mirror of https://gerrit.osmocom.org/libosmocore
Add inter-thread queue
This adds an inter-thread queue "it_q" to libosmocore. With it_q, one can perform thread-safe enqueing of messages to another thread, who will receive the related messages triggered via an eventfd handled in the usual libosmocore select loop abstraction. Change-Id: Ie7d0c5fec715a2a577fae014b0b8a0e9c38418ef
This commit is contained in:
parent
463dca0b9c
commit
e4cd267ab1
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@ -62,7 +62,7 @@ AC_SUBST(LTLDFLAGS_OSMOCTRL)
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dnl checks for header files
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AC_HEADER_STDC
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AC_CHECK_HEADERS(execinfo.h poll.h sys/select.h sys/socket.h sys/signalfd.h sys/timerfd.h syslog.h ctype.h netinet/tcp.h netinet/in.h)
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AC_CHECK_HEADERS(execinfo.h poll.h sys/select.h sys/socket.h sys/signalfd.h sys/eventfd.h sys/timerfd.h syslog.h ctype.h netinet/tcp.h netinet/in.h)
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# for src/conv.c
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AC_FUNC_ALLOCA
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AC_SEARCH_LIBS([dlopen], [dl dld], [LIBRARY_DLOPEN="$LIBS";LIBS=""])
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@ -30,6 +30,7 @@ nobase_include_HEADERS = \
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osmocom/core/hash.h \
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osmocom/core/hashtable.h \
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osmocom/core/isdnhdlc.h \
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osmocom/core/it_q.h \
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osmocom/core/linuxlist.h \
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osmocom/core/linuxrbtree.h \
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osmocom/core/log2.h \
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@ -0,0 +1,62 @@
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#pragma once
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/select.h>
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#include <pthread.h>
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/*! \defgroup osmo_it_q Inter-Thread Queue
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* @{
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* \file osmo_it_q.h */
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/*! One instance of an inter-thread queue. The user can use this to queue messages
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* between different threads. The enqueue operation is non-blocking (but of course
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* grabs a mutex for the actual list operations to safeguard against races). The
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* receiving thread is woken up by an event_fd which can be registered in the libosmocore
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* select loop handling. */
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struct osmo_it_q {
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/* entry in global list of message queues */
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struct llist_head entry;
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/* the actual list of user structs. HEAD: first in queue; TAIL: last in queue */
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struct llist_head list;
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/* A pthread mutex to safeguard accesses to the queue. No rwlock as we always write. */
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pthread_mutex_t mutex;
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/* Current count of messages in the queue */
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unsigned int current_length;
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/* osmo-fd wrapped eventfd */
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struct osmo_fd event_ofd;
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/* a user-defined name for this queue */
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const char *name;
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/* maximum permitted length of queue */
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unsigned int max_length;
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/* read call-back, called for each de-queued message */
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void (*read_cb)(struct osmo_it_q *q, struct llist_head *item);
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/* opaque data pointer passed through to call-back function */
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void *data;
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};
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struct osmo_it_q *osmo_it_q_by_name(const char *name);
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int _osmo_it_q_enqueue(struct osmo_it_q *queue, struct llist_head *item);
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#define osmo_it_q_enqueue(queue, item, member) \
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_osmo_it_q_enqueue(queue, &(item)->member)
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struct llist_head *_osmo_it_q_dequeue(struct osmo_it_q *queue);
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#define osmo_it_q_dequeue(queue, item, member) do { \
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struct llist_head *l = _osmo_it_q_dequeue(queue); \
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if (!l) \
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*item = NULL; \
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else \
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*item = llist_entry(l, typeof(**item), member); \
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} while (0)
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struct osmo_it_q *osmo_it_q_alloc(void *ctx, const char *name, unsigned int max_length,
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void (*read_cb)(struct osmo_it_q *q, struct llist_head *item),
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void *data);
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void osmo_it_q_destroy(struct osmo_it_q *q);
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void osmo_it_q_flush(struct osmo_it_q *q);
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/*! @} */
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@ -28,6 +28,7 @@ libosmocore_la_SOURCES = context.c timer.c timer_gettimeofday.c timer_clockgetti
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sockaddr_str.c \
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use_count.c \
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exec.c \
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it_q.c \
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$(NULL)
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if HAVE_SSSE3
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@ -0,0 +1,277 @@
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/*! \file it_q.c
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* Osmocom Inter-Thread queue implementation */
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/* (C) 2019 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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/*! \addtogroup it_q
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* @{
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* Inter-Thread Message Queue.
