https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 1048ba83fb1c00cd24172e23e8263972f6b5d9ac authored by Linus Torvalds on 31 January 2021, 21:50:09 UTC
Linux 5.11-rc6
Linux 5.11-rc6
Tip revision: 1048ba8
wake_q.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SCHED_WAKE_Q_H
#define _LINUX_SCHED_WAKE_Q_H
/*
* Wake-queues are lists of tasks with a pending wakeup, whose
* callers have already marked the task as woken internally,
* and can thus carry on. A common use case is being able to
* do the wakeups once the corresponding user lock as been
* released.
*
* We hold reference to each task in the list across the wakeup,
* thus guaranteeing that the memory is still valid by the time
* the actual wakeups are performed in wake_up_q().
*
* One per task suffices, because there's never a need for a task to be
* in two wake queues simultaneously; it is forbidden to abandon a task
* in a wake queue (a call to wake_up_q() _must_ follow), so if a task is
* already in a wake queue, the wakeup will happen soon and the second
* waker can just skip it.
*
* The DEFINE_WAKE_Q macro declares and initializes the list head.
* wake_up_q() does NOT reinitialize the list; it's expected to be
* called near the end of a function. Otherwise, the list can be
* re-initialized for later re-use by wake_q_init().
*
* NOTE that this can cause spurious wakeups. schedule() callers
* must ensure the call is done inside a loop, confirming that the
* wakeup condition has in fact occurred.
*
* NOTE that there is no guarantee the wakeup will happen any later than the
* wake_q_add() location. Therefore task must be ready to be woken at the
* location of the wake_q_add().
*/
#include <linux/sched.h>
struct wake_q_head {
struct wake_q_node *first;
struct wake_q_node **lastp;
};
#define WAKE_Q_TAIL ((struct wake_q_node *) 0x01)
#define DEFINE_WAKE_Q(name) \
struct wake_q_head name = { WAKE_Q_TAIL, &name.first }
static inline void wake_q_init(struct wake_q_head *head)
{
head->first = WAKE_Q_TAIL;
head->lastp = &head->first;
}
static inline bool wake_q_empty(struct wake_q_head *head)
{
return head->first == WAKE_Q_TAIL;
}
extern void wake_q_add(struct wake_q_head *head, struct task_struct *task);
extern void wake_q_add_safe(struct wake_q_head *head, struct task_struct *task);
extern void wake_up_q(struct wake_q_head *head);
#endif /* _LINUX_SCHED_WAKE_Q_H */