mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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71 lines
2.2 KiB
C++
71 lines
2.2 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 2014-2022, Institute for Automation of Complex Power Systems, EONERC
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* @license Apache 2.0
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*********************************************************************************/
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#pragma once
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#include <pthread.h>
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#include <villas/queue.h>
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#include <villas/node/config.hpp>
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namespace villas {
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namespace node {
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enum class QueueSignalledMode {
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AUTO, /**< We will choose the best method available on the platform */
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PTHREAD,
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POLLING,
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#ifdef HAS_EVENTFD
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EVENTFD,
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#endif
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};
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enum class QueueSignalledFlags {
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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 CQueueSignalled {
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struct CQueue queue; /**< Actual underlying queue. */
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enum QueueSignalledMode mode;
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enum QueueSignalledFlags flags;
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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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#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 CQueueSignalled *qs, size_t size = DEFAULT_QUEUE_LENGTH, struct memory::Type *mem = memory::default_type, enum QueueSignalledMode mode = QueueSignalledMode::AUTO, int flags = 0) __attribute__ ((warn_unused_result));
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int queue_signalled_destroy(struct CQueueSignalled *qs) __attribute__ ((warn_unused_result));
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int queue_signalled_push(struct CQueueSignalled *qs, void *ptr) __attribute__ ((warn_unused_result));
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int queue_signalled_pull(struct CQueueSignalled *qs, void **ptr) __attribute__ ((warn_unused_result));
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int queue_signalled_push_many(struct CQueueSignalled *qs, void *ptr[], size_t cnt) __attribute__ ((warn_unused_result));
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int queue_signalled_pull_many(struct CQueueSignalled *qs, void *ptr[], size_t cnt) __attribute__ ((warn_unused_result));
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int queue_signalled_close(struct CQueueSignalled *qs) __attribute__ ((warn_unused_result));
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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 CQueueSignalled *qs);
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} /* namespace node */
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} /* namespace villas */
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