d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
bca7902961
freebsd-dev/sys/sys/event.h
Suleiman Souhlal 571dcd15e2 Fix the recent panics/LORs/hangs created by my kqueue commit by: 
- Introducing the possibility of using locks different than mutexes
for the knlist locking. In order to do this, we add three arguments to
knlist_init() to specify the functions to use to lock, unlock and
check if the lock is owned. If these arguments are NULL, we assume
mtx_lock, mtx_unlock and mtx_owned, respectively.

- Using the vnode lock for the knlist locking, when doing kqueue operations
on a vnode. This way, we don't have to lock the vnode while holding a
mutex, in filt_vfsread.

Reviewed by:	jmg
Approved by:	re (scottl), scottl (mentor override)
Pointyhat to:	ssouhlal
Will be happy:	everyone
2005-07-01 16:28:32 +00:00

246 lines
8.2 KiB
C
Raw Blame History

/*-
* Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _SYS_EVENT_H_
#define _SYS_EVENT_H_
#define EVFILT_READ (-1)
#define EVFILT_WRITE (-2)
#define EVFILT_AIO (-3) /* attached to aio requests */
#define EVFILT_VNODE (-4) /* attached to vnodes */
#define EVFILT_PROC (-5) /* attached to struct proc */
#define EVFILT_SIGNAL (-6) /* attached to struct proc */
#define EVFILT_TIMER (-7) /* timers */
#define EVFILT_NETDEV (-8) /* network devices */
#define EVFILT_FS (-9) /* filesystem events */
#define EVFILT_SYSCOUNT 9
#define EV_SET(kevp_, a, b, c, d, e, f) do { \
struct kevent *kevp = (kevp_); \
(kevp)->ident = (a); \
(kevp)->filter = (b); \
(kevp)->flags = (c); \
(kevp)->fflags = (d); \
(kevp)->data = (e); \
(kevp)->udata = (f); \
} while(0)
struct kevent {
uintptr_t ident; /* identifier for this event */
short filter; /* filter for event */
u_short flags;
u_int fflags;
intptr_t data;
void *udata; /* opaque user data identifier */
};
/* actions */
#define EV_ADD 0x0001 /* add event to kq (implies enable) */
#define EV_DELETE 0x0002 /* delete event from kq */
#define EV_ENABLE 0x0004 /* enable event */
#define EV_DISABLE 0x0008 /* disable event (not reported) */
/* flags */
#define EV_ONESHOT 0x0010 /* only report one occurrence */
#define EV_CLEAR 0x0020 /* clear event state after reporting */
#define EV_SYSFLAGS 0xF000 /* reserved by system */
#define EV_FLAG1 0x2000 /* filter-specific flag */
/* returned values */
#define EV_EOF 0x8000 /* EOF detected */
#define EV_ERROR 0x4000 /* error, data contains errno */
/*
* data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
*/
#define NOTE_LOWAT 0x0001 /* low water mark */
/*
* data/hint flags for EVFILT_VNODE, shared with userspace
*/
#define NOTE_DELETE 0x0001 /* vnode was removed */
#define NOTE_WRITE 0x0002 /* data contents changed */
#define NOTE_EXTEND 0x0004 /* size increased */
#define NOTE_ATTRIB 0x0008 /* attributes changed */
#define NOTE_LINK 0x0010 /* link count changed */
#define NOTE_RENAME 0x0020 /* vnode was renamed */
#define NOTE_REVOKE 0x0040 /* vnode access was revoked */
/*
* data/hint flags for EVFILT_PROC, shared with userspace
*/
#define NOTE_EXIT 0x80000000 /* process exited */
#define NOTE_FORK 0x40000000 /* process forked */
#define NOTE_EXEC 0x20000000 /* process exec'd */
#define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
#define NOTE_PDATAMASK 0x000fffff /* mask for pid */
/* additional flags for EVFILT_PROC */
#define NOTE_TRACK 0x00000001 /* follow across forks */
#define NOTE_TRACKERR 0x00000002 /* could not track child */
#define NOTE_CHILD 0x00000004 /* am a child process */
/*
* data/hint flags for EVFILT_NETDEV, shared with userspace
*/
#define NOTE_LINKUP 0x0001 /* link is up */
#define NOTE_LINKDOWN 0x0002 /* link is down */
#define NOTE_LINKINV 0x0004 /* link state is invalid */
/*
* This is currently visible to userland to work around broken
* programs which pull in <sys/proc.h>.
*/
#include <sys/queue.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
