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-rw-r--r--erts/emulator/beam/erl_thr_queue.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_thr_queue.c b/erts/emulator/beam/erl_thr_queue.c
index 7ff456b915..30c9d70c59 100644
--- a/erts/emulator/beam/erl_thr_queue.c
+++ b/erts/emulator/beam/erl_thr_queue.c
@@ -780,3 +780,35 @@ erts_thr_q_dequeue(ErtsThrQ_t *q)
return res;
#endif
}
+
+#ifdef USE_LTTNG_VM_TRACEPOINTS
+int
+erts_thr_q_length_dirty(ErtsThrQ_t *q)
+{
+ int n = 0;
+#ifndef USE_THREADS
+ void *res;
+ ErtsThrQElement_t *tmp;
+
+ for (tmp = q->first; tmp != NULL; tmp = tmp->next) {
+ n++;
+ }
+#else
+ ErtsThrQElement_t *e;
+ erts_aint_t inext;
+
+ e = ErtsThrQDirtyReadEl(&q->head.head);
+ inext = erts_atomic_read_acqb(&e->next);
+
+ while (inext != ERTS_AINT_NULL) {
+ e = (ErtsThrQElement_t *) inext;
+ if (e != &q->tail.data.marker) {
+ /* don't count marker */
+ n++;
+ }
+ inext = erts_atomic_read_acqb(&e->next);
+ }
+#endif
+ return n;
+}
+#endif