1 files changed, 10 insertions, 0 deletions
diff --git a/lib/upcoming/asyncdispatch.nim b/lib/upcoming/asyncdispatch.nim
index 7c0497cc6..8541bf98c 100644
--- a/lib/upcoming/asyncdispatch.nim
+++ b/lib/upcoming/asyncdispatch.nim
@@ -219,6 +219,11 @@ when defined(windows) or defined(nimdoc):
     if gDisp.isNil: gDisp = newDispatcher()
     result = gDisp
 
+  proc setGlobalDispatcher*(disp: PDispatcher) =
+    if not gDisp.isNil:
+      assert gDisp.callbacks.len == 0
+    gDisp = disp
+
   proc register*(fd: AsyncFD) =
     ## Registers ``fd`` with the dispatcher.
     let p = getGlobalDispatcher()
@@ -1080,6 +1085,11 @@ else:
     if gDisp.isNil: gDisp = newDispatcher()
     result = gDisp
 
+  proc setGlobalDispatcher*(disp: PDispatcher) =
+    if not gDisp.isNil:
+      assert gDisp.callbacks.len == 0
+    gDisp = disp
+
   proc register*(fd: AsyncFD) =
     let p = getGlobalDispatcher()
     var data = newAsyncData()