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*
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* This implements a general-purpose queue between threads. It uses
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* user-provided data types (containing a llist_head as initial member)
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* as elements in the queue and an eventfd-based notification mechanism.
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* Hence, it can be used for pretty much anything, including but not
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* limited to msgbs, including msgb-wrapped osmo_prim.
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*
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* The idea is that the sending thread simply calls osmo_it_q_enqueue().
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* The receiving thread is woken up from its osmo_select_main() loop by eventfd,
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* and a general osmo_fd callback function for the eventfd will dequeue each item
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* and call a queue-specific callback function.
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*/
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#include "../config.h"
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#ifdef HAVE_SYS_EVENTFD_H
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#include <pthread.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/eventfd.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/it_q.h>
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/* "increment" the eventfd by specified 'inc' */
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static int eventfd_increment(int fd, uint64_t inc)
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{
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int rc;
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rc = write(fd, &inc, sizeof(inc));
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if (rc != sizeof(inc))
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return -1;
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return 0;
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}
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/* global (for all threads) list of message queues in a program + associated lock */
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static LLIST_HEAD(it_queues);
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static pthread_rwlock_t it_queues_rwlock = PTHREAD_RWLOCK_INITIALIZER;
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/* resolve it-queue by its [globally unique] name; must be called with rwlock held */
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static struct osmo_it_q *_osmo_it_q_by_name(const char *name)
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{
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struct osmo_it_q *q;
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llist_for_each_entry(q, &it_queues, entry) {
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if (!strcmp(q->name, name))
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return q;
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}
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return NULL;
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}
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/*! resolve it-queue by its [globally unique] name */
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struct osmo_it_q *osmo_it_q_by_name(const char *name)
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{
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struct osmo_it_q *q;
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pthread_rwlock_rdlock(&it_queues_rwlock);
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q = _osmo_it_q_by_name(name);
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pthread_rwlock_unlock(&it_queues_rwlock);
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return q;
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}
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/* osmo_fd call-back when eventfd is readable */
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static int osmo_it_q_fd_cb(struct osmo_fd *ofd, unsigned int what)
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{
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struct osmo_it_q *q = (struct osmo_it_q *) ofd->data;
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uint64_t val;
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int i, rc;
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if (!(what & OSMO_FD_READ))
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return 0;
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rc = read(ofd->fd, &val, sizeof(val));
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if (rc < sizeof(val))
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return rc;
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for (i = 0; i < val; i++) {
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struct llist_head *item = _osmo_it_q_dequeue(q);
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/* in case the user might have called osmo_it_q_flush() we may
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* end up in the eventfd-dispatch but without any messages left in the queue,
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* otherwise I'd have loved to OSMO_ASSERT(msg) here. */
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if (!item)
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break;
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q->read_cb(q, item);
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}
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return 0;
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}
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/*! Allocate a new inter-thread message queue.
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* \param[in] ctx talloc context from which to allocate the queue
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* \param[in] name human-readable string name of the queue; function creates a copy.
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* \param[in] read_cb call-back function to be called for each de-queued message; may be
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* NULL in case you don't want eventfd/osmo_select integration and
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* will manually take care of noticing if and when to dequeue.
