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Masterwork From Distant Lands
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mjoras
Oct 20 2017, 1:47 AM
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Masterwork From Distant Lands
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diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index f71ba6efaf5..3bb0becb9c9 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -569,10 +569,10 @@ proc0_init(void *dummy __unused)
* Call the init and ctor for the new thread and proc. We wait
* to do this until all other structures are fairly sane.
*/
- EVENTHANDLER_INVOKE(process_init, p);
- EVENTHANDLER_INVOKE(thread_init, td);
- EVENTHANDLER_INVOKE(process_ctor, p);
- EVENTHANDLER_INVOKE(thread_ctor, td);
+ EVENTHANDLER_STATIC_INVOKE(process_init, p);
+ EVENTHANDLER_STATIC_INVOKE(thread_init, td);
+ EVENTHANDLER_STATIC_INVOKE(process_ctor, p);
+ EVENTHANDLER_STATIC_INVOKE(thread_ctor, td);
/*
* Charge root for one process.
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
index 953da2d908a..70fa5f1577c 100644
--- a/sys/kern/kern_exec.c
+++ b/sys/kern/kern_exec.c
@@ -1074,7 +1074,7 @@ exec_new_vmspace(struct image_params *imgp, struct sysentvec *sv)
imgp->sysent = sv;
/* May be called with Giant held */
- EVENTHANDLER_INVOKE(process_exec, p, imgp);
+ EVENTHANDLER_STATIC_INVOKE(process_exec, p, imgp);
/*
* Blow away entire process VM, if address space not shared,
diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index d05951e150c..ad86035b75c 100644
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -329,7 +329,7 @@ exit1(struct thread *td, int rval, int signo)
* Event handler could change exit status.
* XXX what if one of these generates an error?
*/
- EVENTHANDLER_INVOKE(process_exit, p);
+ EVENTHANDLER_STATIC_INVOKE(process_exit, p);
/*
* If parent is waiting for us to exit or exec,
diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c
index 997a783522e..bac4787815c 100644
--- a/sys/kern/kern_fork.c
+++ b/sys/kern/kern_fork.c
@@ -699,7 +699,7 @@ do_fork(struct thread *td, struct fork_req *fr, struct proc *p2, struct thread *
* Both processes are set up, now check if any loadable modules want
* to adjust anything.
*/
- EVENTHANDLER_INVOKE(process_fork, p1, p2, fr->fr_flags);
+ EVENTHANDLER_STATIC_INVOKE(process_fork, p1, p2, fr->fr_flags);
/*
* Set the child start time and mark the process as being complete.
diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c
index de829228b1d..ac28436a774 100644
--- a/sys/kern/kern_proc.c
+++ b/sys/kern/kern_proc.c
@@ -151,6 +151,14 @@ const int thread_off_td_oncpu = offsetof(struct thread, td_oncpu);
const int thread_off_td_pcb = offsetof(struct thread, td_pcb);
const int thread_off_td_plist = offsetof(struct thread, td_plist);
+EVENTHANDLER_STATIC_DEFINE(process_ctor);
+EVENTHANDLER_STATIC_DEFINE(process_dtor);
+EVENTHANDLER_STATIC_DEFINE(process_init);
+EVENTHANDLER_STATIC_DEFINE(process_fini);
+EVENTHANDLER_STATIC_DEFINE(process_exit);
+EVENTHANDLER_STATIC_DEFINE(process_fork);
+EVENTHANDLER_STATIC_DEFINE(process_exec);
+
int kstack_pages = KSTACK_PAGES;
SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0,
