From 01de71981b45d59c059864cd3b071b6e6449a167 Mon Sep 17 00:00:00 2001
From: Matthew Flatt <mflatt@racket-lang.org>
Date: Wed, 25 Sep 2019 09:15:53 -0600
Subject: [PATCH] unsafe-poller: remove overly-conservative false positives

Trying to be more helpful about the thread running an `unsafe-poller`
callback gets in the way of making the process sleep when multiple
threads are blocked on unsafe pollers.

Closes #2833
---
 racket/src/racket/src/struct.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/racket/src/racket/src/struct.c b/racket/src/racket/src/struct.c
index d75f84dbd7..14ae50d51b 100644
--- a/racket/src/racket/src/struct.c
+++ b/racket/src/racket/src/struct.c
@@ -1565,11 +1565,6 @@ static int evt_struct_is_ready(Scheme_Object *o, Scheme_Schedule_Info *sinfo)
 {
   Scheme_Object *v;
 
-  if (sinfo->false_positive_ok) {
-    sinfo->potentially_false_positive = 1;
-    return 1;
-  }
-
   v = scheme_struct_type_property_ref(evt_property, o);
 
   if (!v) {
@@ -3857,12 +3852,6 @@ static int chaperone_evt_is_ready(Scheme_Object *obj, Scheme_Schedule_Info *sinf
   Scheme_Chaperone *px;
   int redirected = 0;
 
-  if (sinfo->false_positive_ok) {
-    /* Safer, though maybe unnecessarily conservative: */
-    sinfo->potentially_false_positive = 1;
-    return 1;
-  }
-
   while (SCHEME_CHAPERONEP(o)) {
     px = (Scheme_Chaperone *)o;
     if (SAME_TYPE(SCHEME_TYPE(px->redirects), scheme_nack_guard_evt_type)) {