213 lines
5.5 KiB
C
213 lines
5.5 KiB
C
/*
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* Copyright (c) 2004-2016 Maxim Sobolev <sobomax@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <err.h>
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#include <pthread.h>
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#include <stdint.h>
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#include <stdlib.h>
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#if defined(MKUZ_DEBUG)
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# include <assert.h>
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#endif
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#include "mkuzip.h"
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#include "mkuz_fqueue.h"
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#include "mkuz_conveyor.h"
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#include "mkuz_blk.h"
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#include "mkuz_blk_chain.h"
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struct mkuz_fifo_queue *
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mkuz_fqueue_ctor(int wakeup_len)
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{
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struct mkuz_fifo_queue *fqp;
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fqp = mkuz_safe_zmalloc(sizeof(struct mkuz_fifo_queue));
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fqp->wakeup_len = wakeup_len;
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if (pthread_mutex_init(&fqp->mtx, NULL) != 0) {
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errx(1, "pthread_mutex_init() failed");
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}
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if (pthread_cond_init(&fqp->cvar, NULL) != 0) {
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errx(1, "pthread_cond_init() failed");
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}
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return (fqp);
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}
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void
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mkuz_fqueue_enq(struct mkuz_fifo_queue *fqp, struct mkuz_blk *bp)
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{
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struct mkuz_bchain_link *ip;
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ip = mkuz_safe_zmalloc(sizeof(struct mkuz_bchain_link));
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ip->this = bp;
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pthread_mutex_lock(&fqp->mtx);
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if (fqp->first != NULL) {
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fqp->first->prev = ip;
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} else {
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fqp->last = ip;
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}
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fqp->first = ip;
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fqp->length += 1;
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if (fqp->length >= fqp->wakeup_len) {
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pthread_cond_signal(&fqp->cvar);
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}
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pthread_mutex_unlock(&fqp->mtx);
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}
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#if defined(NOTYET)
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int
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mkuz_fqueue_enq_all(struct mkuz_fifo_queue *fqp, struct mkuz_bchain_link *cip_f,
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struct mkuz_bchain_link *cip_l, int clen)
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{
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int rval;
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pthread_mutex_lock(&fqp->mtx);
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if (fqp->first != NULL) {
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fqp->first->prev = cip_l;
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} else {
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fqp->last = cip_l;
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}
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fqp->first = cip_f;
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fqp->length += clen;
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rval = fqp->length;
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if (fqp->length >= fqp->wakeup_len) {
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pthread_cond_signal(&fqp->cvar);
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}
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pthread_mutex_unlock(&fqp->mtx);
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return (rval);
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}
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#endif
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static int
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mkuz_fqueue_check(struct mkuz_fifo_queue *fqp, cmp_cb_t cmp_cb, void *cap)
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{
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struct mkuz_bchain_link *ip;
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for (ip = fqp->last; ip != NULL; ip = ip->prev) {
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if (cmp_cb(ip->this, cap)) {
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return (1);
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}
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}
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return (0);
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}
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struct mkuz_blk *
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mkuz_fqueue_deq_when(struct mkuz_fifo_queue *fqp, cmp_cb_t cmp_cb, void *cap)
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{
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struct mkuz_bchain_link *ip, *newlast, *newfirst, *mip;
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struct mkuz_blk *bp;
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pthread_mutex_lock(&fqp->mtx);
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while (fqp->last == NULL || !mkuz_fqueue_check(fqp, cmp_cb, cap)) {
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pthread_cond_wait(&fqp->cvar, &fqp->mtx);
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}
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if (cmp_cb(fqp->last->this, cap)) {
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mip = fqp->last;
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fqp->last = mip->prev;
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if (fqp->last == NULL) {
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#if defined(MKUZ_DEBUG)
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assert(fqp->length == 1);
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#endif
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fqp->first = NULL;
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}
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} else {
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#if defined(MKUZ_DEBUG)
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assert(fqp->length > 1);
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#endif
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newfirst = newlast = fqp->last;
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mip = NULL;
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for (ip = fqp->last->prev; ip != NULL; ip = ip->prev) {
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if (cmp_cb(ip->this, cap)) {
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mip = ip;
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continue;
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}
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newfirst->prev = ip;
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newfirst = ip;
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}
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newfirst->prev = NULL;
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fqp->first = newfirst;
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fqp->last = newlast;
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}
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fqp->length -= 1;
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pthread_mutex_unlock(&fqp->mtx);
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bp = mip->this;
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free(mip);
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return bp;
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}
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struct mkuz_blk *
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mkuz_fqueue_deq(struct mkuz_fifo_queue *fqp)
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{
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struct mkuz_bchain_link *ip;
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struct mkuz_blk *bp;
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pthread_mutex_lock(&fqp->mtx);
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while (fqp->last == NULL) {
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pthread_cond_wait(&fqp->cvar, &fqp->mtx);
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}
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#if defined(MKUZ_DEBUG)
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assert(fqp->length > 0);
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#endif
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ip = fqp->last;
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fqp->last = ip->prev;
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if (fqp->last == NULL) {
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#if defined(MKUZ_DEBUG)
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assert(fqp->length == 1);
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#endif
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fqp->first = NULL;
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}
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fqp->length -= 1;
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pthread_mutex_unlock(&fqp->mtx);
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bp = ip->this;
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free(ip);
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return bp;
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}
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#if defined(NOTYET)
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struct mkuz_bchain_link *
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mkuz_fqueue_deq_all(struct mkuz_fifo_queue *fqp, int *rclen)
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{
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struct mkuz_bchain_link *rchain;
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pthread_mutex_lock(&fqp->mtx);
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while (fqp->last == NULL) {
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pthread_cond_wait(&fqp->cvar, &fqp->mtx);
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}
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#if defined(MKUZ_DEBUG)
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assert(fqp->length > 0);
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#endif
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rchain = fqp->last;
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fqp->first = fqp->last = NULL;
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*rclen = fqp->length;
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fqp->length = 0;
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pthread_mutex_unlock(&fqp->mtx);
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return (rchain);
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}
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#endif
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