build: bump vendor/nim-chronos

Also make necessary adjustments to `task_runner/[asyncloop, asyncsync]`

task_runner/asyncloop.nim

@@ -9,9 +9,9 @@
 #                    Licensed under either of
 #         Apache License, version 2.0, (LICENSE-APACHEv2)
 #                    MIT license (LICENSE-MIT)
-import os, selectors
+import os
 
-import chronos/asyncloop
+import chronos/[asyncloop, selectors2]
 export asyncloop
 
 when defined(windows):
@@ -141,22 +141,28 @@ else:
     var moment: Moment
 
     proc handleContinuation(udata: pointer) {.gcsafe.} =
+      try:
         if not(retFuture.finished()):
           loop.selector.unregister(event)
           if isNil(udata):
             retFuture.complete(false)
           else:
             retFuture.complete(true)
+      except IOSelectorsException as e:
+        raise newException(Defect, e.msg)
 
-    proc cancel(udata: pointer) {.gcsafe.} =
+    proc cancellation(udata: pointer) {.gcsafe.} =
+      try:
         if not(retFuture.finished()):
           loop.selector.unregister(event)
           if timeout != InfiniteDuration:
             removeTimer(moment, handleContinuation, nil)
+      except IOSelectorsException as e:
+        raise newException(Defect, e.msg)
 
     if timeout != InfiniteDuration:
       moment = Moment.fromNow(timeout)
-      addTimer(moment, handleContinuation, nil)
+      discard setTimer(moment, handleContinuation, nil)
 
     let fd = event.getFd()
     loop.selector.registerEvent(event, data)
@@ -170,5 +176,5 @@ else:
       retFuture.fail(newException(ValueError,
                      "Event descriptor not registered."))
 
-    retFuture.cancelCallback = cancel
+    retFuture.cancelCallback = cancellation
     return retFuture

task_runner/asyncsync.nim

@@ -11,7 +11,7 @@
 #                    MIT license (LICENSE-MIT)
 import os
 
-import chronos/[asyncloop, asyncsync, handles, timer]
+import chronos/[asyncloop, asyncsync, handles, selectors2, timer]
 export asyncsync
 
 import ./osapi
@@ -216,7 +216,8 @@ else:
     else:
       let fd = AsyncFD(event.rfd)
 
-    proc contiunuation(udata: pointer) {.gcsafe.} =
+    proc contiunuation(udata: pointer) {.gcsafe, raises: [Defect].} =
+      try:
         if not(retFuture.finished()):
           var data: uint64 = 0
           if isNil(udata):
@@ -252,11 +253,16 @@ else:
                     release(event.lock)
                 retFuture.complete(WaitSuccess)
               break
+      except IOSelectorsException, ValueError:
+        raise newException(Defect, getCurrentExceptionMsg())
 
-    proc cancel(udata: pointer) {.gcsafe.} =
+    proc cancellation(udata: pointer) {.gcsafe, raises: [Defect].} =
+      try:
         if not(retFuture.finished()):
           removeTimer(moment, contiunuation, nil)
           removeReader(fd)
+      except IOSelectorsException, ValueError:
+        raise newException(Defect, getCurrentExceptionMsg())
 
     if fd notin loop:
       register(fd)
@@ -265,7 +271,7 @@ else:
       moment = Moment.fromNow(timeout)
       addTimer(moment, contiunuation, nil)
 
-    retFuture.cancelCallback = cancel
+    retFuture.cancelCallback = cancellation
     return retFuture
 
   proc waitReady(fd: int, timeout: var Duration): WaitResult {.inline.} =

vendor/nim-chronos

@@ -1 +1 @@
-Subproject commit c066bfcb16482d82ef5b6fdbac85ec8f7565d56c
+Subproject commit aa36b645182fe2e25d442bb5e93b0b06cff897bc