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* \returns a newly-allocated inter-thread message queue; NULL in case of error */
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struct osmo_it_q *osmo_it_q_alloc(void *ctx, const char *name, unsigned int max_length,
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void (*read_cb)(struct osmo_it_q *q, struct llist_head *item),
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void *data)
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{
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struct osmo_it_q *q;
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int fd;
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q = talloc_zero(ctx, struct osmo_it_q);
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if (!q)
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return NULL;
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q->data = data;
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q->name = talloc_strdup(q, name);
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q->current_length = 0;
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q->max_length = max_length;
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q->read_cb = read_cb;
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INIT_LLIST_HEAD(&q->list);
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pthread_mutex_init(&q->mutex, NULL);
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q->event_ofd.fd = -1;
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if (q->read_cb) {
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/* create eventfd *if* the user has provided a read_cb function */
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fd = eventfd(0, 0);
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if (fd < 0) {
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talloc_free(q);
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return NULL;
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}
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/* initialize BUT NOT REGISTER the osmo_fd. The receiving thread must
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* take are to select/poll/read/... on it */
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osmo_fd_setup(&q->event_ofd, fd, OSMO_FD_READ, osmo_it_q_fd_cb, q, 0);
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}
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/* add to global list of queues, checking for duplicate names */
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pthread_rwlock_wrlock(&it_queues_rwlock);
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if (_osmo_it_q_by_name(q->name)) {
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pthread_rwlock_unlock(&it_queues_rwlock);
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if (q->event_ofd.fd >= 0)
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osmo_fd_close(&q->event_ofd);
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talloc_free(q);
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return NULL;
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}
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llist_add_tail(&q->entry, &it_queues);
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pthread_rwlock_unlock(&it_queues_rwlock);
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return q;
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}
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static void *item_dequeue(struct llist_head *queue)
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{
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struct llist_head *lh;
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if (llist_empty(queue))
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return NULL;
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lh = queue->next;
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if (lh) {
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llist_del(lh);
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return lh;
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} else
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return NULL;
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}
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/*! Flush all messages currently present in queue */
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static void _osmo_it_q_flush(struct osmo_it_q *q)
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{
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void *item;
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while ((item = item_dequeue(&q->list))) {
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talloc_free(item);
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}
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q->current_length = 0;
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}
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/*! Flush all messages currently present in queue */
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void osmo_it_q_flush(struct osmo_it_q *q)
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{
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OSMO_ASSERT(q);
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pthread_mutex_lock(&q->mutex);
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_osmo_it_q_flush(q);
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pthread_mutex_unlock(&q->mutex);
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}
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/*! Destroy a message queue */
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void osmo_it_q_destroy(struct osmo_it_q *q)
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{
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OSMO_ASSERT(q);
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/* first remove from global list of queues */
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pthread_rwlock_wrlock(&it_queues_rwlock);
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llist_del(&q->entry);
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pthread_rwlock_unlock(&it_queues_rwlock);
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/* next, close the eventfd */
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if (q->event_ofd.fd >= 0)
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osmo_fd_close(&q->event_ofd);
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/* flush all messages still present */
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osmo_it_q_flush(q);
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pthread_mutex_destroy(&q->mutex);
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/* and finally release memory */
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talloc_free(q);
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}
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/*! Thread-safe en-queue to an inter-thread message queue.
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* \param[in] queue Inter-thread queue on which to enqueue
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* \param[in] item Item to enqueue. Must have llist_head as first member!
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* \returns 0 on success; negative on error */
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int _osmo_it_q_enqueue(struct osmo_it_q *queue, struct llist_head *item)
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{
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OSMO_ASSERT(queue);
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OSMO_ASSERT(item);
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pthread_mutex_lock(&queue->mutex);
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if (queue->current_length+1 > queue->max_length) {
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pthread_mutex_unlock(&queue->mutex);
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return -ENOSPC;
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}
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llist_add_tail(item, &queue->list);
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queue->current_length++;
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pthread_mutex_unlock(&queue->mutex);
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/* increment eventfd counter by one */
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if (queue->event_ofd.fd >= 0)
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eventfd_increment(queue->event_ofd.fd, 1);
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return 0;
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}
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/*! Thread-safe de-queue from an inter-thread message queue.
