check ole.GeMessage error.
btw. https://github.com/go-ole/go-ole/blob/master/com_func.go#L163
On Thursday, February 16, 2017 at 7:12:19 AM UTC+3, fe f wrote:
>
> I'm writing a go program that constantly receives and processes windows
> messages in golang. (Go1.7, GOMAXPROCS=8, Windows 10)
>
> Here's my code.. (minimal code)
>
> import (
> "fmt"
> "github.com/go-ole/go-ole"
> "runtime"
> )
> func main () {
> SetPriorityClass(GetCurrentProcess(), HIGH_PRIORITY_CLASS)
> runtime.LockOSThread()
>
>
> InitCOM() // Initializes COM Object
> // (The com object constantly send message to this process)
>
>
> RunTickerGoroutine()
> // This functions internally launches one goroutine,
> // which also sends message to the main thread every 30 seconds
>
>
>
>
> /* Typical Windows Message Loop */
> var m ole.Msg
> for {
> ole.GetMessage(&m, 0, 0, 0)
> fmt.Println(m, ": Got Message!")
> ole.DispatchMessage(&m)
> }
> }
>
>
> func SetPriorityClass() {
> // Just some some syscalls calling SetPriorityClass of Kernel32.dll
> ...
> }
>
>
>
> So bascially there are two objects(com object and goroutine I launched)
> which constantly send messages to the main goroutine and this main
> goroutine processes them with typical message loop.. and it works well most
> of the time.
>
> However, the problem is, sometimes the message loop is getting blocked,
> and after some amount of time, the message loop resumes and large amount of
> blocked old messages are getting pumped.
>
> I initially thought this is because of main goroutine's OS Thread
> switching.
> I thought windows message loop is not getting any message for a while
> because it's goroutine got switched to other OS Thread for a while.
>
> So I added a code runtime.LockOSThread() like above code. But the problem
> still occurred!
>
> So I thought this is probably because of OS Context Switch..
> So I added code SetPriorityClass(GetCurrentProcess(), HIGH_PRIORITY_CLASS)
> to ensure this process to be high priority in windows, and killed all of
> other cpu intensive processes.
> But the problem still occurred.
>
> I really have no idea how to solve this problem..
>
> Now I'm suspecting that runtime go scheduler is not scheduling my main
> goroutine(message loop thread) sometimes, and that's why my message loop
> get blocked for a while.
>
> However, I have no idea how to verify it and also solve it.
>
> So my question is..
>
> Why the message loop is getting blocked intermittently?
>
> How can I solve this problem? (I want my main goroutine(message loop)
> always working without OS Thread switch (never blocked))
>
> Any helps/ideas will be greatly appreciated. Thanks
>
>
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