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Add a 'show lockmgr' command that dumps the relevant details of a lockmgr

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lock.
This commit is contained in:
jhb 2006-08-15 16:42:16 +00:00
parent 250b1cf399
commit 9810a59f6d
1 changed files with 32 additions and 0 deletions
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32
sys/kern/kern_lock.c
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@ -43,6 +43,8 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
@ -56,6 +58,10 @@ __FBSDID("$FreeBSD$");
#include <sys/stack.h>
#endif
#ifdef DDB
#include <ddb/ddb.h>
#endif
/*
* Locking primitives implementation.
* Locks provide shared/exclusive sychronization.
@ -581,3 +587,29 @@ lockmgr_printinfo(lkp)
stack_print(&lkp->lk_stack);
#endif
}
#ifdef DDB
DB_SHOW_COMMAND(lockmgr, db_show_lockmgr)
{
struct thread *td;
struct lock *lkp;
if (!have_addr)
return;
lkp = (struct lock *)addr;
db_printf("lock type: %s\n", lkp->lk_wmesg);
db_printf("state: ");
if (lkp->lk_sharecount)
db_printf("SHARED (count %d)\n", lkp->lk_sharecount);
else if (lkp->lk_flags & LK_HAVE_EXCL) {
td = lkp->lk_lockholder;
db_printf("EXCL (count %d) %p ", lkp->lk_exclusivecount, td);
db_printf("(tid %d, pid %d, \"%s\")\n", td->td_tid,
td->td_proc->p_pid, td->td_proc->p_comm);
} else
db_printf("UNLOCKED\n");
if (lkp->lk_waitcount > 0)
db_printf("waiters: %d\n", lkp->lk_waitcount);
}
#endif