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* \param[in] queue Inter-thread queue from which to dequeue
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* \returns dequeued message buffer; NULL if none available
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*/
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struct llist_head *_osmo_it_q_dequeue(struct osmo_it_q *queue)
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{
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struct llist_head *l;
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OSMO_ASSERT(queue);
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pthread_mutex_lock(&queue->mutex);
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if (llist_empty(&queue->list))
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l = NULL;
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l = queue->list.next;
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OSMO_ASSERT(l);
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llist_del(l);
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queue->current_length--;
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pthread_mutex_unlock(&queue->mutex);
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return l;
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}
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#endif /* HAVE_SYS_EVENTFD_H */
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/*! @} */
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@ -41,6 +41,7 @@ check_PROGRAMS = timer/timer_test sms/sms_test ussd/ussd_test \
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gad/gad_test \
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bsslap/bsslap_test \
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bssmap_le/bssmap_le_test \
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it_q/it_q_test \
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$(NULL)
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if ENABLE_MSGFILE
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@ -304,6 +305,9 @@ bsslap_bsslap_test_LDADD = $(LDADD) $(top_builddir)/src/gsm/libosmogsm.la
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bssmap_le_bssmap_le_test_SOURCES = bssmap_le/bssmap_le_test.c
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bssmap_le_bssmap_le_test_LDADD = $(LDADD) $(top_builddir)/src/gsm/libosmogsm.la
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it_q_it_q_test_SOURCES = it_q/it_q_test.c
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it_q_it_q_test_LDADD = $(LDADD)
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# The `:;' works around a Bash 3.2 bug when the output is not writeable.
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$(srcdir)/package.m4: $(top_srcdir)/configure.ac
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:;{ \
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gad/gad_test.ok \
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bsslap/bsslap_test.ok \
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bssmap_le/bssmap_le_test.ok \
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it_q/it_q_test.ok \
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$(NULL)
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if ENABLE_LIBSCTP
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@ -0,0 +1,119 @@
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#include <stdio.h>
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#include <errno.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/it_q.h>
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struct it_q_test1 {
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struct llist_head list;
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int *foo;
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};
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struct it_q_test2 {
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int foo;
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struct llist_head list;
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};
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#define ENTER_TC printf("\n== Entering test case %s\n", __func__)
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static void tc_alloc(void)
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{
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struct osmo_it_q *q1, *q2;
