mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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50 lines
No EOL
1.5 KiB
C
50 lines
No EOL
1.5 KiB
C
/** Node-type for shared memory communication.
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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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*********************************************************************************/
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/**
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* @ingroup node
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* @addtogroup shmem Shared memory interface
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* @{
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*/
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#pragma once
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#include "node.h"
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#include "memory.h"
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#include "pool.h"
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#include "queue.h"
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#include "shmem.h"
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#define DEFAULT_SHMEM_QUEUESIZE 512
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struct shmem {
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const char* name; /**< Name of the shm object. */
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int sample_size; /**< Number of data entries for each sample. */
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int insize, outsize; /**< Size of ingoing and outgoing queue, respectively. */
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int cond_out; /**< Whether to use a pthread_cond_t to signal if new samples are written to outqueue. */
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int cond_in; /**< Whether to use a pthread_cond_t to signal if new samples are written to inqueue. */
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char **exec; /**< External program to execute on start. */
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struct memtype *manager; /**< Manager for the shared memory region. */
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int fd; /**< Handle as returned by shm_open().*/
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void *base; /**< Pointer to the shared memory region. */
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struct shmem_shared *shared; /**< Shared datastructure. */
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};
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char *shmem_print(struct node *n);
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int shmem_parse(struct node *n, config_setting_t *cfg);
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int shmem_open(struct node *n);
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int shmem_close(struct node *n);
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int shmem_read(struct node *n, struct sample *smps[], unsigned cnt);
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int shmem_write(struct node *n, struct sample *smps[], unsigned cnt);
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/** @} */ |