diff --git a/_examples/cron/Makefile b/_examples/cron/Makefile
index 019492c..eaa9356 100644
--- a/_examples/cron/Makefile
+++ b/_examples/cron/Makefile
@@ -1,6 +1,6 @@
 .PHONY: dev
 dev:
-	wrangler dev
+	wrangler dev --test-scheduled
 
 .PHONY: build
 build:
diff --git a/_examples/cron/README.md b/_examples/cron/README.md
index 014e4a7..b31da2f 100644
--- a/_examples/cron/README.md
+++ b/_examples/cron/README.md
@@ -18,3 +18,12 @@ make dev     # run dev server
 make build   # build Go Wasm binary
 make deploy # deploy worker
 ```
+
+#### Testing cron schedule
+
+* With curl command below, you can test the cron schedule.
+  - see: https://developers.cloudflare.com/workers/runtime-apis/handlers/scheduled/#background
+
+```
+curl "http://localhost:8787/__scheduled?cron=*+*+*+*+*"
+```
diff --git a/_examples/cron/main.go b/_examples/cron/main.go
index 73c3ec9..61f2b08 100644
--- a/_examples/cron/main.go
+++ b/_examples/cron/main.go
@@ -3,7 +3,9 @@ package main
 import (
 	"context"
 	"fmt"
+	"time"
 
+	"github.com/syumai/workers/cloudflare"
 	"github.com/syumai/workers/cloudflare/cron"
 )
 
@@ -15,6 +17,11 @@ func task(ctx context.Context) error {
 
 	fmt.Println(e.ScheduledTime.Unix())
 
+	cloudflare.WaitUntil(func() {
+		time.Sleep(1 * time.Second)
+		fmt.Println("Run sub task after returning from main task")
+	})
+
 	return nil
 }
 
diff --git a/_examples/multiple-handlers/.gitignore b/_examples/multiple-handlers/.gitignore
new file mode 100644
index 0000000..aee7b7e
--- /dev/null
+++ b/_examples/multiple-handlers/.gitignore
@@ -0,0 +1,3 @@
+build
+node_modules
+.wrangler
diff --git a/_examples/multiple-handlers/Makefile b/_examples/multiple-handlers/Makefile
new file mode 100644
index 0000000..eaa9356
--- /dev/null
+++ b/_examples/multiple-handlers/Makefile
@@ -0,0 +1,12 @@
+.PHONY: dev
+dev:
+	wrangler dev --test-scheduled
+
+.PHONY: build
+build:
+	go run ../../cmd/workers-assets-gen
+	tinygo build -o ./build/app.wasm -target wasm -no-debug ./...
+
+.PHONY: deploy
+deploy:
+	wrangler deploy
diff --git a/_examples/multiple-handlers/README.md b/_examples/multiple-handlers/README.md
new file mode 100644
index 0000000..768d335
--- /dev/null
+++ b/_examples/multiple-handlers/README.md
@@ -0,0 +1,29 @@
+# multiple-handlers
+
+* This example shows how to use multiple handlers in a single worker.
+
+## Development
+
+### Requirements
+
+This project requires these tools to be installed globally.
+
+* wrangler
+* tinygo
+
+### Commands
+
+```
+make dev     # run dev server
+make build   # build Go Wasm binary
+make deploy # deploy worker
+```
+
+#### Testing cron schedule
+
+* With curl command below, you can test the cron schedule.
+  - see: https://developers.cloudflare.com/workers/runtime-apis/handlers/scheduled/#background
+
+```
+curl "http://localhost:8787/__scheduled?cron=*+*+*+*+*"
+```
diff --git a/_examples/multiple-handlers/go.mod b/_examples/multiple-handlers/go.mod
new file mode 100644
index 0000000..4066289
--- /dev/null
+++ b/_examples/multiple-handlers/go.mod
@@ -0,0 +1,7 @@
+module github.com/syumai/workers/_examples/multiple-handlers
+
+go 1.21.3
+
+require github.com/syumai/workers v0.0.0
+
+replace github.com/syumai/workers => ../../
diff --git a/_examples/multiple-handlers/go.sum b/_examples/multiple-handlers/go.sum
new file mode 100644
index 0000000..e69de29
diff --git a/_examples/multiple-handlers/main.go b/_examples/multiple-handlers/main.go
new file mode 100644
index 0000000..ff94f6f
--- /dev/null
+++ b/_examples/multiple-handlers/main.go
@@ -0,0 +1,38 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/syumai/workers"
+	"github.com/syumai/workers/cloudflare/cron"
+)
+
+func main() {
+	handler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		fmt.Fprint(w, "Hello, world!")
