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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_RCUWAIT_H_#define _LINUX_RCUWAIT_H_
#include <linux/rcupdate.h>#include <linux/sched/signal.h>#include <linux/types.h>
#define __RCUWAIT_INITIALIZER(name) \ { .task = NULL, }
static inline void rcuwait_init(struct rcuwait *w){ w->task = NULL;}
/* * Note: this provides no serialization and, just as with waitqueues, * requires care to estimate as to whether or not the wait is active. */static inline int rcuwait_active(struct rcuwait *w){ return !!rcu_access_pointer(w->task);}
extern int rcuwait_wake_up(struct rcuwait *w);
/* * The caller is responsible for locking around rcuwait_wait_event(), * and [prepare_to/finish]_rcuwait() such that writes to @task are * properly serialized. */
static inline void prepare_to_rcuwait(struct rcuwait *w){ rcu_assign_pointer(w->task, current);}
extern void finish_rcuwait(struct rcuwait *w);
#define ___rcuwait_wait_event(w, condition, state, ret, cmd) \({ \ long __ret = ret; \ prepare_to_rcuwait(w); \ for (;;) { \ /* \ * Implicit barrier (A) pairs with (B) in \ * rcuwait_wake_up(). \ */ \ set_current_state(state); \ if (condition) \ break; \ \ if (signal_pending_state(state, current)) { \ __ret = -EINTR; \ break; \ } \ \ cmd; \ } \ finish_rcuwait(w); \ __ret; \})
#define rcuwait_wait_event(w, condition, state) \ ___rcuwait_wait_event(w, condition, state, 0, schedule())
#define __rcuwait_wait_event_timeout(w, condition, state, timeout) \ ___rcuwait_wait_event(w, ___wait_cond_timeout(condition), \ state, timeout, \ __ret = schedule_timeout(__ret))
#define rcuwait_wait_event_timeout(w, condition, state, timeout) \({ \ long __ret = timeout; \ if (!___wait_cond_timeout(condition)) \ __ret = __rcuwait_wait_event_timeout(w, condition, \ state, timeout); \ __ret; \})
#endif /* _LINUX_RCUWAIT_H_ */