231 lines
8.0 KiB
C
231 lines
8.0 KiB
C
/*-
|
|
* Copyright (c) 1999 Michael Smith <msmith@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_EVENTHANDLER_H
|
|
#define SYS_EVENTHANDLER_H
|
|
|
|
#include <sys/lock.h>
|
|
#include <sys/ktr.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/queue.h>
|
|
|
|
struct eventhandler_entry {
|
|
TAILQ_ENTRY(eventhandler_entry) ee_link;
|
|
int ee_priority;
|
|
#define EHE_DEAD_PRIORITY (-1)
|
|
void *ee_arg;
|
|
};
|
|
|
|
struct eventhandler_list {
|
|
char *el_name;
|
|
int el_flags;
|
|
#define EHL_INITTED (1<<0)
|
|
u_int el_runcount;
|
|
struct mtx el_lock;
|
|
TAILQ_ENTRY(eventhandler_list) el_link;
|
|
TAILQ_HEAD(,eventhandler_entry) el_entries;
|
|
};
|
|
|
|
typedef struct eventhandler_entry *eventhandler_tag;
|
|
|
|
#define EHL_LOCK(p) mtx_lock(&(p)->el_lock)
|
|
#define EHL_UNLOCK(p) mtx_unlock(&(p)->el_lock)
|
|
#define EHL_LOCK_ASSERT(p, x) mtx_assert(&(p)->el_lock, x)
|
|
|
|
/*
|
|
* Macro to invoke the handlers for a given event.
|
|
*/
|
|
#define _EVENTHANDLER_INVOKE(name, list, ...) do { \
|
|
struct eventhandler_entry *_ep; \
|
|
struct eventhandler_entry_ ## name *_t; \
|
|
\
|
|
KASSERT((list)->el_flags & EHL_INITTED, \
|
|
("eventhandler_invoke: running non-inited list")); \
|
|
EHL_LOCK_ASSERT((list), MA_OWNED); \
|
|
(list)->el_runcount++; \
|
|
KASSERT((list)->el_runcount > 0, \
|
|
("eventhandler_invoke: runcount overflow")); \
|
|
CTR0(KTR_EVH, "eventhandler_invoke(\"" __STRING(name) "\")"); \
|
|
TAILQ_FOREACH(_ep, &((list)->el_entries), ee_link) { \
|
|
if (_ep->ee_priority != EHE_DEAD_PRIORITY) { \
|
|
EHL_UNLOCK((list)); \
|
|
_t = (struct eventhandler_entry_ ## name *)_ep; \
|
|
CTR1(KTR_EVH, "eventhandler_invoke: executing %p", \
|
|
(void *)_t->eh_func); \
|
|
_t->eh_func(_ep->ee_arg , ## __VA_ARGS__); \
|
|
EHL_LOCK((list)); \
|
|
} \
|
|
} \
|
|
KASSERT((list)->el_runcount > 0, \
|
|
("eventhandler_invoke: runcount underflow")); \
|
|
(list)->el_runcount--; \
|
|
if ((list)->el_runcount == 0) \
|
|
eventhandler_prune_list(list); \
|
|
EHL_UNLOCK((list)); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Slow handlers are entirely dynamic; lists are created
|
|
* when entries are added to them, and thus have no concept of "owner",
|
|
*
|
|
* Slow handlers need to be declared, but do not need to be defined. The
|
|
* declaration must be in scope wherever the handler is to be invoked.
|
|
*/
|
|
#define EVENTHANDLER_DECLARE(name, type) \
|
|
struct eventhandler_entry_ ## name \
|
|
{ \
|
|
struct eventhandler_entry ee; \
|
|
type eh_func; \
|
|
}; \
|
|
struct __hack
|
|
|
|
#define EVENTHANDLER_DEFINE(name, func, arg, priority) \
|
|
static eventhandler_tag name ## _tag; \
|
|
static void name ## _evh_init(void *ctx) \
|
|
{ \
|
|
name ## _tag = EVENTHANDLER_REGISTER(name, func, ctx, \
|
|
priority); \
|
|
} \
|
|
SYSINIT(name ## _evh_init, SI_SUB_CONFIGURE, SI_ORDER_ANY, \
|
|
name ## _evh_init, arg); \
|
|
struct __hack
|
|
|
|
#define EVENTHANDLER_INVOKE(name, ...) \
|
|
do { \
|
|
struct eventhandler_list *_el; \
|
|
\
|
|
if ((_el = eventhandler_find_list(#name)) != NULL) \
|
|
_EVENTHANDLER_INVOKE(name, _el , ## __VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#define EVENTHANDLER_REGISTER(name, func, arg, priority) \
|
|
eventhandler_register(NULL, #name, func, arg, priority)
|
|
|
|
#define EVENTHANDLER_DEREGISTER(name, tag) \
|
|
do { \
|
|
struct eventhandler_list *_el; \
|
|
\
|
|
if ((_el = eventhandler_find_list(#name)) != NULL) \
|
|
eventhandler_deregister(_el, tag); \
|
|
} while(0)
|
|
|
|
|
|
eventhandler_tag eventhandler_register(struct eventhandler_list *list,
|
|
const char *name, void *func, void *arg, int priority);
|
|
void eventhandler_deregister(struct eventhandler_list *list,
|
|
eventhandler_tag tag);
|
|
struct eventhandler_list *eventhandler_find_list(const char *name);
|
|
void eventhandler_prune_list(struct eventhandler_list *list);
|
|
|
|
/*
|
|
* Standard system event queues.
