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Re-adding an event to a kqueue modifies the parameters of the original event.

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However, if the original knote had been disabled then it is not automatically
re-enabled.

Fix this by using EV_ADD to create an mevent and EV_ENABLE to enable it.

Adding a kevent for the first time implicitly enables it so existing callers
of mevent_add() don't need to change.

Reviewed by:	grehan
This commit is contained in:
Neel Natu 2014-05-05 16:30:03 +00:00
parent 055fc2cb5e
commit 09fd42cb88
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=265365
1 changed files with 12 additions and 7 deletions
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19
usr.sbin/bhyve/mevent.c
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@ -52,9 +52,10 @@ __FBSDID("$FreeBSD$");
#define MEVENT_MAX 64
#define MEV_ENABLE 1
#define MEV_DISABLE 2
#define MEV_DEL_PENDING 3
#define MEV_ADD 1
#define MEV_ENABLE 2
#define MEV_DISABLE 3
#define MEV_DEL_PENDING 4
extern char *vmname;
@ -147,10 +148,11 @@ mevent_kq_flags(struct mevent *mevp)
int ret;
switch (mevp->me_state) {
case MEV_ADD:
ret = EV_ADD; /* implicitly enabled */
break;
case MEV_ENABLE:
ret = EV_ADD;
if (mevp->me_type == EVF_TIMER)
ret |= EV_ENABLE;
ret = EV_ENABLE;
break;
case MEV_DISABLE:
ret = EV_DISABLE;
@ -158,6 +160,9 @@ mevent_kq_flags(struct mevent *mevp)
case MEV_DEL_PENDING:
ret = EV_DELETE;
break;
default:
assert(0);
break;
}
return (ret);
@ -284,7 +289,7 @@ mevent_add(int tfd, enum ev_type type,
LIST_INSERT_HEAD(&change_head, mevp, me_list);
mevp->me_cq = 1;
mevp->me_state = MEV_ENABLE;
mevp->me_state = MEV_ADD;
mevent_notify();
exit: