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"DoEvents" or "wxSafeYield" equivalent in Upp++ [message #17844]

Sun, 31 August 2008 02:09

koldo
Messages: 3453
Registered: August 2008

Senior Veteran

Hello all

I would like to use some kind of "poor man" multithreading for long "for" loops. Like:

for (int i = 0; i < MANY_LOOPS; ++i) {
  ThingsToDo();
  DoEvents();
}

where DoEvents() lets some kind of "cooperative multitasking" by:
- disabling the user input to all program windows
- asking the Upp++ main loop to handle the pending messages in the windowing system
- re-enabling it again afterwards

Disabling user input would avoid unwanted reentrance of code.

In this moment this will be enough for me and much easier to handle than real multitasking with the gui.

Best regards

Best regards
Iñaki

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Re: "DoEvents" or "wxSafeYield" equivalent in Upp++ [message #17845 is a reply to message #17844]

Sun, 31 August 2008 09:17

mirek
Messages: 14271
Registered: November 2005

Ultimate Member

You should be able to do this using:

static  Vector<Ctrl *> Ctrl::GetTopCtrls();
Vector< Ptr<Ctrl> > DisableCtrls(const Vector<Ctrl *>& ctrl, Ctrl *exclude = NULL);
static  void Ctrl::ProcessEvents();
void EnableCtrls(const Vector< Ptr<Ctrl> >& ctrl);

Mirek

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Re: "DoEvents" or "wxSafeYield" equivalent in Upp++ [message #17860 is a reply to message #17845]

Sun, 31 August 2008 19:53

koldo
Messages: 3453
Registered: August 2008

Senior Veteran

Hello luzr

I have tried this, but it blocks all until the loop ends.

for (int i = 0; i < 100; ++i) {
	Sleep(500);
	Vector<Ctrl *> topCtrls = Ctrl::GetTopCtrls();
	Vector< Ptr<Ctrl> > ctrls = DisableCtrls(topCtrls);
	Ctrl::ProcessEvents();
	EnableCtrls(ctrls);
}

But this simply works perfect. (taking care of avoiding the user to run this code while it is still running).

for (int i = 0; i < 100; ++i) {
	Sleep(500);
	Ctrl::ProcessEvents();
}

Thank you!
Koldo

Best regards
Iñaki

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Re: "DoEvents" or "wxSafeYield" equivalent in Upp++ [message #17863 is a reply to message #17860]

Sun, 31 August 2008 20:33

mirek
Messages: 14271
Registered: November 2005

Ultimate Member

koldo wrote on Sun, 31 August 2008 13:53

Hello luzr

I have tried this, but it blocks all until the loop ends.

for (int i = 0; i < 100; ++i) {
	Sleep(500);
	Vector<Ctrl *> topCtrls = Ctrl::GetTopCtrls();
	Vector< Ptr<Ctrl> > ctrls = DisableCtrls(topCtrls);
	Ctrl::ProcessEvents();
	EnableCtrls(ctrls);
}

But this simply works perfect. (taking care of avoiding the user to run this code while it is still running).

for (int i = 0; i < 100; ++i) {
	Sleep(500);
	Ctrl::ProcessEvents();
}

Thank you!
Koldo

I thought that "block all" was the purpose of disabling Smile

Note that there is parameter "exclude" in DisableCtrls. Usually, you want to leave something enabled to process cancel messages, right? Smile

Mirek

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