"Kernel stack size in pages");
@@ -195,12 +203,12 @@ proc_ctor(void *mem, int size, void *arg, int flags)
p = (struct proc *)mem;
SDT_PROBE4(proc, , ctor , entry, p, size, arg, flags);
- EVENTHANDLER_INVOKE(process_ctor, p);
+ EVENTHANDLER_STATIC_INVOKE(process_ctor, p);
SDT_PROBE4(proc, , ctor , return, p, size, arg, flags);
td = FIRST_THREAD_IN_PROC(p);
if (td != NULL) {
/* Make sure all thread constructors are executed */
- EVENTHANDLER_INVOKE(thread_ctor, td);
+ EVENTHANDLER_STATIC_INVOKE(thread_ctor, td);
}
return (0);
}
@@ -230,9 +238,9 @@ proc_dtor(void *mem, int size, void *arg)
MPASS(td->td_su == NULL);
/* Make sure all thread destructors are executed */
- EVENTHANDLER_INVOKE(thread_dtor, td);
+ EVENTHANDLER_STATIC_INVOKE(thread_dtor, td);
}
- EVENTHANDLER_INVOKE(process_dtor, p);
+ EVENTHANDLER_STATIC_INVOKE(process_dtor, p);
if (p->p_ksi != NULL)
KASSERT(! KSI_ONQ(p->p_ksi), ("SIGCHLD queue"));
SDT_PROBE3(proc, , dtor, return, p, size, arg);
@@ -256,7 +264,7 @@ proc_init(void *mem, int size, int flags)
cv_init(&p->p_pwait, "ppwait");
cv_init(&p->p_dbgwait, "dbgwait");
TAILQ_INIT(&p->p_threads); /* all threads in proc */
- EVENTHANDLER_INVOKE(process_init, p);
+ EVENTHANDLER_STATIC_INVOKE(process_init, p);
p->p_stats = pstats_alloc();
p->p_pgrp = NULL;
SDT_PROBE3(proc, , init, return, p, size, flags);
@@ -274,7 +282,7 @@ proc_fini(void *mem, int size)
struct proc *p;
p = (struct proc *)mem;
- EVENTHANDLER_INVOKE(process_fini, p);
+ EVENTHANDLER_STATIC_INVOKE(process_fini, p);
pstats_free(p->p_stats);
thread_free(FIRST_THREAD_IN_PROC(p));
mtx_destroy(&p->p_mtx);
diff --git a/sys/kern/kern_thread.c b/sys/kern/kern_thread.c
index d3e7e306a68..a93e1bd4bae 100644
--- a/sys/kern/kern_thread.c
+++ b/sys/kern/kern_thread.c
@@ -144,6 +144,11 @@ struct tidhashhead *tidhashtbl;
u_long tidhash;
struct rwlock tidhash_lock;
+EVENTHANDLER_STATIC_DEFINE(thread_ctor);
+EVENTHANDLER_STATIC_DEFINE(thread_dtor);
+EVENTHANDLER_STATIC_DEFINE(thread_init);
+EVENTHANDLER_STATIC_DEFINE(thread_fini);
+
static lwpid_t
tid_alloc(void)
{
@@ -201,7 +206,7 @@ thread_ctor(void *mem, int size, void *arg, int flags)
*/
td->td_critnest = 1;
td->td_lend_user_pri = PRI_MAX;
- EVENTHANDLER_INVOKE(thread_ctor, td);
+ EVENTHANDLER_STATIC_INVOKE(thread_ctor, td);
#ifdef AUDIT
audit_thread_alloc(td);
#endif
@@ -247,7 +252,7 @@ thread_dtor(void *mem, int size, void *arg)
td_softdep_cleanup(td);
MPASS(td->td_su == NULL);
- EVENTHANDLER_INVOKE(thread_dtor, td);
+ EVENTHANDLER_STATIC_INVOKE(thread_dtor, td);
tid_free(td->td_tid);
}
@@ -264,7 +269,7 @@ thread_init(void *mem, int size, int flags)
td->td_sleepqueue = sleepq_alloc();
td->td_turnstile = turnstile_alloc();
td->td_rlqe = NULL;
- EVENTHANDLER_INVOKE(thread_init, td);
+ EVENTHANDLER_STATIC_INVOKE(thread_init, td);
umtx_thread_init(td);
td->td_kstack = 0;
td->td_sel = NULL;
@@ -280,7 +285,7 @@ thread_fini(void *mem, int size)
struct thread *td;
td = (struct thread *)mem;
- EVENTHANDLER_INVOKE(thread_fini, td);
+ EVENTHANDLER_STATIC_INVOKE(thread_fini, td);
rlqentry_free(td->td_rlqe);
turnstile_free(td->td_turnstile);
sleepq_free(td->td_sleepqueue);
diff --git a/sys/kern/subr_eventhandler.c b/sys/kern/subr_eventhandler.c
