Avoid enqueueing the same ISeq twice

by a race condition by multiple Ractors.

Atmically incrementing body->total_calls may have its own cost, so for
now we intentionally leave the unreliable total_calls. So we allow an
ISeq to be never pushed when you use multiple Ractors. However, if you
enqueue a single ccan node twice, get_from_list loops infinitely. Thus
this patch takes care of such a situation.

1 files changed, 1 insertions, 1 deletions

diff --git a/mjit.h b/mjit.h
index 8cfc3d05b7..4d27e39e3c 100644
--- a/mjit.h
+++ b/mjit.h
@@ -20,7 +20,7 @@
 // Special address values of a function generated from the
 // corresponding iseq by MJIT:
 enum rb_mjit_iseq_func {
-    // ISEQ was not queued yet for the machine code generation
+    // ISEQ has never been enqueued to unit_queue yet
     NOT_ADDED_JIT_ISEQ_FUNC = 0,
     // ISEQ is already queued for the machine code generation but the
     // code is not ready yet for the execution