Bound asynchronous session work

cmd/olliesrv/internal/fs/spec.go

@@ -40,9 +40,28 @@ const (
 
 var treeSpecUID, treeSpecGID string
 
+const asyncWorkLimit = 64
+
+var asyncWorkSlots = make(chan struct{}, asyncWorkLimit)
+
+func startAsync(ctx context.Context, fn func()) bool {
+	select {
+	case asyncWorkSlots <- struct{}{}:
+	case <-ctx.Done():
+		return false
+	default:
+		return false
+	}
+	go func() {
+		defer func() { <-asyncWorkSlots }()
+		fn()
+	}()
+	return true
+}
+
 // runWorkflow executes a workflow script in the background.
 func runWorkflow(s *session.Session, workflow string) {
-	go func() {
+	startAsync(s.Ctx, func() {
 		scriptPath := util.CfgDir() + "/workflows/" + workflow
 		if _, err := os.Stat(scriptPath); err != nil {
 			s.SetGoalStatus("error: workflow not found: " + workflow)
@@ -65,7 +84,7 @@ func runWorkflow(s *session.Session, workflow string) {
 			s.SetGoalStatus("error: " + msg)
 		}
 		// Script exited — don't auto-set complete; the conductor agent handles that.
-	}()
+	})
 }
 
 // buildTreeSpec constructs the full 9P namespace.
@@ -607,10 +626,10 @@ func buildAgentChildren(a *agent.Agent, s *session.Session) []virtfs.FsNodeDecl
 					s.InvalidateModelsCache()
 					return nil
 				}
-				go func() {
+				startAsync(s.Ctx, func() {
 					a.Submit(s.Ctx, input)
 					a.EnsureTrailingNewline()
-				}()
+				})
 				return nil
 			}),
 		),
@@ -623,12 +642,14 @@ func buildAgentChildren(a *agent.Agent, s *session.Session) []virtfs.FsNodeDecl
 				a.Queue(input)
 				// If the agent is idle, trigger processing.
 				if !a.IsRunning() {
-					go func() {
+					if !startAsync(s.Ctx, func() {
 						if next, ok := a.PopQueue(); ok {
 							a.Submit(s.Ctx, next)
 							a.EnsureTrailingNewline()
 						}
-					}()
+					}) {
+						return fmt.Errorf("async work limit reached")
+					}
 				}
 				return nil
 			}),