mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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Steffen Vogel
4d09482fdb
# Conflicts: # Makefile # Makefile.config # Makefile.help # lib/Makefile.villas-ext.inc # lib/Makefile.villas.inc # lib/memory.c # lib/nodes/Makefile.inc
90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/** Wrapper around queue that uses POSIX CV's for signalling writes.
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*
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* @file
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* @author Georg Martin Reinke <georg.reinke@rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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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 3 of the License, or
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* 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, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#pragma once
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#include <pthread.h>
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#include "queue.h"
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#ifdef __cplusplus
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extern "C"{
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#endif
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enum queue_signalled_flags {
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/* Mode */
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QUEUE_SIGNALLED_AUTO = (0 << 0), /**< We will choose the best method available on the platform */
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QUEUE_SIGNALLED_PTHREAD = (1 << 0),
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QUEUE_SIGNALLED_POLLING = (2 << 0),
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#ifdef HAS_EVENTFD
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QUEUE_SIGNALLED_EVENTFD = (3 << 0),
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#elif defined(__APPLE__)
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QUEUE_SIGNALLED_PIPE = (3 << 0),
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#endif
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QUEUE_SIGNALLED_MASK = 0xf,
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/* Other flags */
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QUEUE_SIGNALLED_PROCESS_SHARED = (1 << 4)
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};
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/** Wrapper around queue that uses POSIX CV's for signalling writes. */
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struct queue_signalled {
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struct queue queue; /**< Actual underlying queue. */
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enum queue_signalled_flags mode;
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union {
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struct {
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pthread_cond_t ready; /**< Condition variable to signal writes to the queue. */
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pthread_mutex_t mutex; /**< Mutex for ready. */
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} pthread;
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#ifdef __linux__
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int eventfd;
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#elif defined(__APPLE__)
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int pipe[2];
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#endif
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};
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};
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#define queue_signalled_available(q) queue_available(&((q)->queue))
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int queue_signalled_init(struct queue_signalled *qs, size_t size, struct memory_type *mem, int flags);
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int queue_signalled_destroy(struct queue_signalled *qs);
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int queue_signalled_push(struct queue_signalled *qs, void *ptr);
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int queue_signalled_pull(struct queue_signalled *qs, void **ptr);
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int queue_signalled_push_many(struct queue_signalled *qs, void *ptr[], size_t cnt);
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int queue_signalled_pull_many(struct queue_signalled *qs, void *ptr[], size_t cnt);
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int queue_signalled_close(struct queue_signalled *qs);
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/** Returns a file descriptor which can be used with poll / select to wait for new data */
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int queue_signalled_fd(struct queue_signalled *qs);
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#ifdef __cplusplus
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}
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#endif
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