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- Change selremove_knote() from returning void to bool, and return 

true if the last knote was removed and there are no more knotes
  on the selinfo.
- Use this new return value in filt_sordetach(), filt_sowdetach(),
  filt_fifordetach(), and filt_fifowdetach() to know when to clear
  SB_KOTE without having to know select/kqueue implementation details.
This commit is contained in:
thorpej 2021-09-29 02:47:22 +00:00
parent 4146ac03bb
commit 966aaf884d
4 changed files with 21 additions and 21 deletions
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10
sys/kern/sys_select.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: sys_select.c,v 1.55 2020/12/11 01:25:29 thorpej Exp $ */
/* $NetBSD: sys_select.c,v 1.56 2021/09/29 02:47:22 thorpej Exp $ */
/*-
* Copyright (c) 2007, 2008, 2009, 2010, 2019, 2020 The NetBSD Foundation, Inc.
@ -84,7 +84,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sys_select.c,v 1.55 2020/12/11 01:25:29 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: sys_select.c,v 1.56 2021/09/29 02:47:22 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -682,11 +682,15 @@ selrecord_knote(struct selinfo *sip, struct knote *kn)
* Remove a knote.
*
* The caller holds the same lock as for selrecord().
*
* Returns true if the last knote was removed and the list
* is now empty.
*/
void
bool
selremove_knote(struct selinfo *sip, struct knote *kn)
{
SLIST_REMOVE(&sip->sel_klist, kn, knote, kn_selnext);
return SLIST_EMPTY(&sip->sel_klist);
}
/*

14
sys/kern/uipc_socket.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uipc_socket.c,v 1.296 2021/09/26 01:16:10 thorpej Exp $ */
/* $NetBSD: uipc_socket.c,v 1.297 2021/09/29 02:47:22 thorpej Exp $ */
/*
* Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc.
@ -71,7 +71,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.296 2021/09/26 01:16:10 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.297 2021/09/29 02:47:22 thorpej Exp $");
#ifdef _KERNEL_OPT
#include "opt_compat_netbsd.h"
@ -2225,9 +2225,8 @@ filt_sordetach(struct knote *kn)
so = ((file_t *)kn->kn_obj)->f_socket;
solock(so);
selremove_knote(&so->so_rcv.sb_sel, kn);
if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist)) /* XXX select/kqueue */
so->so_rcv.sb_flags &= ~SB_KNOTE; /* XXX internals */
if (selremove_knote(&so->so_rcv.sb_sel, kn))
so->so_rcv.sb_flags &= ~SB_KNOTE;
sounlock(so);
}
@ -2264,9 +2263,8 @@ filt_sowdetach(struct knote *kn)
so = ((file_t *)kn->kn_obj)->f_socket;
solock(so);
selremove_knote(&so->so_snd.sb_sel, kn);
if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist)) /* XXX select/kqueue */
so->so_snd.sb_flags &= ~SB_KNOTE; /* XXX internals */
if (selremove_knote(&so->so_snd.sb_sel, kn))
so->so_snd.sb_flags &= ~SB_KNOTE;
sounlock(so);
}

14
sys/miscfs/fifofs/fifo_vnops.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: fifo_vnops.c,v 1.84 2021/09/26 01:16:10 thorpej Exp $ */
/* $NetBSD: fifo_vnops.c,v 1.85 2021/09/29 02:47:22 thorpej Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
@ -58,7 +58,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fifo_vnops.c,v 1.84 2021/09/26 01:16:10 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: fifo_vnops.c,v 1.85 2021/09/29 02:47:22 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -516,9 +516,8 @@ filt_fifordetach(struct knote *kn)
so = (struct socket *)kn->kn_hook;
solock(so);
selremove_knote(&so->so_rcv.sb_sel, kn);
if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist)) /* XXX select/kqueue */
so->so_rcv.sb_flags &= ~SB_KNOTE; /* XXX internals */
if (selremove_knote(&so->so_rcv.sb_sel, kn))
so->so_rcv.sb_flags &= ~SB_KNOTE;
sounlock(so);
}
@ -551,9 +550,8 @@ filt_fifowdetach(struct knote *kn)
so = (struct socket *)kn->kn_hook;
solock(so);
selremove_knote(&so->so_snd.sb_sel, kn);
if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist)) /* XXX select/kqueue */
so->so_snd.sb_flags &= ~SB_KNOTE; /* XXX internals */
if (selremove_knote(&so->so_snd.sb_sel, kn))
so->so_snd.sb_flags &= ~SB_KNOTE;
sounlock(so);
}

4
sys/sys/select.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: select.h,v 1.38 2020/12/11 01:25:29 thorpej Exp $ */
/* $NetBSD: select.h,v 1.39 2021/09/29 02:47:22 thorpej Exp $ */
/*-
* Copyright (c) 1992, 1993
@ -53,7 +53,7 @@ int selcommon(register_t *, int, fd_set *, fd_set *, fd_set *,
struct timespec *, sigset_t *);
void selrecord(struct lwp *selector, struct selinfo *);
void selrecord_knote(struct selinfo *, struct knote *);
void selremove_knote(struct selinfo *, struct knote *);
bool selremove_knote(struct selinfo *, struct knote *);
void selnotify(struct selinfo *, int, long);
void selsysinit(struct cpu_info *);
void selinit(struct selinfo *);