From d18fa76ddd8137ca4d54073d4e12c4c15ecdf43f Mon Sep 17 00:00:00 2001
From: Arman Bilge <armanbilge@gmail.com>
Date: Tue, 20 Dec 2022 04:03:55 +0000
Subject: [PATCH] Add some uncancelables

---
 .../cats/effect/unsafe/EpollSystem.scala      | 96 ++++++++++---------
 1 file changed, 50 insertions(+), 46 deletions(-)

diff --git a/core/native/src/main/scala/cats/effect/unsafe/EpollSystem.scala b/core/native/src/main/scala/cats/effect/unsafe/EpollSystem.scala
index 314c51f492..d7243a441c 100644
--- a/core/native/src/main/scala/cats/effect/unsafe/EpollSystem.scala
+++ b/core/native/src/main/scala/cats/effect/unsafe/EpollSystem.scala
@@ -109,58 +109,62 @@ object EpollSystem extends PollingSystem {
 
     def pollReadRec[A, B](a: A)(f: A => IO[Either[A, B]]): IO[B] =
       readSemaphore.permit.surround {
-        def go(a: A, before: Int): IO[B] =
-          f(a).flatMap {
-            case Left(a) =>
-              IO(readReadyCounter).flatMap { after =>
-                if (before != after)
-                  // there was a read-ready notification since we started, try again immediately
-                  go(a, after)
-                else
-                  IO.async[Int] { cb =>
-                    IO {
-                      readCallback = cb
-                      // check again before we suspend
-                      val now = readReadyCounter
-                      if (now != before) {
-                        cb(Right(now))
-                        readCallback = null
-                        None
-                      } else Some(IO(this.readCallback = null))
-                    }
-                  }.flatMap(go(a, _))
-              }
-            case Right(b) => IO.pure(b)
-          }
+        IO.uncancelable { poll =>
+          def go(a: A, before: Int): IO[B] =
+            poll(f(a)).flatMap {
+              case Left(a) =>
+                IO(readReadyCounter).flatMap { after =>
+                  if (before != after)
+                    // there was a read-ready notification since we started, try again immediately
+                    go(a, after)
+                  else
+                    poll(IO.async[Int] { cb =>
+                      IO {
+                        readCallback = cb
+                        // check again before we suspend
+                        val now = readReadyCounter
+                        if (now != before) {
+                          cb(Right(now))
+                          readCallback = null
+                          None
+                        } else Some(IO(this.readCallback = null))
+                      }
+                    }).flatMap(go(a, _))
+                }
+              case Right(b) => IO.pure(b)
+            }
+        }
 
         IO(readReadyCounter).flatMap(go(a, _))
       }
 
     def pollWriteRec[A, B](a: A)(f: A => IO[Either[A, B]]): IO[B] =
       writeSemaphore.permit.surround {
-        def go(a: A, before: Int): IO[B] =
-          f(a).flatMap {
-            case Left(a) =>
-              IO(writeReadyCounter).flatMap { after =>
-                if (before != after)
-                  // there was a write-ready notification since we started, try again immediately
-                  go(a, after)
-                else
-                  IO.async[Int] { cb =>
-                    IO {
-                      writeCallback = cb
-                      // check again before we suspend
-                      val now = writeReadyCounter
-                      if (now != before) {
-                        cb(Right(now))
-                        writeCallback = null
-                        None
-                      } else Some(IO(this.writeCallback = null))
-                    }
-                  }.flatMap(go(a, _))
-              }
-            case Right(b) => IO.pure(b)
-          }
+        IO.uncancelable { poll =>
+          def go(a: A, before: Int): IO[B] =
+            poll(f(a)).flatMap {
+              case Left(a) =>
+                IO(writeReadyCounter).flatMap { after =>
+                  if (before != after)
+                    // there was a write-ready notification since we started, try again immediately
+                    go(a, after)
+                  else
+                    poll(IO.async[Int] { cb =>
+                      IO {
+                        writeCallback = cb
+                        // check again before we suspend
+                        val now = writeReadyCounter
+                        if (now != before) {
+                          cb(Right(now))
+                          writeCallback = null
+                          None
+                        } else Some(IO(this.writeCallback = null))
+                      }
+                    }).flatMap(go(a, _))
+                }
+              case Right(b) => IO.pure(b)
+            }
+        }
 
         IO(writeReadyCounter).flatMap(go(a, _))
       }