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do wakeup() only when someone is waiting for us.

This commit is contained in:
yamt 2003-08-11 15:07:14 +00:00
parent 104f2a80df
commit 44d0d57217
2 changed files with 11 additions and 7 deletions
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13
sys/dev/sysmon/sysmon_envsys.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: sysmon_envsys.c,v 1.7 2003/08/11 14:24:41 yamt Exp $ */
/* $NetBSD: sysmon_envsys.c,v 1.8 2003/08/11 15:07:14 yamt Exp $ */
/*-
* Copyright (c) 2000 Zembu Labs, Inc.
@ -41,7 +41,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sysmon_envsys.c,v 1.7 2003/08/11 14:24:41 yamt Exp $");
__KERNEL_RCSID(0, "$NetBSD: sysmon_envsys.c,v 1.8 2003/08/11 15:07:14 yamt Exp $");
#include <sys/param.h>
#include <sys/conf.h>
@ -244,7 +244,7 @@ sysmon_envsys_register(struct sysmon_envsys *sme)
{
int error = 0;
KASSERT((sme->sme_flags & SME_FLAG_BUSY) == 0);
KASSERT((sme->sme_flags & (SME_FLAG_BUSY | SME_FLAG_WANTED)) == 0);
simple_lock(&sysmon_envsys_list_slock);
if (sme->sme_envsys_version != SYSMON_ENVSYS_VERSION) {
@ -272,6 +272,7 @@ sysmon_envsys_unregister(struct sysmon_envsys *sme)
simple_lock(&sysmon_envsys_list_slock);
while (sme->sme_flags & SME_FLAG_BUSY) {
sme->sme_flags |= SME_FLAG_WANTED;
ltsleep(sme, PWAIT, "smeunreg", 0, &sysmon_envsys_list_slock);
}
LIST_REMOVE(sme, sme_list);
@ -296,6 +297,7 @@ again:
if (idx >= sme->sme_fsensor &&
idx < (sme->sme_fsensor + sme->sme_nsensors)) {
if (sme->sme_flags & SME_FLAG_BUSY) {
sme->sme_flags |= SME_FLAG_WANTED;
ltsleep(sme, PWAIT, "smefind", 0,
&sysmon_envsys_list_slock);
goto again;
@ -322,7 +324,8 @@ sysmon_envsys_release(struct sysmon_envsys *sme)
KASSERT(sme->sme_flags & SME_FLAG_BUSY);
simple_lock(&sysmon_envsys_list_slock);
sme->sme_flags &= ~SME_FLAG_BUSY;
wakeup(sme);
if (sme->sme_flags & SME_FLAG_WANTED)
wakeup(sme);
sme->sme_flags &= ~(SME_FLAG_BUSY | SME_FLAG_WANTED);
simple_unlock(&sysmon_envsys_list_slock);
}

5
sys/dev/sysmon/sysmonvar.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: sysmonvar.h,v 1.9 2003/08/11 14:24:41 yamt Exp $ */
/* $NetBSD: sysmonvar.h,v 1.10 2003/08/11 15:07:14 yamt Exp $ */
/*-
* Copyright (c) 2000 Zembu Labs, Inc.
@ -69,10 +69,11 @@ struct sysmon_envsys {
u_int sme_fsensor; /* sensor index base, from sysmon */
u_int sme_nsensors; /* sensor count, from driver */
int sme_flags;
int sme_flags; /* SME_FLAG_ flags defined below */
};
#define SME_FLAG_BUSY 0x00000001 /* sme is busy */
#define SME_FLAG_WANTED 0x00000002 /* someone waiting for this */
#define SME_SENSOR_IDX(sme, idx) ((idx) - (sme)->sme_fsensor)