anil.recoil.org
The unpac monorepo manager self-hosting as a monorepo using unpac
Merge pull request #806 from dialohq/main
Prioritize returning Fiber.any value over cancelling quickly
authored by
Thomas Leonard
and committed by
GitHub
62b9714f
1dce15f1
+2
-2
lib_eio/core/fiber.ml
+2
-2
lib_eio/core/fiber.ml
···
150
150
)
151
151
in
152
152
match !r, Cancel.get_error parent_c with
153
-
| OK r, None -> r
154
-
| (OK _ | New), Some ex -> raise ex
153
+
| OK r, _ -> r
154
+
| New, Some ex -> raise ex
155
155
| Ex (ex, bt), None -> Printexc.raise_with_backtrace ex bt
156
156
| Ex ex1, Some ex2 ->
157
157
let bt2 = Printexc.get_raw_backtrace () in
+6
-4
tests/fiber.md
+6
-4
tests/fiber.md
···
191
191
Exception: Failure "Parent cancel".
192
192
```
193
193
194
-
Cancelled from parent while already cancelling:
194
+
Cancelled from parent while already cancelling
195
+
(we return the value despite the cancellation):
195
196
196
197
```ocaml
197
198
# run @@ fun () ->
198
199
Fiber.both
199
200
(fun () ->
200
-
let _ = Fiber.first
201
+
traceln "%s" @@ Fiber.first
201
202
(fun () -> "a")
202
-
(fun () -> Fiber.yield (); failwith "cancel-b")
203
-
in
203
+
(fun () -> Fiber.yield (); failwith "cancel-b");
204
+
Fiber.check ();
204
205
traceln "Parent cancel failed"
205
206
)
206
207
(fun () -> traceln "Cancelling parent"; failwith "Parent cancel");
207
208
"not-reached";;
208
209
+Cancelling parent
210
+
+a
209
211
Exception: Failure "Parent cancel".
210
212
```
211
213