1 files changed, 27 insertions, 2 deletions
diff --git a/Source/cmUVProcessChain.cxx b/Source/cmUVProcessChain.cxx
index 655e52a..4c72261 100644
--- a/Source/cmUVProcessChain.cxx
+++ b/Source/cmUVProcessChain.cxx
@@ -38,7 +38,8 @@ struct cmUVProcessChain::InternalData
 
   bool Valid = false;
 
-  cm::uv_loop_ptr Loop;
+  cm::uv_loop_ptr BuiltinLoop;
+  uv_loop_t* Loop;
 
   StreamData InputStreamData;
   StreamData OutputStreamData;
@@ -74,6 +75,19 @@ cmUVProcessChainBuilder& cmUVProcessChainBuilder::AddCommand(
   return *this;
 }
 
+cmUVProcessChainBuilder& cmUVProcessChainBuilder::SetBuiltinLoop()
+{
+  this->Loop = nullptr;
+  return *this;
+}
+
+cmUVProcessChainBuilder& cmUVProcessChainBuilder::SetExternalLoop(
+  uv_loop_t& loop)
+{
+  this->Loop = &loop;
+  return *this;
+}
+
 cmUVProcessChainBuilder& cmUVProcessChainBuilder::SetNoStream(Stream stdio)
 {
   switch (stdio) {
@@ -135,6 +149,11 @@ cmUVProcessChainBuilder& cmUVProcessChainBuilder::SetWorkingDirectory(
   return *this;
 }
 
+uv_loop_t* cmUVProcessChainBuilder::GetLoop() const
+{
+  return this->Loop;
+}
+
 cmUVProcessChain cmUVProcessChainBuilder::Start() const
 {
   cmUVProcessChain chain;
@@ -158,6 +177,13 @@ bool cmUVProcessChain::InternalData::Prepare(
 {
   this->Builder = builder;
 
+  if (this->Builder->Loop) {
+    this->Loop = this->Builder->Loop;
+  } else {
+    this->BuiltinLoop.init();
+    this->Loop = this->BuiltinLoop;
+  }
+
   auto const& input =
     this->Builder->Stdio[cmUVProcessChainBuilder::Stream_INPUT];
   auto& inputData = this->InputStreamData;
@@ -353,7 +379,6 @@ void cmUVProcessChain::InternalData::Finish()
 cmUVProcessChain::cmUVProcessChain()
   : Data(cm::make_unique<InternalData>())
 {
-  this->Data->Loop.init();
 }
 
 cmUVProcessChain::cmUVProcessChain(cmUVProcessChain&& other) noexcept