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ENTER_TC;
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printf("allocating q1\n");
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q1 = osmo_it_q_alloc(OTC_GLOBAL, "q1", 3, NULL, NULL);
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OSMO_ASSERT(q1);
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/* ensure that no duplicate allocation for the */
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printf("attempting duplicate allocation of qa\n");
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q2 = osmo_it_q_alloc(OTC_GLOBAL, "q1", 3, NULL, NULL);
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OSMO_ASSERT(!q2);
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/* ensure that same name can be re-created after destroying old one */
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osmo_it_q_destroy(q1);
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printf("re-allocating q1\n");
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q1 = osmo_it_q_alloc(OTC_GLOBAL, "q1", 3, NULL, NULL);
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OSMO_ASSERT(q1);
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osmo_it_q_destroy(q1);
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}
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static void tc_queue_length(void)
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{
|
||||
struct osmo_it_q *q1;
|
||||
unsigned int qlen = 3;
|
||||
struct it_q_test1 *item;
|
||||
int i, rc;
|
||||
|
||||
ENTER_TC;
|
||||
|
||||
printf("allocating q1\n");
|
||||
q1 = osmo_it_q_alloc(OTC_GLOBAL, "q1", qlen, NULL, NULL);
|
||||
OSMO_ASSERT(q1);
|
||||
|
||||
printf("adding queue entries up to the limit\n");
|
||||
for (i = 0; i < qlen; i++) {
|
||||
item = talloc_zero(OTC_GLOBAL, struct it_q_test1);
|
||||
rc = osmo_it_q_enqueue(q1, item, list);
|
||||
OSMO_ASSERT(rc == 0);
|
||||
}
|
||||
printf("attempting to add more than the limit\n");
|
||||
item = talloc_zero(OTC_GLOBAL, struct it_q_test1);
|
||||
rc = osmo_it_q_enqueue(q1, item, list);
|
||||
OSMO_ASSERT(rc == -ENOSPC);
|
||||
|
||||
osmo_it_q_destroy(q1);
|
||||
}
|
||||
|
||||
static int g_read_cb_count;
|
||||
|
||||
static void q_read_cb(struct osmo_it_q *q, struct llist_head *item)
|
||||
{
|
||||
struct it_q_test1 *it = container_of(item, struct it_q_test1, list);
|
||||
*it->foo += 1;
|
||||
talloc_free(item);
|
||||
}
|
||||
|
||||
static void tc_eventfd(void)
|
||||
{
|
||||
struct osmo_it_q *q1;
|
||||
unsigned int qlen = 30;
|
||||
struct it_q_test1 *item;
|
||||
int i, rc;
|
||||
|
||||
ENTER_TC;
|
||||
|
||||
printf("allocating q1\n");
|
||||
q1 = osmo_it_q_alloc(OTC_GLOBAL, "q1", qlen, q_read_cb, NULL);
|
||||
OSMO_ASSERT(q1);
|
||||
osmo_fd_register(&q1->event_ofd);
|
||||
|
||||
/* ensure read-cb isn't called unless we enqueue something */
|
||||
osmo_select_main(1);
|
||||
OSMO_ASSERT(g_read_cb_count == 0);
|
||||
|
||||
/* ensure read-cb is called for each enqueued msg once */
|
||||
printf("adding %u queue entries up to the limit\n", qlen);
|
||||
for (i = 0; i < qlen; i++) {
|
||||
item = talloc_zero(OTC_GLOBAL, struct it_q_test1);
|
||||
item->foo = &g_read_cb_count;
|
||||
rc = osmo_it_q_enqueue(q1, item, list);
|
||||
OSMO_ASSERT(rc == 0);
|
||||
}
|
||||
|
||||
osmo_select_main(1);
|
||||
printf("%u entries were dequeued\n", qlen);
|
||||
OSMO_ASSERT(g_read_cb_count == qlen);
|
||||
|
||||
osmo_it_q_destroy(q1);
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
tc_alloc();
|
||||
tc_queue_length();
|
||||
tc_eventfd();
|
||||
}
|
|
@ -0,0 +1,15 @@
|
|||
|
||||
== Entering test case tc_alloc
|
||||
allocating q1
|
||||
attempting duplicate allocation of qa
|
||||
re-allocating q1
|
||||
|
||||
== Entering test case tc_queue_length
|
||||
allocating q1
|
||||
adding queue entries up to the limit
|
||||
attempting to add more than the limit
|
||||
|
||||
== Entering test case tc_eventfd
|
||||
allocating q1
|
||||
adding 30 queue entries up to the limit
|
||||
30 entries were dequeued
|
|
@ -427,3 +427,9 @@ AT_KEYWORDS([bssmap_le])
|
|||
cat $abs_srcdir/bssmap_le/bssmap_le_test.ok > expout
|
||||
AT_CHECK([$abs_top_builddir/tests/bssmap_le/bssmap_le_test], [0], [expout], [ignore])
|
||||
AT_CLEANUP
|
||||
|
||||
AT_SETUP([it_q])
|
||||
AT_KEYWORDS([it_q])
|
||||
cat $abs_srcdir/it_q/it_q_test.ok > expout
|
||||
AT_CHECK([$abs_top_builddir/tests/it_q/it_q_test], [0], [expout], [ignore])
|
||||
AT_CLEANUP
|
||||
|
|
Loading…
Reference in New Issue