From owner-svn-src-head@FreeBSD.ORG  Thu Mar 12 10:34:17 2009
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 319F4106564A;
	Thu, 12 Mar 2009 10:34:17 +0000 (UTC) (envelope-from bms@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id 2018E8FC0A;
	Thu, 12 Mar 2009 10:34:17 +0000 (UTC) (envelope-from bms@FreeBSD.org)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id n2CAYH0L028117;
	Thu, 12 Mar 2009 10:34:17 GMT (envelope-from bms@svn.freebsd.org)
Received: (from bms@localhost)
	by svn.freebsd.org (8.14.3/8.14.3/Submit) id n2CAYHSK028116;
	Thu, 12 Mar 2009 10:34:17 GMT (envelope-from bms@svn.freebsd.org)
Message-Id: <200903121034.n2CAYHSK028116@svn.freebsd.org>
From: Bruce M Simpson <bms@FreeBSD.org>
Date: Thu, 12 Mar 2009 10:34:17 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-head@freebsd.org
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r189735 - head/sys/kern
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
	<svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
	<mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
	<mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 12 Mar 2009 10:34:17 -0000

Author: bms
Date: Thu Mar 12 10:34:16 2009
New Revision: 189735
URL: http://svn.freebsd.org/changeset/base/189735

Log:
  Make semaphore debugging output more useful.
  
  PR:             http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/127545
  MFC after:      5 days
  Submitted by:   Philip Semanchuk

Modified:
  head/sys/kern/uipc_sem.c

Modified: head/sys/kern/uipc_sem.c
==============================================================================
--- head/sys/kern/uipc_sem.c	Thu Mar 12 09:56:15 2009	(r189734)
+++ head/sys/kern/uipc_sem.c	Thu Mar 12 10:34:16 2009	(r189735)
@@ -548,6 +548,8 @@ int
 ksem_open(struct thread *td, struct ksem_open_args *uap)
 {
 
+	DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid));
+
 	if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
 		return (EINVAL);
 	return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
@@ -708,12 +710,14 @@ kern_sem_wait(struct thread *td, semid_t
 	struct ksem *ks;
 	int error;
 
-	DP((">>> kern_sem_wait entered!\n"));
+	DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid));
 	error = ksem_get(td, id, &fp);
 	if (error)
 		return (error);
 	ks = fp->f_data;
 	mtx_lock(&sem_lock);
+	DP((">>> kern_sem_wait critical section entered! pid=%d\n",
+	    (int)td->td_proc->p_pid));
 #ifdef MAC
 	error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks);
 	if (error) {
@@ -750,11 +754,13 @@ kern_sem_wait(struct thread *td, semid_t
 			goto err;
 	}
 	ks->ks_value--;
+	DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value));
 	error = 0;
 err:
 	mtx_unlock(&sem_lock);
 	fdrop(fp, td);
-	DP(("<<< kern_sem_wait leaving, error = %d\n", error));
+	DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n",
+	    (int)td->td_proc->p_pid, error));
 	return (error);
 }