1 files changed, 10 insertions, 0 deletions
diff --git a/lib/pure/asyncdispatch.nim b/lib/pure/asyncdispatch.nim
index 6a877be30..e48fe8d94 100644
--- a/lib/pure/asyncdispatch.nim
+++ b/lib/pure/asyncdispatch.nim
@@ -242,6 +242,11 @@ 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()
@@ -931,6 +936,11 @@ else:
     if gDisp.isNil: gDisp = newDispatcher()
     result = gDisp
 
+  proc setGlobalDispatcher*(disp: PDispatcher) =
+    if not gDisp.isNil:
+      assert gDisp.callbacks.len == 0
+    gDisp = disp
+
   proc update(fd: AsyncFD, events: set[Event]) =
     let p = getGlobalDispatcher()
     assert fd.SocketHandle in p.selector