index 793210cfe94..c21f322e0f1 100644
--- a/sys/kern/subr_eventhandler.c
+++ b/sys/kern/subr_eventhandler.c
@@ -137,6 +137,17 @@ eventhandler_register_internal(struct eventhandler_list *list,
return(epn);
}
+void
+_eventhandler_insert_static(void *ctx)
+{
+ struct eventhandler_list *list = ctx;
+ KASSERT(eventhandler_lists_initted,
+ ("eventhandler registered too early"));
+ mtx_lock(&eventhandler_mutex);
+ TAILQ_INSERT_HEAD(&eventhandler_lists, list, el_link);
+ mtx_unlock(&eventhandler_mutex);
+}
+
eventhandler_tag
eventhandler_register(struct eventhandler_list *list, const char *name,
void *func, void *arg, int priority)
diff --git a/sys/sys/eventhandler.h b/sys/sys/eventhandler.h
index 7fccffffa8a..a226876e94d 100644
--- a/sys/sys/eventhandler.h
+++ b/sys/sys/eventhandler.h
@@ -97,11 +97,45 @@ typedef struct eventhandler_entry *eventhandler_tag;
EHL_UNLOCK((list)); \
} while (0)
+void _eventhandler_insert_static(void *ctx);
+
+/*
+ * Static event handler lists require the eventhandler list be present at link
+ * time. They don't allow addition of entries to unknown eventhandler lists.
+ *
+ * Static handler lists must be defined once by the "owner" of the eventhandler
+ * list, and the declaration must be in scope at any point the list is
+ * manipulated.
+ */
+#define EVENTHANDLER_STATIC_DECLARE(name, type) \
+extern struct eventhandler_list Xeventhandler_list_ ## name ; \
+struct eventhandler_entry_ ## name { \
+ struct eventhandler_entry ee; \
+ type eh_func; \
+}; \
+struct __hack
+
+#define EVENTHANDLER_STATIC_DEFINE(name) \
+struct eventhandler_list Xeventhandler_list_ ## name = { #name }; \
+SYSINIT(name ## _evh_insert, SI_SUB_CONFIGURE, SI_ORDER_ANY, \
+ _eventhandler_insert_static, &Xeventhandler_list_ ## name); \
+ struct __hack
+
+#define EVENTHANDLER_STATIC_INVOKE(name, ...) \
+do { \
+ struct eventhandler_list *_el = &Xeventhandler_list_ ## name ; \
+ \
+ if (_el->el_flags & EHL_INITTED) { \
+ EHL_LOCK(_el); \
+ _EVENTHANDLER_INVOKE(name, _el , ## __VA_ARGS__); \
+ } \
+} while (0)
+
/*
- * Slow handlers are entirely dynamic; lists are created
+ * Non-static 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
+ * These 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) \
@@ -228,13 +262,13 @@ 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);
+EVENTHANDLER_STATIC_DECLARE(process_ctor, proc_ctor_fn);
+EVENTHANDLER_STATIC_DECLARE(process_dtor, proc_dtor_fn);
+EVENTHANDLER_STATIC_DECLARE(process_init, proc_init_fn);
+EVENTHANDLER_STATIC_DECLARE(process_fini, proc_fini_fn);
+EVENTHANDLER_STATIC_DECLARE(process_exit, exitlist_fn);
+EVENTHANDLER_STATIC_DECLARE(process_fork, forklist_fn);
+EVENTHANDLER_STATIC_DECLARE(process_exec, execlist_fn);
/*
* application dump event
@@ -253,10 +287,10 @@ 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);
+EVENTHANDLER_STATIC_DECLARE(thread_ctor, thread_ctor_fn);
+EVENTHANDLER_STATIC_DECLARE(thread_dtor, thread_dtor_fn);
+EVENTHANDLER_STATIC_DECLARE(thread_init, thread_init_fn);
+EVENTHANDLER_STATIC_DECLARE(thread_fini, thread_fini_fn);
typedef void (*uma_zone_chfn)(void *);
EVENTHANDLER_DECLARE(nmbclusters_change, uma_zone_chfn);

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