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Add selinit() / seldestroy() from the vmlocking branch.

This commit is contained in:
ad 2007-09-25 13:53:11 +00:00
parent aa8a5e0d63
commit f8d23a5f1b
2 changed files with 37 additions and 3 deletions
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36
sys/kern/sys_generic.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: sys_generic.c,v 1.106 2007/09/06 04:00:44 rmind Exp $ */ /* $NetBSD: sys_generic.c,v 1.107 2007/09/25 13:53:11 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -77,7 +77,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sys_generic.c,v 1.106 2007/09/06 04:00:44 rmind Exp $"); __KERNEL_RCSID(0, "$NetBSD: sys_generic.c,v 1.107 2007/09/25 13:53:11 ad Exp $");
#include <sys/param.h> #include <sys/param.h>
#include <sys/systm.h> #include <sys/systm.h>
@ -1227,3 +1227,35 @@ selsysinit(void)
mutex_init(&select_lock, MUTEX_DRIVER, IPL_VM); mutex_init(&select_lock, MUTEX_DRIVER, IPL_VM);
cv_init(&select_cv, "select"); cv_init(&select_cv, "select");
} }
/*
* Initialize a selector.
*/
void
selinit(struct selinfo *sip)
{
memset(sip, 0, sizeof(*sip));
}
/*
* Destroy a selector. The owning object must not gain new
* references while this is in progress: all activity on the
* selector must be stopped.
*/
void
seldestroy(struct selinfo *sip)
{
lwp_t *l;
if (sip->sel_lwp == NULL)
return;
mutex_enter(&select_lock);
if ((l = sip->sel_lwp) != NULL) {
/* This should rarely happen, so SLIST_REMOVE() is OK. */
SLIST_REMOVE(&l->l_selwait, sip, selinfo, sel_chain);
sip->sel_lwp = NULL;
}
mutex_exit(&select_lock);
}

4
sys/sys/select.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: select.h,v 1.28 2007/07/09 21:11:33 ad Exp $ */ /* $NetBSD: select.h,v 1.29 2007/09/25 13:53:11 ad Exp $ */
/*- /*-
* Copyright (c) 1992, 1993 * Copyright (c) 1992, 1993
@ -52,6 +52,8 @@ void selrecord(struct lwp *selector, struct selinfo *);
void selwakeup(struct selinfo *); void selwakeup(struct selinfo *);
void selnotify(struct selinfo *sip, long knhint); void selnotify(struct selinfo *sip, long knhint);
void selsysinit(void); void selsysinit(void);
void selinit(struct selinfo *);
void seldestroy(struct selinfo *);
#else /* _KERNEL */ #else /* _KERNEL */