struct knote;
SLIST_HEAD(klist, knote);
struct kqueue;
SLIST_HEAD(kqlist, kqueue);
struct knlist {
struct klist kl_list;
void (*kl_lock)(void *); /* lock function */
void (*kl_unlock)(void *);
int (*kl_locked)(void *);
void *kl_lockarg; /* argument passed to kl_lockf() */
};
#ifdef _KERNEL
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_KQUEUE);
#endif
#define KNOTE(list, hist, lock) knote(list, hist, lock)
#define KNOTE_LOCKED(list, hint) knote(list, hint, 1)
#define KNOTE_UNLOCKED(list, hint) knote(list, hint, 0)
#define KNLIST_EMPTY(list) SLIST_EMPTY(&(list)->kl_list)
/*
* Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
* shared by EVFILT_PROC (all knotes attached to p->p_klist)
*/
#define NOTE_SIGNAL 0x08000000
struct filterops {
int f_isfd; /* true if ident == filedescriptor */
int (*f_attach)(struct knote *kn);
void (*f_detach)(struct knote *kn);
int (*f_event)(struct knote *kn, long hint);
};
/*
* Setting the KN_INFLUX flag enables you to unlock the kq that this knote
* is on, and modify kn_status as if you had the KQ lock.
*
* kn_sfflags, kn_sdata, and kn_kevent are protected by the knlist lock.
*/
struct knote {
SLIST_ENTRY(knote) kn_link; /* for kq */
SLIST_ENTRY(knote) kn_selnext; /* for struct selinfo */
struct knlist *kn_knlist; /* f_attach populated */
TAILQ_ENTRY(knote) kn_tqe;
struct kqueue *kn_kq; /* which queue we are on */
struct kevent kn_kevent;
int kn_status; /* protected by kq lock */
#define KN_ACTIVE 0x01 /* event has been triggered */
#define KN_QUEUED 0x02 /* event is on queue */
#define KN_DISABLED 0x04 /* event is disabled */
#define KN_DETACHED 0x08 /* knote is detached */
#define KN_INFLUX 0x10 /* knote is in flux */
#define KN_MARKER 0x20 /* ignore this knote */
#define KN_KQUEUE 0x40 /* this knote belongs to a kq */
#define KN_HASKQLOCK 0x80 /* for _inevent */
int kn_sfflags; /* saved filter flags */
intptr_t kn_sdata; /* saved data field */
union {
struct file *p_fp; /* file data pointer */
struct proc *p_proc; /* proc pointer */
} kn_ptr;
struct filterops *kn_fop;
void *kn_hook;
#define kn_id kn_kevent.ident
#define kn_filter kn_kevent.filter
#define kn_flags kn_kevent.flags
#define kn_fflags kn_kevent.fflags
#define kn_data kn_kevent.data
#define kn_fp kn_ptr.p_fp
};
struct kevent_copyops {
void *arg;
int (*k_copyout)(void *arg, struct kevent *kevp, int count);
int (*k_copyin)(void *arg, struct kevent *kevp, int count);
};
struct thread;
struct proc;
struct knlist;
extern void knote(struct knlist *list, long hint, int islocked);
extern void knlist_add(struct knlist *knl, struct knote *kn, int islocked);
extern void knlist_remove(struct knlist *knl, struct knote *kn, int islocked);
extern void knlist_remove_inevent(struct knlist *knl, struct knote *kn);
extern int knlist_empty(struct knlist *knl);
extern void knlist_init(struct knlist *knl, void *lock,
void (*kl_lock)(void *), void (*kl_unlock)(void *),
int (*kl_locked)(void *));
extern void knlist_destroy(struct knlist *knl);
extern void knlist_cleardel(struct knlist *knl, struct thread *td,
int islocked, int killkn);
#define knlist_clear(knl, islocked) \
knlist_cleardel((knl), NULL, (islocked), 0)
#define knlist_delete(knl, td, islocked) \
knlist_cleardel((knl), (td), (islocked), 1)
extern void knote_fdclose(struct thread *p, int fd);
extern int kqueue_register(struct kqueue *kq,
struct kevent *kev, struct thread *p, int waitok);
extern int kqueue_add_filteropts(int filt, struct filterops *filtops);
extern int kqueue_del_filteropts(int filt);
#else /* !_KERNEL */
#include <sys/cdefs.h>
struct timespec;
__BEGIN_DECLS
int kqueue(void);
int kevent(int kq, struct kevent *changelist, int nchanges,
struct kevent *eventlist, int nevents,
const struct timespec *timeout);
__END_DECLS
#endif /* !_KERNEL */
#endif /* !_SYS_EVENT_H_ */
Reference in New Issue View Git Blame Copy Permalink