/**
|
|
* wait_event_idle_exclusive - wait for a condition with contributing to system load
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
*
|
|
* The process is put to sleep (TASK_IDLE) until the
|
|
* @condition evaluates to true.
|
|
* The @condition is checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
|
|
* set thus if other processes wait on the same list, when this
|
|
* process is woken further processes are not considered.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
*/
|
|
#define wait_event_idle_exclusive(wq_head, condition) \
|
|
do { \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
___wait_event(wq_head, condition, TASK_IDLE, 1, 0, schedule()); \
|
|
} while (0)
|
|
|
|
#define __wait_event_idle_timeout(wq_head, condition, timeout) \
|
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \
|
|
TASK_IDLE, 0, timeout, \
|
|
__ret = schedule_timeout(__ret))
|
|
|
|
/**
|
|
* wait_event_idle_timeout - sleep without load until a condition becomes true or a timeout elapses
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
* @timeout: timeout, in jiffies
|
|
*
|
|
* The process is put to sleep (TASK_IDLE) until the
|
|
* @condition evaluates to true. The @condition is checked each time
|
|
* the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* Returns:
|
|
* 0 if the @condition evaluated to %false after the @timeout elapsed,
|
|
* 1 if the @condition evaluated to %true after the @timeout elapsed,
|
|
* or the remaining jiffies (at least 1) if the @condition evaluated
|
|
* to %true before the @timeout elapsed.
|
|
*/
|
|
#define wait_event_idle_timeout(wq_head, condition, timeout) \
|
|
({ \
|
|
long __ret = timeout; \
|
|
might_sleep(); \
|
|
if (!___wait_cond_timeout(condition)) \
|
|
__ret = __wait_event_idle_timeout(wq_head, condition, timeout); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_idle_exclusive_timeout(wq_head, condition, timeout) \
|
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \
|
|
TASK_IDLE, 1, timeout, \
|
|
__ret = schedule_timeout(__ret))
|
|
|
|
/**
|
|
* wait_event_idle_exclusive_timeout - sleep without load until a condition becomes true or a timeout elapses
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
* @timeout: timeout, in jiffies
|
|
*
|
|
* The process is put to sleep (TASK_IDLE) until the
|
|
* @condition evaluates to true. The @condition is checked each time
|
|
* the waitqueue @wq_head is woken up.
|
|
*
|
|
* The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
|
|
* set thus if other processes wait on the same list, when this
|
|
* process is woken further processes are not considered.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* Returns:
|
|
* 0 if the @condition evaluated to %false after the @timeout elapsed,
|
|
* 1 if the @condition evaluated to %true after the @timeout elapsed,
|
|
* or the remaining jiffies (at least 1) if the @condition evaluated
|
|
* to %true before the @timeout elapsed.
|
|
*/
|
|
#define wait_event_idle_exclusive_timeout(wq_head, condition, timeout) \
|
|
({ \
|
|
long __ret = timeout; \
|
|
might_sleep(); \
|
|
if (!___wait_cond_timeout(condition)) \
|
|
__ret = __wait_event_idle_exclusive_timeout(wq_head, condition, timeout);\
|
|
__ret; \
|
|
})
|
|
|
|
extern int do_wait_intr(wait_queue_head_t *, wait_queue_entry_t *);
|
|
extern int do_wait_intr_irq(wait_queue_head_t *, wait_queue_entry_t *);
|
|
|
|
#define __wait_event_interruptible_locked(wq, condition, exclusive, fn) \
|
|
({ \
|
|
int __ret; \
|
|
DEFINE_WAIT(__wait); \
|
|
if (exclusive) \
|
|
__wait.flags |= WQ_FLAG_EXCLUSIVE; \
|
|
do { \
|
|
__ret = fn(&(wq), &__wait); \
|
|
if (__ret) \
|
|
break; \
|
|
} while (!(condition)); \
|
|
__remove_wait_queue(&(wq), &__wait); \
|
|
__set_current_state(TASK_RUNNING); \
|
|
__ret; \
|
|
})
|
|
|
|
|
|
/**
|
|
* wait_event_interruptible_locked - sleep until a condition gets true
|
|
* @wq: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
|
|
* @condition evaluates to true or a signal is received.
|
|
* The @condition is checked each time the waitqueue @wq is woken up.
|
|
*
|
|
* It must be called with wq.lock being held. This spinlock is
|
|
* unlocked while sleeping but @condition testing is done while lock
|
|
* is held and when this macro exits the lock is held.
|
|
*
|
|
* The lock is locked/unlocked using spin_lock()/spin_unlock()
|
|
* functions which must match the way they are locked/unlocked outside
|
|
* of this macro.
|
|
*
|
|
* wake_up_locked() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* The function will return -ERESTARTSYS if it was interrupted by a
|
|
* signal and 0 if @condition evaluated to true.