+	})
+
+	task := func(ctx context.Context) error {
+		e, err := cron.NewEvent(ctx)
+		if err != nil {
+			return err
+		}
+		fmt.Println(e.ScheduledTime.Unix())
+		return nil
+	}
+
+	// set up the worker
+	workers.ServeNonBlock(handler)
+	cron.ScheduleTaskNonBlock(task)
+
+	// send a ready signal to the runtime
+	workers.Ready()
+
+	// block until the handler or task is done
+	select {
+	case <-workers.Done():
+	case <-cron.Done():
+	}
+}
diff --git a/_examples/multiple-handlers/wrangler.toml b/_examples/multiple-handlers/wrangler.toml
new file mode 100644
index 0000000..c0dc4c1
--- /dev/null
+++ b/_examples/multiple-handlers/wrangler.toml
@@ -0,0 +1,10 @@
+name = "multiple-handlers"
+main = "./build/worker.mjs"
+compatibility_date = "2023-02-24"
+workers_dev = false
+
+[triggers]
+crons = ["* * * * *"]
+
+[build]
+command = "make build"
diff --git a/cloudflare/cron/scheduler.go b/cloudflare/cron/scheduler.go
index 1f97881..d0485f6 100644
--- a/cloudflare/cron/scheduler.go
+++ b/cloudflare/cron/scheduler.go
@@ -5,13 +5,17 @@ import (
 	"fmt"
 	"syscall/js"
 
+	"github.com/syumai/workers"
 	"github.com/syumai/workers/internal/jsutil"
 	"github.com/syumai/workers/internal/runtimecontext"
 )
 
 type Task func(ctx context.Context) error
 
-var scheduledTask Task
+var (
+	scheduledTask Task
+	doneCh        = make(chan struct{})
+)
 
 func runScheduler(eventObj js.Value) error {
 	ctx := runtimecontext.New(context.Background(), eventObj)
@@ -46,16 +50,21 @@ func init() {
 	jsutil.Binding.Set("runScheduler", runSchedulerCallback)
 }
 
-//go:wasmimport workers ready
-func ready()
-
 // ScheduleTask sets the Task to be executed
 func ScheduleTask(task Task) {
 	scheduledTask = task
-	ready()
-	select {}
+	workers.Ready()
+	<-Done()
 }
 
 // ScheduleTaskNonBlock sets the Task to be executed but does not signal readiness or block
 // indefinitely. The non-blocking form is meant to be used in conjunction with [workers.Serve].
-func ScheduleTaskNonBlock(task Task) { scheduledTask = task }
+func ScheduleTaskNonBlock(task Task) {
+	scheduledTask = task
+}
+
+// Done returns a channel which is closed when the task is done.
+// Currently, this channel is never closed to support cloudflare.WaitUntil feature.
+func Done() <-chan struct{} {
+	return doneCh
+}
diff --git a/handler.go b/handler.go
index edc3f5b..0ce5f66 100644
--- a/handler.go
+++ b/handler.go
@@ -25,3 +25,15 @@ func Serve(handler http.Handler) {
 	fmt.Fprintln(os.Stderr, "warn: this server is currently running in non-JS mode. to enable JS-related features, please use the make command in the syumai/workers template.")
 	http.ListenAndServe(addr, handler)
 }
+
+func ServeNonBlock(http.Handler) {
+	panic("ServeNonBlock is not supported in non-JS environments")
+}
+
+func Ready() {
+	panic("Ready is not supported in non-JS environments")
+}
+
+func Done() <-chan struct{} {
+	panic("Done is not supported in non-JS environments")
+}
diff --git a/handler_js.go b/handler_js.go
index ed026a3..54f1fdf 100644
--- a/handler_js.go
+++ b/handler_js.go
@@ -16,7 +16,7 @@ import (
 
 var (
 	httpHandler http.Handler
-	closeCh     = make(chan struct{})
+	doneCh      = make(chan struct{})
 )
 
 func init() {
@@ -52,7 +52,7 @@ type appCloser struct {
 }
 
 func (c *appCloser) Close() error {
-	defer close(closeCh)
+	defer close(doneCh)
 	return c.ReadCloser.Close()
 }
 
@@ -84,16 +84,32 @@ func handleRequest(reqObj js.Value) (js.Value, error) {
 	return w.ToJSResponse(), nil
 }
 
-//go:wasmimport workers ready
-func ready()
-
-// Server serves http.Handler on a JS runtime.
+// Serve serves http.Handler on a JS runtime.
 // if the given handler is nil, http.DefaultServeMux will be used.
 func Serve(handler http.Handler) {
+	ServeNonBlock(handler)
+	Ready()
+	<-Done()
+}
+
+// ServeNonBlock sets the http.Handler to be served but does not signal readiness or block
+// indefinitely. The non-blocking form is meant to be used in conjunction with Ready and WaitForCompletion.
+func ServeNonBlock(handler http.Handler) {
 	if handler == nil {
 		handler = http.DefaultServeMux
 	}
 	httpHandler = handler
+}
+
+//go:wasmimport workers ready
+func ready()
+
+// Ready must be called after all setups of the Go side's handlers are done.
+func Ready() {
 	ready()
-	<-closeCh
+}
+
+// Done returns a channel which is closed when the handler is done.
+func Done() <-chan struct{} {
+	return doneCh
 }