#ifndef _SYS_EVENTHANDLER_H_
#define _SYS_EVENTHANDLER_H_
#include <kern/locks.h>
#include <sys/queue.h>
#include <sys/cdefs.h>
#include <sys/syslog.h>
#include <uuid/uuid.h>
extern int evh_debug;
extern lck_grp_t *el_lock_grp;
extern lck_attr_t *el_lock_attr;
extern struct eventhandler_entry_arg eventhandler_entry_dummy_arg;
struct eventhandler_lists_ctxt {
TAILQ_HEAD(, eventhandler_list) eventhandler_lists;
int eventhandler_lists_initted;
decl_lck_mtx_data(, eventhandler_mutex);
};
struct eventhandler_entry_arg {
uuid_t ee_fm_uuid;
uuid_t ee_fr_uuid;
};
struct eventhandler_entry {
TAILQ_ENTRY(eventhandler_entry) ee_link;
int ee_priority;
#define EHE_DEAD_PRIORITY (-1)
struct eventhandler_entry_arg ee_arg;
};
#define EVENTHANDLER_MAX_NAME 32
struct eventhandler_list {
char el_name[EVENTHANDLER_MAX_NAME];
int el_flags;
#define EHL_INITTED (1<<0)
u_int el_runcount;
decl_lck_mtx_data(, el_lock);
TAILQ_ENTRY(eventhandler_list) el_link;
TAILQ_HEAD(, eventhandler_entry) el_entries;
};
typedef struct eventhandler_entry *eventhandler_tag;
#define EHL_LOCK_INIT(p) lck_mtx_init(&(p)->el_lock, el_lock_grp, el_lock_attr)
#define EHL_LOCK(p) lck_mtx_lock(&(p)->el_lock)
#define EHL_LOCK_SPIN(p) lck_mtx_lock_spin(&(p)->el_lock)
#define EHL_LOCK_CONVERT(p) lck_mtx_convert_spin(&(p)->el_lock)
#define EHL_UNLOCK(p) lck_mtx_unlock(&(p)->el_lock)
#define EHL_LOCK_ASSERT(p, x) LCK_MTX_ASSERT(&(p)->el_lock, x)
#define EHL_LOCK_DESTROY(p) lck_mtx_destroy(&(p)->el_lock, el_lock_grp)
#define evhlog(x) do { if (evh_debug >= 1) log x; } while (0)
#define _EVENTHANDLER_INVOKE(name, list, ...) do { \
struct eventhandler_entry *_ep; \
struct eventhandler_entry_ ## name *_t; \
\
VERIFY((list)->el_flags & EHL_INITTED); \
EHL_LOCK_ASSERT((list), LCK_MTX_ASSERT_OWNED); \
(list)->el_runcount++; \
VERIFY((list)->el_runcount > 0); \
evhlog((LOG_DEBUG, "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; \
evhlog((LOG_DEBUG, "eventhandler_invoke: executing %p", \
VM_KERNEL_UNSLIDE((void *)_t->eh_func))); \
_t->eh_func(_ep->ee_arg , ## __VA_ARGS__); \
EHL_LOCK_SPIN((list)); \
} \
} \
VERIFY((list)->el_runcount > 0); \
(list)->el_runcount--; \
if ((list)->el_runcount == 0) { \
EHL_LOCK_CONVERT((list)); \
eventhandler_prune_list(list); \
} \
EHL_UNLOCK((list)); \
} while (0)
#define EVENTHANDLER_DECLARE(name, type) \
struct eventhandler_entry_ ## name \
{ \
struct eventhandler_entry ee; \
type eh_func; \
}; \
struct __hack
#define EVENTHANDLER_DEFINE(evthdlr_ref, name, func, arg, priority) \
static eventhandler_tag name ## _tag; \
static void name ## _evh_init(void *ctx) \
{ \
name ## _tag = EVENTHANDLER_REGISTER(evthdlr_ref, name, func, ctx, \
priority); \
} \
SYSINIT(name ## _evh_init, SI_SUB_CONFIGURE, SI_ORDER_ANY, \
name ## _evh_init, arg); \
struct __hack
#define EVENTHANDLER_INVOKE(evthdlr_ref, name, ...) \
do { \
struct eventhandler_list *_el; \
\
if ((_el = eventhandler_find_list(evthdlr_ref, #name)) != NULL) \
_EVENTHANDLER_INVOKE(name, _el , ## __VA_ARGS__); \
} while (0)
#define EVENTHANDLER_REGISTER(evthdlr_ref, name, func, arg, priority) \
eventhandler_register(evthdlr_ref, NULL, #name, func, arg, priority)
#define EVENTHANDLER_DEREGISTER(evthdlr_ref, name, tag) \
do { \
struct eventhandler_list *_el; \
\
if ((_el = eventhandler_find_list(evthdlr_ref, #name)) != NULL) \
eventhandler_deregister(_el, tag); \
} while(0)
void eventhandler_init(void);
extern void eventhandler_reap_caches(boolean_t);
eventhandler_tag eventhandler_register(struct eventhandler_lists_ctxt *evthdlr_lists_ctxt,
struct eventhandler_list *list, const char *name, void *func, struct eventhandler_entry_arg arg, int priority);
void eventhandler_deregister(struct eventhandler_list *list,
eventhandler_tag tag);
struct eventhandler_list *eventhandler_find_list(
struct eventhandler_lists_ctxt *evthdlr_lists_ctxt, const char *name);
void eventhandler_prune_list(struct eventhandler_list *list);
void eventhandler_lists_ctxt_init(struct eventhandler_lists_ctxt *evthdlr_lists_ctxt);
void eventhandler_lists_ctxt_destroy(struct eventhandler_lists_ctxt *evthdlr_lists_ctxt);
#define EVENTHANDLER_PRI_FIRST 0
#define EVENTHANDLER_PRI_ANY 10000
#define EVENTHANDLER_PRI_LAST 20000
#endif