|
|
*/
|
|
#define wait_event_interruptible_locked(wq, condition) \
|
|
((condition) \
|
|
? 0 : __wait_event_interruptible_locked(wq, condition, 0, do_wait_intr))
|
|
|
|
/**
|
|
* wait_event_interruptible_locked_irq - sleep until a condition gets true
|
|
* @wq: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
|
|
* @condition evaluates to true or a signal is received.
|
|
* The @condition is checked each time the waitqueue @wq is woken up.
|
|
*
|
|
* It must be called with wq.lock being held. This spinlock is
|
|
* unlocked while sleeping but @condition testing is done while lock
|
|
* is held and when this macro exits the lock is held.
|
|
*
|
|
* The lock is locked/unlocked using spin_lock_irq()/spin_unlock_irq()
|
|
* functions which must match the way they are locked/unlocked outside
|
|
* of this macro.
|
|
*
|
|
* wake_up_locked() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* The function will return -ERESTARTSYS if it was interrupted by a
|
|
* signal and 0 if @condition evaluated to true.
|
|
*/
|
|
#define wait_event_interruptible_locked_irq(wq, condition) \
|
|
((condition) \
|
|
? 0 : __wait_event_interruptible_locked(wq, condition, 0, do_wait_intr_irq))
|
|
|
|
/**
|
|
* wait_event_interruptible_exclusive_locked - sleep exclusively until a condition gets true
|
|
* @wq: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
|
|
* @condition evaluates to true or a signal is received.
|
|
* The @condition is checked each time the waitqueue @wq is woken up.
|
|
*
|
|
* It must be called with wq.lock being held. This spinlock is
|
|
* unlocked while sleeping but @condition testing is done while lock
|
|
* is held and when this macro exits the lock is held.
|
|
*
|
|
* The lock is locked/unlocked using spin_lock()/spin_unlock()
|
|
* functions which must match the way they are locked/unlocked outside
|
|
* of this macro.
|
|
*
|
|
* The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
|
|
* set thus when other process waits process on the list if this
|
|
* process is awaken further processes are not considered.
|
|
*
|
|
* wake_up_locked() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* The function will return -ERESTARTSYS if it was interrupted by a
|
|
* signal and 0 if @condition evaluated to true.
|
|
*/
|
|
#define wait_event_interruptible_exclusive_locked(wq, condition) \
|
|
((condition) \
|
|
? 0 : __wait_event_interruptible_locked(wq, condition, 1, do_wait_intr))
|
|
|
|
/**
|
|
* wait_event_interruptible_exclusive_locked_irq - sleep until a condition gets true
|
|
* @wq: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
|
|
* @condition evaluates to true or a signal is received.
|
|
* The @condition is checked each time the waitqueue @wq is woken up.
|
|
*
|
|
* It must be called with wq.lock being held. This spinlock is
|
|
* unlocked while sleeping but @condition testing is done while lock
|
|
* is held and when this macro exits the lock is held.
|
|
*
|
|
* The lock is locked/unlocked using spin_lock_irq()/spin_unlock_irq()
|
|
* functions which must match the way they are locked/unlocked outside
|
|
* of this macro.
|
|
*
|
|
* The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
|
|
* set thus when other process waits process on the list if this
|
|
* process is awaken further processes are not considered.
|
|
*
|
|
* wake_up_locked() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* The function will return -ERESTARTSYS if it was interrupted by a
|
|
* signal and 0 if @condition evaluated to true.
|
|
*/
|
|
#define wait_event_interruptible_exclusive_locked_irq(wq, condition) \
|
|
((condition) \
|
|
? 0 : __wait_event_interruptible_locked(wq, condition, 1, do_wait_intr_irq))
|
|
|
|
|
|
#define __wait_event_killable(wq, condition) \
|
|
___wait_event(wq, condition, TASK_KILLABLE, 0, 0, schedule())
|
|
|
|
/**
|
|
* wait_event_killable - sleep until a condition gets true
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
*
|
|
* The process is put to sleep (TASK_KILLABLE) until the
|
|
* @condition evaluates to true or a signal is received.
|
|
* The @condition is checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* The function will return -ERESTARTSYS if it was interrupted by a
|
|
* signal and 0 if @condition evaluated to true.
|
|
*/
|
|
#define wait_event_killable(wq_head, condition) \
|
|
({ \
|
|
int __ret = 0; \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_killable(wq_head, condition); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_state(wq, condition, state) \
|
|
___wait_event(wq, condition, state, 0, 0, schedule())
|
|
|
|
/**
|
|
* wait_event_state - sleep until a condition gets true
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
* @state: state to sleep in
|
|
*
|
|
* The process is put to sleep (@state) until the @condition evaluates to true
|
|
* or a signal is received (when allowed by @state). The @condition is checked
|
|
* each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* The function will return -ERESTARTSYS if it was interrupted by a signal
|
|
* (when allowed by @state) and 0 if @condition evaluated to true.
