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/* 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.
 */

#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;
}

extern void wake_q_add(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 */

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Name Type Size Permission Actions
autogroup.h File 1.2 KB 0644
clock.h File 2.45 KB 0644
coredump.h File 2.75 KB 0644
cpufreq.h File 887 B 0644
cputime.h File 5.13 KB 0644
deadline.h File 597 B 0644
debug.h File 1.41 KB 0644
hotplug.h File 578 B 0644
idle.h File 1.77 KB 0644
init.h File 240 B 0644
isolation.h File 1.33 KB 0644
jobctl.h File 1.46 KB 0644
loadavg.h File 1.17 KB 0644
mm.h File 7.63 KB 0644
nohz.h File 1.22 KB 0644
numa_balancing.h File 1.26 KB 0644
prio.h File 1.71 KB 0644
rt.h File 1.41 KB 0644
signal.h File 17.79 KB 0644
smt.h File 415 B 0644
stat.h File 1.02 KB 0644
sysctl.h File 2.5 KB 0644
task.h File 3.9 KB 0644
task_stack.h File 3.03 KB 0644
topology.h File 6.18 KB 0644
user.h File 1.7 KB 0644
wake_q.h File 1.79 KB 0644
xacct.h File 854 B 0644