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121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
/** The internal datastructure for a sample of simulation data.
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*
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* @author Steffen Vogel <stvogel@eonerc.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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#include <string.h>
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#include "pool.h"
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#include "sample.h"
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#include "utils.h"
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int sample_alloc(struct pool *p, struct sample *smps[], int cnt)
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{
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int ret;
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ret = pool_get_many(p, (void **) smps, cnt);
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if (ret < 0)
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return ret;
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for (int i = 0; i < ret; i++) {
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smps[i]->capacity = (p->blocksz - sizeof(**smps)) / sizeof(smps[0]->data[0]);
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smps[i]->pool_off = (char *) p - (char *) smps[i];
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smps[i]->format = 0; /* all sample values are float by default */
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smps[i]->refcnt = ATOMIC_VAR_INIT(1);
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}
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return ret;
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}
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void sample_free(struct sample *smps[], int cnt)
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{
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for (int i = 0; i < cnt; i++) {
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struct pool *p = (struct pool *) ((char *) smps[i] + smps[i]->pool_off);
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pool_put(p, smps[i]);
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}
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}
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int sample_put_many(struct sample *smps[], int cnt)
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{
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int released = 0;
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for (int i = 0; i < cnt; i++) {
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if (sample_put(smps[i]) == 0)
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released++;
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}
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return released;
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}
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int sample_get_many(struct sample *smps[], int cnt)
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{
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for (int i = 0; i < cnt; i++)
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sample_get(smps[i]);
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return cnt;
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}
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int sample_get(struct sample *s)
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{
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return atomic_fetch_add(&s->refcnt, 1) + 1;
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}
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int sample_put(struct sample *s)
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{
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int prev = atomic_fetch_sub(&s->refcnt, 1);
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/* Did we had the last reference? */
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if (prev == 1) {
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struct pool *p = (struct pool *) ((char *) s + s->pool_off);
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pool_put(p, s);
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}
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return prev - 1;
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}
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int sample_copy(struct sample *dst, struct sample *src)
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{
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dst->length = MIN(src->length, dst->capacity);
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dst->sequence = src->sequence;
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dst->format = src->format;
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dst->source = src->source;
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dst->ts.origin = src->ts.origin;
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dst->ts.received = src->ts.received;
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dst->ts.sent = src->ts.sent;
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memcpy(&dst->data, &src->data, SAMPLE_DATA_LEN(dst->length));
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return 0;
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}
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int sample_copy_many(struct sample *dsts[], struct sample *srcs[], int cnt)
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{
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for (int i = 0; i < cnt; i++)
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sample_copy(dsts[i], srcs[i]);
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return cnt;
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}
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int sample_set_data_format(struct sample *s, int idx, enum sample_data_format fmt)
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{
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if (idx >= sizeof(s->format) * 8)
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return 0; /* we currently can only control the format of the first 64 values. */
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switch (fmt) {
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case SAMPLE_DATA_FORMAT_FLOAT: s->format &= ~(1 << idx); break;
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case SAMPLE_DATA_FORMAT_INT: s->format |= (fmt << idx); break;
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}
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return 0;
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}
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int sample_get_data_format(struct sample *s, int idx)
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{
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if (idx >= sizeof(s->format) * 8)
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return -1; /* we currently can only control the format of the first 64 values. */
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return (s->format >> idx) & 0x1;
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}
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