|
|
*/
|
|
#define wait_event_state(wq_head, condition, state) \
|
|
({ \
|
|
int __ret = 0; \
|
|
might_sleep(); \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_state(wq_head, condition, state); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_killable_timeout(wq_head, condition, timeout) \
|
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \
|
|
TASK_KILLABLE, 0, timeout, \
|
|
__ret = schedule_timeout(__ret))
|
|
|
|
/**
|
|
* wait_event_killable_timeout - sleep until a condition gets true or a timeout elapses
|
|
* @wq_head: the waitqueue to wait on
|
|
* @condition: a C expression for the event to wait for
|
|
* @timeout: timeout, in jiffies
|
|
*
|
|
* The process is put to sleep (TASK_KILLABLE) until the
|
|
* @condition evaluates to true or a kill signal is received.
|
|
* The @condition is checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* Returns:
|
|
* 0 if the @condition evaluated to %false after the @timeout elapsed,
|
|
* 1 if the @condition evaluated to %true after the @timeout elapsed,
|
|
* the remaining jiffies (at least 1) if the @condition evaluated
|
|
* to %true before the @timeout elapsed, or -%ERESTARTSYS if it was
|
|
* interrupted by a kill signal.
|
|
*
|
|
* Only kill signals interrupt this process.
|
|
*/
|
|
#define wait_event_killable_timeout(wq_head, condition, timeout) \
|
|
({ \
|
|
long __ret = timeout; \
|
|
might_sleep(); \
|
|
if (!___wait_cond_timeout(condition)) \
|
|
__ret = __wait_event_killable_timeout(wq_head, \
|
|
condition, timeout); \
|
|
__ret; \
|
|
})
|
|
|
|
|
|
#define __wait_event_lock_irq(wq_head, condition, lock, cmd) \
|
|
(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
|
|
spin_unlock_irq(&lock); \
|
|
cmd; \
|
|
schedule(); \
|
|
spin_lock_irq(&lock))
|
|
|
|
/**
|
|
* wait_event_lock_irq_cmd - sleep until a condition gets true. The
|
|
* condition is checked under the lock. This
|
|
* is expected to be called with the lock
|
|
* taken.
|
|
* @wq_head: 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 cmd
|
|
* and schedule() and reacquired afterwards.
|
|
* @cmd: a command which is invoked outside the critical section before
|
|
* sleep
|
|
*
|
|
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
|
|
* @condition evaluates to true. The @condition is checked each time
|
|
* the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* This is supposed to be called while holding the lock. The lock is
|
|
* dropped before invoking the cmd and going to sleep and is reacquired
|
|
* afterwards.
|
|
*/
|
|
#define wait_event_lock_irq_cmd(wq_head, condition, lock, cmd) \
|
|
do { \
|
|
if (condition) \
|
|
break; \
|
|
__wait_event_lock_irq(wq_head, condition, lock, cmd); \
|
|
} while (0)
|
|
|
|
/**
|
|
* wait_event_lock_irq - sleep until a condition gets true. The
|
|
* condition is checked under the lock. This
|
|
* is expected to be called with the lock
|
|
* taken.
|
|
* @wq_head: 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()
|
|
* and reacquired afterwards.
|
|
*
|
|
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
|
|
* @condition evaluates to true. The @condition is checked each time
|
|
* the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* This is supposed to be called while holding the lock. The lock is
|
|
* dropped before going to sleep and is reacquired afterwards.
|
|
*/
|
|
#define wait_event_lock_irq(wq_head, condition, lock) \
|
|
do { \
|
|
if (condition) \
|
|
break; \
|
|
__wait_event_lock_irq(wq_head, condition, lock, ); \
|
|
} while (0)
|
|
|
|
|
|
#define __wait_event_interruptible_lock_irq(wq_head, condition, lock, cmd) \
|
|
___wait_event(wq_head, condition, TASK_INTERRUPTIBLE, 0, 0, \
|
|
spin_unlock_irq(&lock); \
|
|
cmd; \
|
|
schedule(); \
|
|
spin_lock_irq(&lock))
|
|
|
|
/**
|
|
* wait_event_interruptible_lock_irq_cmd - sleep until a condition gets true.
|
|
* The condition is checked under the lock. This is expected to
|
|
* be called with the lock taken.
|
|
* @wq_head: 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 cmd and
|
|
* schedule() and reacquired afterwards.
|
|
* @cmd: a command which is invoked outside the critical section before
|
|
* sleep
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
|
|
* @condition evaluates to true or a signal is received. The @condition is
|
|
* checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* This is supposed to be called while holding the lock. The lock is
|
|
* dropped before invoking the cmd and going to sleep and is reacquired
|
|
* afterwards.