|
|
*/
|
|
|
|
/* Generic priority levels */
|
|
#define EVENTHANDLER_PRI_FIRST 0
|
|
#define EVENTHANDLER_PRI_ANY 10000
|
|
#define EVENTHANDLER_PRI_LAST 20000
|
|
|
|
/* Shutdown events */
|
|
typedef void (*shutdown_fn)(void *, int);
|
|
|
|
#define SHUTDOWN_PRI_FIRST EVENTHANDLER_PRI_FIRST
|
|
#define SHUTDOWN_PRI_DEFAULT EVENTHANDLER_PRI_ANY
|
|
#define SHUTDOWN_PRI_LAST EVENTHANDLER_PRI_LAST
|
|
|
|
EVENTHANDLER_DECLARE(shutdown_pre_sync, shutdown_fn); /* before fs sync */
|
|
EVENTHANDLER_DECLARE(shutdown_post_sync, shutdown_fn); /* after fs sync */
|
|
EVENTHANDLER_DECLARE(shutdown_final, shutdown_fn);
|
|
|
|
/* Low memory event */
|
|
typedef void (*vm_lowmem_handler_t)(void *, int);
|
|
#define LOWMEM_PRI_DEFAULT EVENTHANDLER_PRI_FIRST
|
|
EVENTHANDLER_DECLARE(vm_lowmem, vm_lowmem_handler_t);
|
|
|
|
/* Low vnodes event */
|
|
typedef void (*vfs_lowvnodes_handler_t)(void *, int);
|
|
EVENTHANDLER_DECLARE(vfs_lowvnodes, vfs_lowvnodes_handler_t);
|
|
|
|
/* Root mounted event */
|
|
typedef void (*mountroot_handler_t)(void *);
|
|
EVENTHANDLER_DECLARE(mountroot, mountroot_handler_t);
|
|
|
|
/* VLAN state change events */
|
|
struct ifnet;
|
|
typedef void (*vlan_config_fn)(void *, struct ifnet *, uint16_t);
|
|
typedef void (*vlan_unconfig_fn)(void *, struct ifnet *, uint16_t);
|
|
EVENTHANDLER_DECLARE(vlan_config, vlan_config_fn);
|
|
EVENTHANDLER_DECLARE(vlan_unconfig, vlan_unconfig_fn);
|
|
|
|
/* BPF attach/detach events */
|
|
struct ifnet;
|
|
typedef void (*bpf_track_fn)(void *, struct ifnet *, int /* dlt */,
|
|
int /* 1 =>'s attach */);
|
|
EVENTHANDLER_DECLARE(bpf_track, bpf_track_fn);
|
|
|
|
/*
|
|
* Process events
|
|
* process_fork and exit handlers are called without Giant.
|
|
* exec handlers are called with Giant, but that is by accident.
|
|
*/
|
|
struct proc;
|
|
struct image_params;
|
|
|
|
typedef void (*exitlist_fn)(void *, struct proc *);
|
|
typedef void (*forklist_fn)(void *, struct proc *, struct proc *, int);
|
|
typedef void (*execlist_fn)(void *, struct proc *, struct image_params *);
|
|
typedef void (*proc_ctor_fn)(void *, struct proc *);
|
|
typedef void (*proc_dtor_fn)(void *, struct proc *);
|
|
typedef void (*proc_init_fn)(void *, struct proc *);
|
|
typedef void (*proc_fini_fn)(void *, struct proc *);
|
|
EVENTHANDLER_DECLARE(process_ctor, proc_ctor_fn);
|
|
EVENTHANDLER_DECLARE(process_dtor, proc_dtor_fn);
|
|
EVENTHANDLER_DECLARE(process_init, proc_init_fn);
|
|
EVENTHANDLER_DECLARE(process_fini, proc_fini_fn);
|
|
EVENTHANDLER_DECLARE(process_exit, exitlist_fn);
|
|
EVENTHANDLER_DECLARE(process_fork, forklist_fn);
|
|
EVENTHANDLER_DECLARE(process_exec, execlist_fn);
|
|
|
|
struct thread;
|
|
typedef void (*thread_ctor_fn)(void *, struct thread *);
|
|
typedef void (*thread_dtor_fn)(void *, struct thread *);
|
|
typedef void (*thread_fini_fn)(void *, struct thread *);
|
|
typedef void (*thread_init_fn)(void *, struct thread *);
|
|
EVENTHANDLER_DECLARE(thread_ctor, thread_ctor_fn);
|
|
EVENTHANDLER_DECLARE(thread_dtor, thread_dtor_fn);
|
|
EVENTHANDLER_DECLARE(thread_init, thread_init_fn);
|
|
EVENTHANDLER_DECLARE(thread_fini, thread_fini_fn);
|
|
|
|
typedef void (*uma_zone_chfn)(void *);
|
|
EVENTHANDLER_DECLARE(nmbclusters_change, uma_zone_chfn);
|
|
EVENTHANDLER_DECLARE(maxsockets_change, uma_zone_chfn);
|
|
|
|
typedef void(*schedtail_fn)(void *, struct proc *);
|
|
EVENTHANDLER_DECLARE(schedtail, schedtail_fn);
|
|
#endif /* SYS_EVENTHANDLER_H */
|