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sleepq_block: add a comment.

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ad 2008-06-17 09:11:25 +00:00
parent 629b15f463
commit 4810cbe2bf
1 changed files with 9 additions and 2 deletions
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11
sys/kern/kern_sleepq.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_sleepq.c,v 1.32 2008/06/16 10:02:15 ad Exp $ */
/* $NetBSD: kern_sleepq.c,v 1.33 2008/06/17 09:11:25 ad Exp $ */
/*-
* Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.
@ -35,7 +35,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_sleepq.c,v 1.32 2008/06/16 10:02:15 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_sleepq.c,v 1.33 2008/06/17 09:11:25 ad Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@ -269,6 +269,13 @@ sleepq_block(int timo, bool catch)
if ((l->l_flag & (LW_CANCELLED | LW_WEXIT | LW_WCORE)) != 0)
error = EINTR;
else if ((l->l_flag & LW_PENDSIG) != 0) {
/*
* Acquiring p_lock may cause us to recurse
* through the sleep path and back into this
* routine, but is safe because LWPs sleeping
* on locks are non-interruptable. We will
* not recurse again.
*/
mutex_enter(p->p_lock);
if ((sig = issignal(l)) != 0)
error = sleepq_sigtoerror(l, sig);