-struct lttng_counter_dimension;
-
-struct lttng_counter_ops {
- 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);
- void (*counter_destroy)(struct lib_counter *counter);
- int (*counter_add)(struct lib_counter *counter,
- const size_t *dimension_indexes, int64_t v);
- int (*counter_read)(struct lib_counter *counter,
- const size_t *dimension_indexes, int cpu,
- int64_t *value, bool *overflow, bool *underflow);
- int (*counter_aggregate)(struct lib_counter *counter,
- const size_t *dimension_indexes, int64_t *value,
- bool *overflow, bool *underflow);
- int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
-};
-
-#define LTTNG_UST_STACK_CTX_PADDING 32
-struct lttng_stack_ctx {
- struct lttng_event *event;
- struct lttng_ctx *chan_ctx; /* RCU dereferenced. */
- struct lttng_ctx *event_ctx; /* RCU dereferenced. */
- char padding[LTTNG_UST_STACK_CTX_PADDING];
-};
-
-#define LTTNG_UST_EVENT_HT_BITS 12
-#define LTTNG_UST_EVENT_HT_SIZE (1U << LTTNG_UST_EVENT_HT_BITS)
-
-struct lttng_ust_event_ht {
- struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE];
-};
-
-#define LTTNG_UST_EVENT_NOTIFIER_HT_BITS 12
-#define LTTNG_UST_EVENT_NOTIFIER_HT_SIZE (1U << LTTNG_UST_EVENT_NOTIFIER_HT_BITS)
-struct lttng_ust_event_notifier_ht {
- struct cds_hlist_head table[LTTNG_UST_EVENT_NOTIFIER_HT_SIZE];
-};
+/*
+ * IMPORTANT: this structure is part of the ABI between the probe and
+ * UST. Fields need to be only added at the end, never reordered, never
+ * removed.
+ *
+ * The field @struct_size should be used to determine the size of the
+ * structure. It should be queried before using additional fields added
+ * at the end of the structure.
+ */
+struct lttng_ust_stack_ctx {
+ uint32_t struct_size; /* Size of this structure */