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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Portions Copyright 2006 OmniTI, Inc.
*/
/* #pragma ident "@(#)umem_update_thread.c 1.2 05/06/08 SMI" */
#include "config.h"
#include "umem_base.h"
#include "vmem_base.h"
#include <signal.h>
/*
* we use the _ version, since we don't want to be cancelled.
*/
extern int _cond_timedwait(cond_t *cv, mutex_t *mutex, const timespec_t *delay);
/*ARGSUSED*/
static THR_RETURN
THR_API umem_update_thread(void *arg)
{
struct timeval now;
int in_update = 0;
(void) mutex_lock(&umem_update_lock);
ASSERT(umem_update_thr == thr_self());
ASSERT(umem_st_update_thr == 0);
for (;;) {
umem_process_updates();
if (in_update) {
in_update = 0;
/*
* we wait until now to set the next update time
* so that the updates are self-throttling
*/
(void) gettimeofday(&umem_update_next, NULL);
umem_update_next.tv_sec += umem_reap_interval;
}
switch (umem_reaping) {
case UMEM_REAP_DONE:
case UMEM_REAP_ADDING:
break;
case UMEM_REAP_ACTIVE:
umem_reap_next = gethrtime() +
(hrtime_t)umem_reap_interval * NANOSEC;
umem_reaping = UMEM_REAP_DONE;
break;
default:
ASSERT(umem_reaping == UMEM_REAP_DONE ||
umem_reaping == UMEM_REAP_ADDING ||
umem_reaping == UMEM_REAP_ACTIVE);
break;
}
(void) gettimeofday(&now, NULL);
if (now.tv_sec > umem_update_next.tv_sec ||
(now.tv_sec == umem_update_next.tv_sec &&
now.tv_usec >= umem_update_next.tv_usec)) {
/*
* Time to run an update
*/
(void) mutex_unlock(&umem_update_lock);
vmem_update(NULL);
/*
* umem_cache_update can use umem_add_update to
* request further work. The update is not complete
* until all such work is finished.
*/
umem_cache_applyall(umem_cache_update);
(void) mutex_lock(&umem_update_lock);
in_update = 1;
continue; /* start processing immediately */
}
/*
* if there is no work to do, we wait until it is time for
* next update, or someone wakes us.
*/
if (umem_null_cache.cache_unext == &umem_null_cache) {
timespec_t abs_time;
abs_time.tv_sec = umem_update_next.tv_sec;
abs_time.tv_nsec = umem_update_next.tv_usec * 1000;
(void) _cond_timedwait(&umem_update_cv,
&umem_update_lock, &abs_time);
}
}
/* LINTED no return statement */
}
int
umem_create_update_thread(void)
{
#ifndef _WIN32
sigset_t sigmask, oldmask;
#endif
ASSERT(MUTEX_HELD(&umem_update_lock));
ASSERT(umem_update_thr == 0);
#ifndef _WIN32
/*
* The update thread handles no signals
*/
(void) sigfillset(&sigmask);
(void) thr_sigsetmask(SIG_BLOCK, &sigmask, &oldmask);
#endif
if (thr_create(NULL, 0, umem_update_thread, NULL,
THR_BOUND | THR_DAEMON | THR_DETACHED, &umem_update_thr) == 0) {
#ifndef _WIN32
(void) thr_sigsetmask(SIG_SETMASK, &oldmask, NULL);
#endif
return (1);
}
umem_update_thr = 0;
#ifndef _WIN32
(void) thr_sigsetmask(SIG_SETMASK, &oldmask, NULL);
#endif
return (0);
}
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