wasm: remove redundant calls to setTimeout and clearTimeout

[gostls13.git] / src / syscall / js / func.go

diff --git a/src/syscall/js/func.go b/src/syscall/js/func.go
index cc9497236450bb829f90dce982b577eef9b7fd54..53a4d79a95e322a96764187687e23e0bef9ed857 100644 (file)
--- a/src/syscall/js/func.go
+++ b/src/syscall/js/func.go
@@ -60,16 +60,19 @@ func (c Func) Release() {
 }
 
 // setEventHandler is defined in the runtime package.
-func setEventHandler(fn func())
+func setEventHandler(fn func() bool)
 
 func init() {
        setEventHandler(handleEvent)
 }
 
-func handleEvent() {
+// handleEvent retrieves the pending event (window._pendingEvent) and calls the js.Func on it.
+// It returns true if an event was handled.
+func handleEvent() bool {
+       // Retrieve the event from js
        cb := jsGo.Get("_pendingEvent")
        if cb.IsNull() {
-               return
+               return false
        }
        jsGo.Set("_pendingEvent", Null())
 
@@ -77,14 +80,17 @@ func handleEvent() {
        if id == 0 { // zero indicates deadlock
                select {}
        }
+
+       // Retrieve the associated js.Func
        funcsMu.Lock()
        f, ok := funcs[id]
        funcsMu.Unlock()
        if !ok {
                Global().Get("console").Call("error", "call to released function")
-               return
+               return true
        }
 
+       // Call the js.Func with arguments
        this := cb.Get("this")
        argsObj := cb.Get("args")
        args := make([]Value, argsObj.Length())
@@ -92,5 +98,8 @@ func handleEvent() {
                args[i] = argsObj.Index(i)
        }
        result := f(this, args)
+
+       // Return the result to js
        cb.Set("result", result)
+       return true
 }