* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#define _LGPL_SOURCE
#include <sys/types.h>
#include <unistd.h>
#include <lttng/ust-events.h>
*/
void lttng_context_vtid_reset(void)
{
- URCU_TLS(cached_vtid) = 0;
+ CMM_STORE_SHARED(URCU_TLS(cached_vtid), 0);
}
static
-size_t vtid_get_size(size_t offset)
+size_t vtid_get_size(struct lttng_ctx_field *field, size_t offset)
{
size_t size = 0;
return size;
}
+static inline
+pid_t wrapper_getvtid(void)
+{
+ pid_t vtid;
+
+ vtid = CMM_LOAD_SHARED(URCU_TLS(cached_vtid));
+ if (caa_unlikely(!vtid)) {
+ vtid = getpid();
+ CMM_STORE_SHARED(URCU_TLS(cached_vtid), vtid);
+ }
+ return vtid;
+}
+
static
void vtid_record(struct lttng_ctx_field *field,
struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
- if (caa_unlikely(!URCU_TLS(cached_vtid)))
- URCU_TLS(cached_vtid) = gettid();
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(URCU_TLS(cached_vtid)));
- chan->ops->event_write(ctx, &URCU_TLS(cached_vtid),
- sizeof(URCU_TLS(cached_vtid)));
+ pid_t vtid = wrapper_getvtid();
+
+ lib_ring_buffer_align_ctx(ctx, lttng_alignof(vtid));
+ chan->ops->event_write(ctx, &vtid, sizeof(vtid));
}
static
void vtid_get_value(struct lttng_ctx_field *field,
- union lttng_ctx_value *value)
+ struct lttng_ctx_value *value)
{
- if (caa_unlikely(!URCU_TLS(cached_vtid)))
- URCU_TLS(cached_vtid) = gettid();
- value->s64 = URCU_TLS(cached_vtid);
+ value->u.s64 = wrapper_getvtid();
}
int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx)