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