Date: Thu, 12 Mar 2009 10:34:17 +0000 (UTC) From: Bruce M Simpson <bms@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r189735 - head/sys/kern Message-ID: <200903121034.n2CAYHSK028116@svn.freebsd.org>
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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); }
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