|
|
*
|
|
* The macro will return -ERESTARTSYS if it was interrupted by a signal
|
|
* and 0 if @condition evaluated to true.
|
|
*/
|
|
#define wait_event_interruptible_lock_irq_cmd(wq_head, condition, lock, cmd) \
|
|
({ \
|
|
int __ret = 0; \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_interruptible_lock_irq(wq_head, \
|
|
condition, lock, cmd); \
|
|
__ret; \
|
|
})
|
|
|
|
/**
|
|
* wait_event_interruptible_lock_irq - sleep until a condition gets true.
|
|
* The condition is checked under the lock. This is expected
|
|
* to be called with the lock taken.
|
|
* @wq_head: 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()
|
|
* and reacquired afterwards.
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
|
|
* @condition evaluates to true or signal is received. The @condition is
|
|
* checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* This is supposed to be called while holding the lock. The lock is
|
|
* dropped before going to sleep and is reacquired afterwards.
|
|
*
|
|
* The macro will return -ERESTARTSYS if it was interrupted by a signal
|
|
* and 0 if @condition evaluated to true.
|
|
*/
|
|
#define wait_event_interruptible_lock_irq(wq_head, condition, lock) \
|
|
({ \
|
|
int __ret = 0; \
|
|
if (!(condition)) \
|
|
__ret = __wait_event_interruptible_lock_irq(wq_head, \
|
|
condition, lock,); \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_lock_irq_timeout(wq_head, condition, lock, timeout, state) \
|
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \
|
|
state, 0, timeout, \
|
|
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.
|
|
* @wq_head: 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()
|
|
* and reacquired afterwards.
|
|
* @timeout: timeout, in jiffies
|
|
*
|
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
|
|
* @condition evaluates to true or signal is received. The @condition is
|
|
* checked each time the waitqueue @wq_head is woken up.
|
|
*
|
|
* wake_up() has to be called after changing any variable that could
|
|
* change the result of the wait condition.
|
|
*
|
|
* This is supposed to be called while holding the lock. The lock is
|
|
* dropped before going to sleep and is reacquired afterwards.
|
|
*
|
|
* The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it
|
|
* was interrupted by a signal, and the remaining jiffies otherwise
|
|
* if the condition evaluated to true before the timeout elapsed.
|
|
*/
|
|
#define wait_event_interruptible_lock_irq_timeout(wq_head, condition, lock, \
|
|
timeout) \
|
|
({ \
|
|
long __ret = timeout; \
|
|
if (!___wait_cond_timeout(condition)) \
|
|
__ret = __wait_event_lock_irq_timeout( \
|
|
wq_head, condition, lock, timeout, \
|
|
TASK_INTERRUPTIBLE); \
|
|
__ret; \
|
|
})
|
|
|
|
#define wait_event_lock_irq_timeout(wq_head, condition, lock, timeout) \
|
|
({ \
|
|
long __ret = timeout; \
|
|
if (!___wait_cond_timeout(condition)) \
|
|
__ret = __wait_event_lock_irq_timeout( \
|
|
wq_head, condition, lock, timeout, \
|
|
TASK_UNINTERRUPTIBLE); \
|
|
__ret; \
|
|
})
|
|
|
|
/*
|
|
* Waitqueues which are removed from the waitqueue_head at wakeup time
|
|
*/
|
|
void prepare_to_wait(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry, int state);
|
|
bool prepare_to_wait_exclusive(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry, int state);
|
|
long prepare_to_wait_event(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry, int state);
|
|
void finish_wait(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry);
|
|
long wait_woken(struct wait_queue_entry *wq_entry, unsigned mode, long timeout);
|
|
int woken_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key);
|
|
int autoremove_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key);
|
|
|
|
#define DEFINE_WAIT_FUNC(name, function) \
|
|
struct wait_queue_entry name = { \
|
|
.private = current, \
|
|
.func = function, \
|
|
.entry = LIST_HEAD_INIT((name).entry), \
|
|
}
|
|
|
|
#define DEFINE_WAIT(name) DEFINE_WAIT_FUNC(name, autoremove_wake_function)
|
|
|
|
#define init_wait(wait) \
|
|
do { \
|
|
(wait)->private = current; \
|
|
(wait)->func = autoremove_wake_function; \
|
|
INIT_LIST_HEAD(&(wait)->entry); \
|
|
(wait)->flags = 0; \
|
|
} while (0)
|
|
|
|
typedef int (*task_call_f)(struct task_struct *p, void *arg);
|
|
extern int task_call_func(struct task_struct *p, task_call_f func, void *arg);
|
|
|
|
#endif /* _LINUX_WAIT_H */
|