--- //depot/vendor/freebsd/src/sys/kern/kern_mutex.c	2005/10/18 18:30:35
+++ //depot/projects/smpng/sys/kern/kern_mutex.c	2005/12/08 22:23:18
@@ -89,16 +94,26 @@
 #define mtx_owner(m)	(mtx_unowned((m)) ? NULL \
 	: (struct thread *)((m)->mtx_lock & MTX_FLAGMASK))
 
+#ifdef DDB
+static void	db_show_mtx(struct lock_object *lock);
+#endif
+
 /*
  * Lock classes for sleep and spin mutexes.
  */
 struct lock_class lock_class_mtx_sleep = {
 	"sleep mutex",
-	LC_SLEEPLOCK | LC_RECURSABLE
+	LC_SLEEPLOCK | LC_RECURSABLE,
+#ifdef DDB
+	db_show_mtx
+#endif
 };
 struct lock_class lock_class_mtx_spin = {
 	"spin mutex",
-	LC_SPINLOCK | LC_RECURSABLE
+	LC_SPINLOCK | LC_RECURSABLE,
+#ifdef DDB
+	db_show_mtx
+#endif
 };
 
 /*
@@ -905,3 +950,56 @@
 	mtx_init(&devmtx, "cdev", NULL, MTX_DEF);
 	mtx_lock(&Giant);
 }
+
+#ifdef DDB
+/* XXX: This function is not mutex-specific. */
+DB_SHOW_COMMAND(lock, db_show_lock)
+{
+	struct lock_object *lock;
+
+	if (!have_addr)
+		return;
+	lock = (struct lock_object *)addr;
+	if (lock->lo_class != &lock_class_mtx_sleep &&
+	    lock->lo_class != &lock_class_mtx_spin &&
+	    lock->lo_class != &lock_class_sx) {
+		db_printf("Unknown lock class\n");
+		return;
+	}
+	db_printf(" class: %s\n", lock->lo_class->lc_name);
+	db_printf(" name: %s\n", lock->lo_name);
+	if (lock->lo_type && lock->lo_type != lock->lo_name)
+		db_printf(" type: %s\n", lock->lo_type);
+	lock->lo_class->lc_ddb_show(lock);
+}
+
+void
+db_show_mtx(struct lock_object *lock)
+{
+	struct thread *td;
+	struct mtx *m;
+
+	m = (struct mtx *)lock;
+
+	db_printf(" flags: {");
+	if (m->mtx_object.lo_class == &lock_class_mtx_spin)
+		db_printf("SPIN");
+	else
+		db_printf("DEF");
+	if (m->mtx_object.lo_flags & LO_RECURSABLE)
+		db_printf(", RECURSE");
+	if (m->mtx_object.lo_flags & LO_DUPOK)
+		db_printf(", DUPOK");
+	db_printf("}\n");
+	db_printf(" owner: ");
+	if (mtx_unowned(m))
+		db_printf("UNOWNED\n");
+	else {
+		td = mtx_owner(m);
+		db_printf("%p (tid %d, pid %d, \"%s\")\n", td, td->td_tid,
+		    td->td_proc->p_pid, td->td_proc->p_comm);
+		if (mtx_recursed(m))
+			db_printf(" recursed: %d\n", m->mtx_recurse);
+	}
+}
+#endif
--- //depot/vendor/freebsd/src/sys/kern/kern_sx.c	2005/01/06 23:37:37
+++ //depot/projects/smpng/sys/kern/kern_sx.c	2005/12/08 22:23:18
@@ -36,17 +36,30 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD: src/sys/kern/kern_sx.c,v 1.25 2005/01/06 23:35:39 imp Exp $");
 
+#include "opt_ddb.h"
+
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/ktr.h>
+#include <sys/linker_set.h>
 #include <sys/condvar.h>
 #include <sys/lock.h>
 #include <sys/mutex.h>
+#include <sys/proc.h>
 #include <sys/sx.h>
 
+#include <ddb/ddb.h>
+
+#ifdef DDB
+static void	db_show_sx(struct lock_object *lock);
+#endif
+
 struct lock_class lock_class_sx = {
 	"sx",
-	LC_SLEEPLOCK | LC_SLEEPABLE | LC_RECURSABLE | LC_UPGRADABLE
+	LC_SLEEPLOCK | LC_SLEEPABLE | LC_RECURSABLE | LC_UPGRADABLE,
+#ifdef DDB
+	db_show_sx
+#endif
 };
 
 #ifndef INVARIANTS
@@ -367,3 +380,26 @@
 	}
 }
 #endif	/* INVARIANT_SUPPORT */
+
+#ifdef DDB
+void
+db_show_sx(struct lock_object *lock)
+{
+	struct thread *td;
+	struct sx *sx;
+
+	sx = (struct sx *)lock;
+
+	db_printf(" locked: ");
+	if (sx->sx_cnt < 0) {
+		td = sx->sx_xholder;
+		db_printf(" XLOCK: %p (tid %d, pid %d, \"%s\")\n", td,
+		    td->td_tid, td->td_proc->p_pid, td->td_proc->p_comm);
+	} else if (sx->sx_cnt > 0)
+		db_printf(" SLOCK: %d locks\n", sx->sx_cnt);
+	else
+		db_printf(" UNLOCKED\n");
+	db_printf(" waiters: %d shared, %d exclusive\n", sx->sx_shrd_wcnt,
+	    sx->sx_excl_wcnt);
+}
+#endif
--- //depot/vendor/freebsd/src/sys/sys/lock.h	2005/12/05 22:03:48
+++ //depot/projects/smpng/sys/sys/lock.h	2005/12/08 22:23:18
@@ -50,6 +50,7 @@
 struct lock_class {
 	const	char *lc_name;
 	u_int	lc_flags;
+	void	(*lc_ddb_show)(struct lock_object *lock);
 };
 
 #define	LC_SLEEPLOCK	0x00000001	/* Sleep lock. */