Implement libcounter

[deliverable/lttng-ust.git] / liblttng-ust / lttng-counter-client-percpu-32-modular.c

diff --git a/liblttng-ust/lttng-counter-client-percpu-32-modular.c b/liblttng-ust/lttng-counter-client-percpu-32-modular.c
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+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
+ * lttng-counter-client-percpu-32-modular.c
+ *
+ * LTTng lib counter client. Per-cpu 32-bit counters in modular
+ * arithmetic.
+ *
+ * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#include <lttng/ust-events.h>
+#include "../libcounter/counter.h"
+#include "../libcounter/counter-api.h"
+
+static const struct lib_counter_config client_config = {
+       .alloc = COUNTER_ALLOC_PER_CPU,
+       .sync = COUNTER_SYNC_PER_CPU,
+       .arithmetic = COUNTER_ARITHMETIC_MODULAR,
+       .counter_size = COUNTER_SIZE_32_BIT,
+};
+
+static struct lib_counter *counter_create(size_t nr_dimensions,
+                                         const struct lttng_counter_dimension *dimensions,
+                                         int64_t global_sum_step,
+                                         int global_counter_fd,
+                                         int nr_counter_cpu_fds,
+                                         const int *counter_cpu_fds,
+                                         bool is_daemon)
+{
+       size_t max_nr_elem[LTTNG_COUNTER_DIMENSION_MAX], i;
+
+       if (nr_dimensions > LTTNG_COUNTER_DIMENSION_MAX)
+               return NULL;
+       for (i = 0; i < nr_dimensions; i++) {
+               if (dimensions[i].has_underflow || dimensions[i].has_overflow)
+                       return NULL;
+               max_nr_elem[i] = dimensions[i].size;
+       }
+       return lttng_counter_create(&client_config, nr_dimensions, max_nr_elem,
+                                   global_sum_step, global_counter_fd, nr_counter_cpu_fds,
+                                   counter_cpu_fds, is_daemon);
+}
+
+static void counter_destroy(struct lib_counter *counter)
+{
+       lttng_counter_destroy(counter);
+}
+
+static int counter_add(struct lib_counter *counter, const size_t *dimension_indexes, int64_t v)
+{
+       return lttng_counter_add(&client_config, counter, dimension_indexes, v);
+}
+
+static int counter_read(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
+                       int64_t *value, bool *overflow, bool *underflow)
+{
+       return lttng_counter_read(&client_config, counter, dimension_indexes, cpu, value,
+                                 overflow, underflow);
+}
+
+static int counter_aggregate(struct lib_counter *counter, const size_t *dimension_indexes,
+                            int64_t *value, bool *overflow, bool *underflow)
+{
+       return lttng_counter_aggregate(&client_config, counter, dimension_indexes, value,
+                                      overflow, underflow);
+}
+
+static int counter_clear(struct lib_counter *counter, const size_t *dimension_indexes)
+{
+       return lttng_counter_clear(&client_config, counter, dimension_indexes);
+}
+
+static struct lttng_counter_transport lttng_counter_transport = {
+       .name = "counter-per-cpu-32-modular",
+       .ops = {
+               .counter_create = counter_create,
+               .counter_destroy = counter_destroy,
+               .counter_add = counter_add,
+               .counter_read = counter_read,
+               .counter_aggregate = counter_aggregate,
+               .counter_clear = counter_clear,
+       },
+       .client_config = &client_config,
+};
+
+void lttng_counter_client_percpu_32_modular_init(void)
+{
+       lttng_counter_transport_register(&lttng_counter_transport);
+}
+
+void lttng_counter_client_percpu_32_modular_exit(void)
+{
+       lttng_counter_transport_unregister(&lttng_counter_transport);
+}