mirror of
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4b6675a6f8
contributed, and main development is happening in the FreeBSD repo. Suggested by: joel
199 lines
4.6 KiB
C
199 lines
4.6 KiB
C
/*-
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* Copyright (c) 2006, Maxime Henrion <mux@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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* $FreeBSD$
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*/
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#include <assert.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <string.h>
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#include "fixups.h"
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#include "misc.h"
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#include "queue.h"
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/*
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* A synchronized queue to implement fixups. The updater thread adds
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* fixup requests to the queue with fixups_put() when a checksum
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* mismatch error occured. It then calls fixups_close() when he's
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* done requesting fixups. The detailer thread gets the fixups with
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* fixups_get() and then send the requests to the server.
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*
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* The queue is synchronized with a mutex and a condition variable.
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*/
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struct fixups {
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pthread_mutex_t lock;
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pthread_cond_t cond;
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STAILQ_HEAD(, fixup) fixupq;
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struct fixup *cur;
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size_t size;
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int closed;
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};
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static void fixups_lock(struct fixups *);
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static void fixups_unlock(struct fixups *);
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static struct fixup *fixup_new(struct coll *, const char *);
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static void fixup_free(struct fixup *);
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static void
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fixups_lock(struct fixups *f)
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{
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int error;
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error = pthread_mutex_lock(&f->lock);
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assert(!error);
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}
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static void
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fixups_unlock(struct fixups *f)
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{
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int error;
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error = pthread_mutex_unlock(&f->lock);
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assert(!error);
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}
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static struct fixup *
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fixup_new(struct coll *coll, const char *name)
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{
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struct fixup *fixup;
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fixup = xmalloc(sizeof(struct fixup));
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fixup->f_name = xstrdup(name);
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fixup->f_coll = coll;
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return (fixup);
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}
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static void
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fixup_free(struct fixup *fixup)
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{
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free(fixup->f_name);
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free(fixup);
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}
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/* Create a new fixup queue. */
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struct fixups *
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fixups_new(void)
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{
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struct fixups *f;
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f = xmalloc(sizeof(struct fixups));
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f->size = 0;
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f->closed = 0;
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f->cur = NULL;
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STAILQ_INIT(&f->fixupq);
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pthread_mutex_init(&f->lock, NULL);
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pthread_cond_init(&f->cond, NULL);
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return (f);
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}
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/* Add a fixup request to the queue. */
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void
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fixups_put(struct fixups *f, struct coll *coll, const char *name)
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{
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struct fixup *fixup;
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int dosignal;
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dosignal = 0;
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fixup = fixup_new(coll, name);
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fixups_lock(f);
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assert(!f->closed);
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STAILQ_INSERT_TAIL(&f->fixupq, fixup, f_link);
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if (f->size++ == 0)
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dosignal = 1;
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fixups_unlock(f);
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if (dosignal)
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pthread_cond_signal(&f->cond);
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}
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/* Get a fixup request from the queue. */
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struct fixup *
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fixups_get(struct fixups *f)
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{
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struct fixup *fixup, *tofree;
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fixups_lock(f);
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while (f->size == 0 && !f->closed)
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pthread_cond_wait(&f->cond, &f->lock);
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if (f->closed) {
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fixups_unlock(f);
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return (NULL);
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}
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assert(f->size > 0);
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fixup = STAILQ_FIRST(&f->fixupq);
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tofree = f->cur;
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f->cur = fixup;
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STAILQ_REMOVE_HEAD(&f->fixupq, f_link);
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f->size--;
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fixups_unlock(f);
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if (tofree != NULL)
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fixup_free(tofree);
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return (fixup);
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}
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/* Close the writing end of the queue. */
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void
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fixups_close(struct fixups *f)
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{
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int dosignal;
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dosignal = 0;
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fixups_lock(f);
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if (f->size == 0 && !f->closed)
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dosignal = 1;
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f->closed = 1;
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fixups_unlock(f);
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if (dosignal)
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pthread_cond_signal(&f->cond);
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}
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/* Free a fixups queue. */
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void
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fixups_free(struct fixups *f)
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{
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struct fixup *fixup, *fixup2;
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assert(f->closed);
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/*
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* Free any fixup that has been left on the queue.
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* This can happen if we have been aborted prematurely.
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*/
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fixup = STAILQ_FIRST(&f->fixupq);
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while (fixup != NULL) {
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fixup2 = STAILQ_NEXT(fixup, f_link);
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fixup_free(fixup);
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fixup = fixup2;
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}
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if (f->cur != NULL)
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fixup_free(f->cur);
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pthread_cond_destroy(&f->cond);
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pthread_mutex_destroy(&f->lock);
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free(f);
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}
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