freebsd-dev/usr.bin/mkuzip/mkuz_fqueue.c

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