From 33ac3085647bf71df292cb5998686d6f651d9ad7 Mon Sep 17 00:00:00 2001
From: Tony Garnock-Jones <tonyg@leastfixedpoint.com>
Date: Sun, 12 Dec 2021 23:02:51 +0100
Subject: [PATCH] Allow access to new Actor handle on spawn (is this safe?)

---
 packages/core/src/runtime/actor.ts | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/packages/core/src/runtime/actor.ts b/packages/core/src/runtime/actor.ts
index 7ca9092..d81227f 100644
--- a/packages/core/src/runtime/actor.ts
+++ b/packages/core/src/runtime/actor.ts
@@ -326,12 +326,12 @@ export class Turn {
     }
 
     // Alias for syndicatec code generator to use
-    _spawn(bootProc: LocalAction, initialAssertions = new IdentitySet<Handle>()): void {
-        this.spawn(bootProc, initialAssertions);
+    _spawn(bootProc: LocalAction, initialAssertions = new IdentitySet<Handle>()): Actor {
+        return this.spawn(bootProc, initialAssertions);
     }
 
-    spawn(bootProc: LocalAction, initialAssertions = new IdentitySet<Handle>()): void {
-        this.__spawn(bootProc, initialAssertions);
+    spawn(bootProc: LocalAction, initialAssertions = new IdentitySet<Handle>()): Actor {
+        return this.__spawn(bootProc, initialAssertions);
     }
 
     __spawn(bootProc: LocalAction, initialAssertions = new IdentitySet<Handle>()): Actor {
@@ -348,15 +348,16 @@ export class Turn {
     }
 
     // Alias for syndicatec code generator to use
-    _spawnLink(bootProc: LocalAction, initialAssertions = new IdentitySet<Handle>()): void {
-        this.spawnLink(bootProc, initialAssertions);
+    _spawnLink(bootProc: LocalAction, initialAssertions = new IdentitySet<Handle>()): Actor | null {
+        return this.spawnLink(bootProc, initialAssertions);
     }
 
-    spawnLink(bootProc: LocalAction, initialAssertions = new IdentitySet<Handle>()): void {
-        if (!this.activeFacet.isLive) return;
+    spawnLink(bootProc: LocalAction, initialAssertions = new IdentitySet<Handle>()): Actor | null {
+        if (!this.activeFacet.isLive) return null;
         const newActor = this.__spawn(bootProc, initialAssertions);
         this.activeFacet._halfLink(newActor.root);
         newActor.root._halfLink(this.activeFacet);
+        return newActor;
     }
 
     stopActor(): void {