diff options
Diffstat (limited to 'usr.bin/mkuzip/mkuz_fqueue.c')
-rw-r--r-- | usr.bin/mkuzip/mkuz_fqueue.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/usr.bin/mkuzip/mkuz_fqueue.c b/usr.bin/mkuzip/mkuz_fqueue.c new file mode 100644 index 0000000..db47a05 --- /dev/null +++ b/usr.bin/mkuzip/mkuz_fqueue.c @@ -0,0 +1,214 @@ +/* + * 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 |